12 results on '"P2O5"'
Search Results
2. Ab-initio phonon calculation for P2O5 / Fdd2 (43) / materials id 2452
- Author
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0000-0001-8393-9766, Atsushi Togo, 0000-0001-8393-9766, and Atsushi Togo
- Published
- 2023
3. Optimization of the nucleating agent content for the obtaining of transparent fluormica glass-ceramics
- Author
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Consejo Superior de Investigaciones Científicas (España), Ariane, Khalissa, Tamayo Hernando, Aitana, Chorfa, Abdellah, Rubio Alonso, Fausto, Rubio Alonso, Juan, Consejo Superior de Investigaciones Científicas (España), Ariane, Khalissa, Tamayo Hernando, Aitana, Chorfa, Abdellah, Rubio Alonso, Fausto, and Rubio Alonso, Juan
- Abstract
[EN] The crystallization behaviours, mechanical and optical properties of fluormica glass-ceramic system without and with P2O5 as nucleating agent are studied. The crystallization mechanism of fluor-phlogopite (KMg3(Si3AlO10)F2) without P2O5 oxide represented one-dimensional surface crystallization with a fixed number of nuclei, and with the addition of P2O5, the mechanism tends to two-dimensional bulk crystallization with a constant nucleation rate being the most predominant phase, forsterite crystals (Mg2SiO4). The base glasses had the spinodal phase separation, which coarsened considerably by increasing P2O5 content. P2O5 had a strong influence on the microstructure and morphology of this type of glass-ceramic. The addition of small amount of P2O5 (1.0 mol%) to these glass-ceramic changed the microstructure from dendritic growth having leaf-like feature to a flower-like morphology of the crystal phase. Glass-ceramic without P2O5 produces yellowish to colourless transparent glass-ceramic, and with the incorporation of the P2O5 (1.0 mol%), which has been found the optimum to obtain transparent glass-ceramics, the transmittance is still about 85%. As the P2O5 content increased to 3.0 mol%, besides fluor-phlogopite mica, forsterite also precipitates, the size of the crystals increase, their distributions turned to be broad due to the change of the crystallization mechanism and the transparency of glass-ceramic consequently decreases.
- Published
- 2023
4. Lithium dendritic growth inhibitor enabling high capacity, dendrite-free, and high current operation for rechargeable lithium batteries
- Author
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Kim, Hee Jae, Umirov, Nurzhan, Park, Jae-Sang, Lim, Jae-Hong, Zhu, Jiefang, Kim, Sung-Soo, Myung, Seung-Taek, Kim, Hee Jae, Umirov, Nurzhan, Park, Jae-Sang, Lim, Jae-Hong, Zhu, Jiefang, Kim, Sung-Soo, and Myung, Seung-Taek
- Abstract
There is no doubt that lithium-metal batteries (LMBs) are considered as attractive power sources owing to their ex-traordinarily high energy density. However, the formation of lithium dendrites during repeated plating/stripping processes hinders their practical application. Herein, we introduce phosphorous pentoxide (P2O5) as an addi-tive to commercial carbonate-based electrolytes to effectively suppress the dendritic growth on the surface of a lithium-metal anode. Significant improvement of the lifespan and coulombic efficiency of the cell were observed with the addition of P2O5 to the electrolyte in Li || Li, Li || Type 316L SS, Li || Cu, and Li || graphite cells. According to surface analyses and microscopic studies, we found reduction mechanism of the P2O5-induced solid-electrolyte interphase (SEI) formation on Li metal. Namely, electrolytic decomposition product, LiF, reacts with P2O5 addi-tive in electrolyte, so that LiPO2F2 is produced by following reaction: 6LiF + 2P(2)O(5) ->& nbsp;3LiPO(2)F(2) + Li3PO4, of which those products suppress dendritic growth of lithium as visualized by operando Synchrotron tomography. The compatibility and outstanding rate performance of the additive-based electrolyte were also demonstrated in Li || NCM full cells. As a result, this finding confirms an effective way to stabilize SEI layers in LMBs via a facile and inexpensive route.
