10 results on '"thermal expansion coefficient"'
Search Results
2. Thermal expansion of (MnIn2S4)1-x•(AgIn5S8)x solid solutions
- Author
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Chan Bin Tkhan and I. V. Bodnar
- Subjects
single crystals ,crystal structure ,unit cell parameter ,thermal expansion coefficient ,debye temperature ,Electronics ,TK7800-8360 - Abstract
The thermal expansion of single crystals of solid solutions (MnIn2S4)1–х•(AgIn5S8)х was measured by the dilatometric method in the temperature range 80–450 K. The coefficients of thermal expansion are determined and their concentration dependences at different temperatures are constructed. It is established that the indicated quantities with composition x vary linearly. From the obtained values of the coefficients of thermal expansion, the Debye temperatures and the mean-square dynamic displacements of the atoms are calculated. It is shown that as the temperature is raised, the Debye temperature decreases, and the mean square dynamic displacements of the atoms increase.
- Published
- 2019
3. THERMOELECTRIC COOLING MODULE WITH DAMPING CONDUCTOR ON COLD SPAYS
- Author
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A. A. Kasyanov, K. L. Samusevich, and G. N. Isachenko
- Subjects
thermoelectricity ,thermoelectric module ,silicides ,electrically conductive silicone ,thermal expansion coefficient ,Optics. Light ,QC350-467 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
Subject of Research.The paper presents results of study on a thermoelectric cooling module with damping heat and electrically conductive material for cold junctions. Telluride obtained by synthesis in a melting furnace is used as a thermoelectric element material. The size of a thermoelectric element is 2.0×2.0×1.5 mm. The modules were mounted on ceramic plates made of 96% Al2O3 with dimensions of 30×30×0.89 mm. Copper coated with a layer of nickel is used as the switching bus material. Modules were attached to the board by soldering. Tin and bismuth solder paste (melting point is equal to 139°С) was used as an assembly solder alloy. An electrically conductive EX-A302L silicone with specific resistance of 0.02 Ohm/cm, densityof 3.7 g/cm3 and thermal conductivity of 2.1 W/(m·K) was used for the damping compound. Methods. For efficiency increase of a thermal contact of a thermoelectric module, associated with large temperature gradient between hot and cold energy, especially for electrical n-elements, it is recommended to use an elastic electrically conductive adhesive. Elastic conductive adhesive based on silicone is proposed. Conductive silicone EX-A302L adhesive sealant consisted of single-component cold-vulcanized silicone with splashes of conductive microgranules. Working temperature from -50 to +120°C allows for the application of this adhesive both for conventional refrigeration modules, and for the cold junction of medium-temperature modules. A phased module assembly technology is developed. Main Results. Comparative tests are carried out for the experimental thermoelectric module and the standard industrial module of TB-31-2.0-1.5 thermoelectric module at measuring installations manufactured by Kryotherm company. The integrity of the modules was tested on Testo thermal imager. It is established that the difference between the working characteristics of experimental and industrial modules does not exceed 10% and lies within the permissible limits. It is found out that destruction dynamics of the modules after temperature cycling is virtually the same. Practical Relevance. The results obtained demonstrate the application possibility of electrically conductive adhesive as a contact layer for a thermoelement. The proposed technology will allow for replacing the materials of thermoelectric module branches with more efficient ones, but having different coefficients of temperature expansion, thereby increasing the efficiency of the thermoelectric device.
- Published
- 2019
- Full Text
- View/download PDF
4. Phase Equilibrium, Crystal Structure and Properties of Intermediate Oxides in the Pr2O3-SrO-CoO System
- Author
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Vlasova, M. A., Maklakova, A. V., and Volkova, N. E.