- Published
- 2022
- Full Text
- View/download PDF
5. Solubility Study and purification Of Industrial triple superphosphate in aqueous solution
- Author
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Nasri, Khouloud, Chtara, Chaker, Chekir, Hassen, EL Feki, Hafed, Nasri, Khouloud, Chtara, Chaker, Chekir, Hassen, and EL Feki, Hafed
- Abstract
Triple Superphosphate (TSP) is a chemical fertilizer, acknowledged by its important content of phosphorus, necessary element for plants. It’s obtained by adding phosphoric acid to phosphate ore, consisting of calcium phosphate containing many impurities. TSP was dissolved at different temperatures and in various amounts of water, filtered to remove insoluble compounds. Then the ionic conductivity was monitored for each solution as a function of the added amount of TSP. Aqueous solutions were evaporated to dryness and analyzed the P2O5. The starting materials and final products were analyzed by several methods (XRD, IR, NMR, SEM) confirming that after dissolution the product was purified.
- Published
- 2013
6. Solubility Study and purification Of Industrial triple superphosphate in aqueous solution
- Author
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Nasri, Khouloud, Chtara, Chaker, Chekir, Hassen, EL Feki, Hafed, Nasri, Khouloud, Chtara, Chaker, Chekir, Hassen, and EL Feki, Hafed
- Abstract
Triple Superphosphate (TSP) is a chemical fertilizer, acknowledged by its important content of phosphorus, necessary element for plants. It’s obtained by adding phosphoric acid to phosphate ore, consisting of calcium phosphate containing many impurities. TSP was dissolved at different temperatures and in various amounts of water, filtered to remove insoluble compounds. Then the ionic conductivity was monitored for each solution as a function of the added amount of TSP. Aqueous solutions were evaporated to dryness and analyzed the P2O5. The starting materials and final products were analyzed by several methods (XRD, IR, NMR, SEM) confirming that after dissolution the product was purified.
- Published
- 2013
7. Distribution of phosphorus and oxygen between liquid steel and basic oxygen steelmaking slag
- Author
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Basu, Somnath, Lahiri, Ashok Kumar, Seetharaman, Seshadri, Basu, Somnath, Lahiri, Ashok Kumar, and Seetharaman, Seshadri
- Abstract
The efficiency of dephosphorisation is governed by the thermodynamic behaviour of phosphorus and oxygen in molten metal, and P2O5 and FeO in slag. The equilibrium distribution of phosphorus and oxygen, for a wide range of chemical compositions simulating the evolution of slag composition during a typical BOF blow, has been experimentally determined. A mathematical model for estimation of the activity coefficients, as a function of the chemical composition, was also attempted., QC 20100525
- Published
- 2009
- Full Text
- View/download PDF
8. De milieu-effecten van de Integrale Aanpak Mestproblematiek (IAM)
- Author
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LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, Tol S van, LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, and Tol S van
- Abstract
RIVM rapport:Voor de emissies van de Nederlandse lanbouw in de periode 1997-2030 worden de schattingen gepresenteerd die worden verwacht bij uitvoering van de meest recente voorstellen voor het mestbeleid. Deze emissieschattingen zijn gebruikt als input voor berekeningen van veranderingen in de milieukwaliteit. De resultaten zijn in 2000 gerapporteerd in de vijfde Nationale Milieuverkenning 2000-2030, welke weer diende als input voor het vierde Nationale Milieubeleidsplan dat in juni 2001 werd gepubliceerd. Er wordt een methode bescreven die is gebruikt om schattingen te maken van de manier waarop boeren zullen reageren op het voorgestelde beleid en de gevolgen daarvan op de omvang van de veestapel, de mestproductie, het gebruik van mest en de regionale verdeling ervan en de daaruit resulterende emissies naar de bodem (van stikstof en fosfaat) en naar de lucht (van ammoniak). Vanaf 2002 mogen veehouders alleen vee houden voor zover kan worden aangetoond dat de verwachte mestproductie kan worden afgezet binnen de gebruiksnormen uit de EU-nitraatrichtlijn. Daartoe moeten veehouders zelf over voldoende grond beschikken of (aanvullend) contracten afsluiten voor de afzet van mest. De tweede hoeksteen van het nieuwe mestbeleid is een stelsel van nationale verliesnormen voor stikstof en fosfaat, aangevuld