- Subjects
КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ ,КОЭФФИЦИЕНТ ЗЕЕБЕКА ,OXYGEN NON-STOICHIOMETRY ,КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА ,ЭЛЕКТРОПРОВОДНОСТЬ ,THERMAL EXPANSION COEFFICIENT ,PHYSICO-CHEMICAL PROPERTIES ,ФИЗИКО-ХИМИЧЕСКИЕ СВОЙСТВА ,КОЭФФИЦИЕНТ ТЕРМИЧЕСКОГО РАСШИРЕНИЯ ,CRYSTAL STRUCTURE ,ELECTRICAL CONDUCTIVITY ,THERMOPOWER - Abstract
Данная работа посвящена изучению кристаллической структуры и кислородной нестехиометрии сложных оксидов в системе Pr2O3-SrO-CoO. Была исследована температурная зависимость кристаллической структуры сложного оксида, что ранее не встречалось в литературе. Также были исследованы термические свойства и электропроводность сложных оксидов, образующихся в данной системе, в интервале температур 25 – 1100 °С. This work is devoted to the study of the crystal structure and oxygen nonstoichiometry of complex oxides in the Pr2O3-SrO-CoO system. The temperature dependence of the crystal structure of a complex oxide was investigated, which was not previously found in the literature. The thermal properties and electrical conductivity of complex oxides formed in this system were also investigated in the temperature range of 25 – 1100 В°C.
- Published
- 2022
5. НАУЧНО-ТЕХНОЛОГИЧЕСКИЕ ОСНОВЫ СОЗДАНИЯ ЭЖЕКТОРНЫХ ТЕПЛООБМЕННИКОВ И ИХ ПРИМЕНЕНИЕ В РАЗЛИЧНЫХ СИСТЕМАХ
- Author
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Когут, В. Е.
- Abstract
Copyright of Refrigeration Engineering & Technology is the property of Odesa National University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2016
- Full Text
- View/download PDF
6. Influence of Nano-Adhesion for Elasticity Modulus of Polymer Nanocomposites
- Author
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A.I. Burya, Z.Kh. Afshagova, G.V. Kozlov, and Yu.S. Lipatov
- Subjects
nano-adhesion effect ,disperse-filled polymer nanocomposites ,thermal expansion coefficient ,Mechanical engineering and machinery ,TJ1-1570 - Abstract
There has been shown the existence of nano-adhesion effect in the disperse-filled polymer nanocomposites, which significantly influences the decrease of thermal expansion coefficient and the increase of elasticity modulus. The degree of nanocomposites' reinforcement has been stated to be influenced by the properties of polymer matrix, nanofiller and the degree of interphase adhesion.
- Published
- 2008
7. Phase Equilibria in the Dy2o3 – Bao – Fe2o3 System and Properties of Compounds Based on Formed Phases
- Author
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Bastron, I. A. and Volkova, N. E.
- Subjects
КИСЛОРОДНАЯ НЕСТЕХИОМЕТРИЯ ,PHASE EQUILIBRIA ,ЭЛЕКТРОПРОВОДНОСТЬ ,OXYGEN NONSTOICHIOMETRY ,THERMAL EXPANSION COEFFICIENT ,MAGNETIC PROPERTIES ,COMPLEX OXIDE COMPOUNDS ,КОЭФФИЦИЕНТ ТЕРМИЧЕСКОГО РАСШИРЕНИЯ ,ELECTRICAL CONDUCTIVITY ,ФАЗОВЫЕ РАВНОВЕСИЯ ,РЕНТГЕНОФАЗОВЫЙ АНАЛИЗ ,МАГНИТНЫЕ СВОЙСТВА ,X-RAY PHASE ANALYSIS ,СЛОЖНОКСИДНЫЕ СОЕДИНЕНИЯ - Abstract
Объектом исследования являются сложные оксиды, образующихся в системе ½ Dy2O3 – BaO – ½ Fe2O3 и производные, полученные на их основе. В работе был проведен синтез сложных оксидов, рентгенофазовый анализ всех синтезированных образцов. Зависимость кислородной нестехиометрии от температуры была изучена методами йодометрического титрования и высокотемпературной термогравиметрии. Для кобальт-замещенного сложного оксида было изучено линейное термическое расширение, общая электропроводность и магнитные свойства. Предложен изобарно-изотермический разрез фазовой диаграммы ½ Dy2O3 – BaO – ½ Fe2O3 при 1100 °С на воздухе. The object of the study is the complex oxides formed in the ½ Dy2O3– BaO – ½ Fe2O3 system and the samples obtained based on these phases. Synthesis of complex oxides and X-ray analysis of all synthesized samples has been performed. The changes of oxygen content in the solid solutions were measured by thermogravimetric analysis and iodometric titration as a function of temperature. Thermal expansion, total electrical conductivity, and magnetic properties were studied for the cobalt substituted complex oxide. A subsolidus isothermal isobaric phase diagram (1100 °C, in air) for the ½ Dy2O3 – BaO – ½ Fe2O3 system has been constructed.