met regulerende heffingen., This report presents estimated levels of emissions over the period 1997 - 2030 from Dutch agriculture responding to the latest policy proposals to abate the manure problem. These emission estimates were used as input for calculation of environmental quality developments. The results were reported in the fifth National Environmental Outlook 2000-2030, which was published in 2000 and served as the scientific basis for the fourth National Environmental Policy Plan, developed by the Dutch government and published in June 2001. This report describes the method used to estimate farmers' response to the policy proposals, the subsequent impact on animal numbers, manure production, manure application and regional distribution and resulting emissions to soil (of nitrogen and phosphate) and air (of ammonia). Starting in 2002 farmers may only raise animals when they can guarantee the disposal of the expected manure production within the boundaries set by the EU nitrate direc-tive. This can either be done by having sufficient land at one's disposal or by fixing manure disposal contracts with other land owners. The second corner-stone of the manure policy is a set of national emission standards for nitrogen and phosphate, accompanied by levies. Emissions (or losses) are established per farm on a per hectare basis using a bookkeeping system, accounting for all commercial input (except phosphate chemical fertilizers) and output of nutrients.
- Published
- 2002
9. De milieu-effecten van de Integrale Aanpak Mestproblematiek (IAM)
- Author
-
LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, Tol S van, LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, and Tol S van
- Abstract
Voor de emissies van de Nederlandse lanbouw in de periode 1997-2030 worden de schattingen gepresenteerd die worden verwacht bij uitvoering van de meest recente voorstellen voor het mestbeleid. Deze emissieschattingen zijn gebruikt als input voor berekeningen van veranderingen in de milieukwaliteit. De resultaten zijn in 2000 gerapporteerd in de vijfde Nationale Milieuverkenning 2000-2030, welke weer diende als input voor het vierde Nationale Milieubeleidsplan dat in juni 2001 werd gepubliceerd. Er wordt een methode bescreven die is gebruikt om schattingen te maken van de manier waarop boeren zullen reageren op het voorgestelde beleid en de gevolgen daarvan op de omvang van de veestapel, de mestproductie, het gebruik van mest en de regionale verdeling ervan en de daaruit resulterende emissies naar de bodem (van stikstof en fosfaat) en naar de lucht (van ammoniak). Vanaf 2002 mogen veehouders alleen vee houden voor zover kan worden aangetoond dat de verwachte mestproductie kan worden afgezet binnen de gebruiksnormen uit de EU-nitraatrichtlijn. Daartoe moeten veehouders zelf over voldoende grond beschikken of (aanvullend) contracten afsluiten voor de afzet van mest. De tweede hoeksteen van het nieuwe mestbeleid is een stelsel van nationale verliesnormen voor stikstof en fosfaat, aangevuld met regulerende heffingen., This report presents estimated levels of emissions over the period 1997 - 2030 from Dutch agriculture responding to the latest policy proposals to abate the manure problem. These emission estimates were used as input for calculation of environmental quality developments. The results were reported in the fifth National Environmental Outlook 2000-2030, which was published in 2000 and served as the scientific basis for the fourth National Environmental Policy Plan, developed by the Dutch government and published in June 2001. This report describes the method used to estimate farmers' response to the policy proposals, the subsequent impact on animal numbers, manure production, manure application and regional distribution and resulting emissions to soil (of nitrogen and phosphate) and air (of ammonia). Starting in 2002 farmers may only raise animals when they can guarantee the disposal of the expected manure production within the boundaries set by the EU nitrate direc-tive. This can either be done by having sufficient land at one's disposal or by fixing manure disposal contracts with other land owners. The second corner-stone of the manure policy is a set of national emission standards for nitrogen and phosphate, accompanied by levies. Emissions (or losses) are established per farm on a per hectare basis using a bookkeeping system, accounting for all commercial input (except phosphate chemical fertilizers) and output of nutrients.
- Published
- 2002
10. De milieu-effecten van de Integrale Aanpak Mestproblematiek (IAM)
- Author
-
LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, Tol S van, LAE, Egmond PM van, Hoogervorst NJP, Born GJ van den, Hage B, and Tol S van
- Abstract
RIVM rapport:Voor de emissies van de Nederlandse lanbouw in de periode 1997-2030 worden de schattingen gepresenteerd die worden verwacht bij uitvoering van de meest recente voorstellen voor het mestbeleid. Deze emissieschattingen zijn gebruikt als input voor berekeningen van veranderingen in de milieukwaliteit. De resultaten zijn in 2000 gerapporteerd in de vijfde Nationale Milieuverkenning 2000-2030, welke weer diende als input voor het vierde Nationale Milieubeleidsplan dat in juni 2001 werd gepubliceerd. Er wordt een methode bescreven die is gebruikt om schattingen te maken van de manier waarop boeren zullen reageren op het voorgestelde beleid en de gevolgen daarvan op de omvang van de veestapel, de mestproductie, het gebruik van mest en de regionale verdeling ervan en de daaruit resulterende emissies naar de bodem (van stikstof en fosfaat) en naar de lucht (van ammoniak). Vanaf 2002 mogen veehouders alleen vee houden voor zover kan worden aangetoond dat de verwachte mestproductie kan worden afgezet binnen de gebruiksnormen uit de EU-nitraatrichtlijn. Daartoe moeten veehouders zelf over voldoende grond beschikken of (aanvullend) contracten afsluiten voor de afzet van mest. De tweede hoeksteen van het nieuwe mestbeleid is een stelsel van nationale verliesnormen voor stikstof en fosfaat, aangevuld met regulerende heffingen., This report presents estimated levels of emissions over the period 1997 - 2030 from Dutch agriculture responding to the latest policy proposals to abate the manure problem. These emission estimates were used as input for calculation of environmental quality developments. The results were reported in the fifth National Environmental Outlook 2000-2030, which was published in 2000 and served as the scientific basis for the fourth National Environmental Policy Plan, developed by the Dutch government and published in June 2001. This report describes the method used to estimate farmers' response to the policy proposals, the subsequent impact on animal numbers, manure production, manure application and regional distribution and resulting emissions to soil (of nitrogen and phosphate) and air (of ammonia). Starting in 2002 farmers may only raise animals when they can guarantee the disposal of the expected manure production within the boundaries set by the EU nitrate direc-tive. This can either be done by having sufficient land at one's disposal or by fixing manure disposal contracts with other land owners. The second corner-stone of the manure policy is a set of national emission standards for nitrogen and phosphate, accompanied by levies. Emissions (or losses) are established per farm on a per hectare basis using a bookkeeping system, accounting for all commercial input (except phosphate chemical fertilizers) and output of nutrients.
- Published
- 2002
11. De milieu-effecten van de Integrale Aanpak Mestproblematiek (IAM)
- Author
-
LAE, van Egmond, PM, Hoogervorst, NJP, van den Born, GJ, Hage, B, van Tol, S, LAE, van Egmond, PM, Hoogervorst, NJP, van den Born, GJ, Hage, B, and van Tol, S
- Abstract
RIVM rapport:Voor de emissies van de Nederlandse lanbouw in de periode 1997-2030 worden de schattingen gepresenteerd die worden verwacht bij uitvoering van de meest recente voorstellen voor het mestbeleid. Deze emissieschattingen zijn gebruikt als input voor berekeningen van veranderingen in de milieukwaliteit. De resultaten zijn in 2000 gerapporteerd in de vijfde Nationale Milieuverkenning 2000-2030, welke weer diende als input voor het vierde Nationale Milieubeleidsplan dat in juni 2001 werd gepubliceerd. Er wordt een methode bescreven die is gebruikt om schattingen te maken van de manier waarop boeren zullen reageren op het voorgestelde beleid en de gevolgen daarvan op de omvang van de veestapel, de mestproductie, het gebruik van mest en de regionale verdeling ervan en de daaruit resulterende emissies naar de bodem (van stikstof en fosfaat) en naar de lucht (van ammoniak). Vanaf 2002 mogen veehouders alleen vee houden voor zover kan worden aangetoond dat de verwachte mestproductie kan worden afgezet binnen de gebruiksnormen uit de EU-nitraatrichtlijn. Daartoe moeten veehouders zelf over voldoende grond beschikken of (aanvullend) contracten afsluiten voor de afzet van mest. De tweede hoeksteen van het nieuwe mestbeleid is een stelsel van nationale verliesnormen voor stikstof en fosfaat, aangevuld met regulerende heffingen., This report presents estimated levels of emissions over the period 1997 - 2030 from Dutch agriculture responding to the latest policy proposals to abate the manure problem. These emission estimates were used as input for calculation of environmental quality developments. The results were reported in the fifth National Environmental Outlook 2000-2030, which was published in 2000 and served as the scientific basis for the fourth National Environmental Policy Plan, developed by the Dutch government and published in June 2001. This report describes the method used to estimate farmers' response to the policy proposals, the subsequent impact on animal numbers, manure production, manure application and regional distribution and resulting emissions to soil (of nitrogen and phosphate) and air (of ammonia). Starting in 2002 farmers may only raise animals when they can guarantee the disposal of the expected manure production within the boundaries set by the EU nitrate direc-tive. This can either be done by having sufficient land at one's disposal or by fixing manure disposal contracts with other land owners. The second corner-stone of the manure policy is a set of national emission standards for nitrogen and phosphate, accompanied by levies. Emissions (or losses) are established per farm on a per hectare basis using a bookkeeping system, accounting for all commercial input (except phosphate chemical fertilizers) and output of nutrients.
- Published
- 2002
12. Étude de mise en valeur des rejets de carbonate-apatite de la mine Niobec dans le but d'une utilisation comme engrais en agriculture
- Author
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Savard, Jean Y and Savard, Jean Y
- Abstract
La mine Niobec de St-Honoré rejette en moyenne 99,5% de l'ensemble du matériel extrait par voie souterraine de son gisement de niobium et, de ce total, 20 à 25% forme le concentré de carbonates. Ce résidu qui découle de la première étape de traitement du minerai niobifère contient en moyenne 9% de P205, 38% de Ca0 et 14% de Mg0. De plus, le concentré de carbonates affiche des teneurs en P205 variant de 20 à 24% pour tout le domaine des particules de dimension supérieure à 200 mailles (74 microns). Dans le but de concentrer 1'apatite contenue dans ce rejet de carbonates, diverses méthodes ont été essayées. Un cyclonage double effectué sur le concentré de carbonates a donné une sous-verse finale dosant un peu plus de 20% P205. D'autres essais ont été tentés sur une table à secousses (en utilisant le concentré de carbonates deschlammé) et ont produit un concentré titrant 28% P205 avec une très faible récupération. Enfin, un procédé de flottation inversée a permis au Centre de Recherches Minérales du Québec d'obtenir un concentré d'apatite de 34% P205, combiné à une récupération réelle de 37,5% par rapport aux résidus totaux. D'autre part, le rejet total deschlammé qui constitue de 80 à 85% des résidus de la mine, renferme en moyenne 12% d'apatite. L'application d'une méthode de flottation directe sur ce minéral, développée par la mine Jacupiranga (Brésil), a débouché sur la production de concentrés titrant jusqu'à 37% P205 avec une récupération globale de 42,5%. Ce procédé utilise l'effet déprimant sur la gangue carbonatée d'un mélange d'amidon et de Na0H et flotte 1'apatite à l'aide d'un acide gras. L'apatite contenue dans ces divers produits fut soumise à des essais de solubilité en laboratoire et sur le terrain. Les résultats enregistrés ont démontré le faible taux de solubilité de la fluorapatite (Ca5 (P04) 3F) de la mine Niobec de St-Honorê. Par ailleurs, à la lumière des données recueillies, le traitement des rejets de carbonate-apatite de Niobec pourrait conduir
- Published
- 1981
- Full Text
- View/download PDF
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