- Published
- 2021
8. Structure and Electric Conductivity of Zirconate Barium BaZr1-XYXO3-δ
- Author
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Zakiryanov, P. O. and Ivanov, I. L.
- Subjects
PROTON CONDUCTOR ,ПРОТОННЫЙ ПРОВОДНИК ,ДОПИРОВАННЫЙ ЦИРКОНАТ БАРИЯ ,ACTIVATION ENERGY ,ПАРЦИАЛЬНАЯ ПРОВОДИМОСТЬ ,DOPED BARIUM ZIRCONATE ,THERMAL EXPANSION COEFFICIENT ,PARTIAL CONDUCTIVITY ,ЭНЕРГИЯ АКТИВАЦИИ ,КОЭФФИЦИЕНТ ТЕРМИЧЕСКОГО РАСШИРЕНИЯ - Abstract
Данная работа посвящена исследованию структурных и электротранспортных свойств цирконата бария, допированного иттрием, являющегося перспективным протон-проводящим электролитом. Методом пиролиза полимерно-солевых композиций синтезированы образцыBaZr1-xYxO3-δ(x = 0,1; 0,2; 0,5), установлены изменение параметров кристаллической решетки в диапазоне температур от 25 до 1100 ℃, рассчитаны энергии активации парциальных проводимостей при различных значениях температуры (от 790 до 1040 ℃) в широком диапазоне парциального давления водяного пара(lg(pH2O/атм.) = от -4; до -1,7) и содержания кислорода (lg(pO2/атм.) = от -20; до -0,68) в атмосфере над образцом. This work is devoted to the study of the structural and electrical transport properties of yttrium-doped barium zirconate, which is a promising proton-conducting electrolyte. By the method of pyrolysis of polymer-salt compositions powder samples of BaZr1-xYxO3-δ (x = 0.1; 0.2; 0.5) were synthesized. The crystal lattice parameters in the temperature range from 25 to 1100 ℃ was determined. The activation energies of partial conductivities were calculated at different temperature values (from 790 to 1040 ℃) in a wide range of partial pressure of water vapor (log (pH2O / atm.) = from -4; to -1.7) and oxygen content (log (pO2 / atm.) = from -20; to -0.68) in the atmosphere above the sample.
- Published
- 2021
9. Physicochemical properties of the complex oxides in Sm-Ba-Me-Cu-O (Me = Fe, Co) systems
- Author
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Volkova, N. E., Deryabina, K. M., Gavrilova, L. Ya., Cherepanov, V. A., РФФИ грант № 13-03-00958, and Министерство образования и науки РФ, федеральная целевая программа «Научные и научно-педагогические кадры инновационной России» на 2009-2013 годы»
- Subjects
layered perovskites compounds ,thermal expansion coefficient ,thermogravimetry and iodometric titration ,слоистые перовскитоподобные соединения ,термогравиметрические исследования ,коэффициенты термического расширения - Abstract
The present work was focused on the studies of crystal structure, oxygen nonstoichiometry, thermal expansion of SmBaCo2−xCuxO6-δ and SmBaFe2−xCuxO6-δ. Values of the oxygen content in complex oxides SmBaCo2‑xCuxО6‑δ were determined over a wide temperature range in air using high temperature thermogravimetry and iodometric titration. Also, chemical stability with respect to Ce0.8Sm0.2O1.9 and Zr0.85Y0.15O1.93 two common solid electrolyte materials used for SOFCs was evaluated., Определены области гомогенности твердых растворов SmBaFe2-xCuxО6-δ (0.7 x 1.3) и SmBaCo2-xCuxО6-δ (0 x 1.2) на воздухе и изучена их кристаллическая структура. Построены зависимости параметров элементарных ячеек от состава и уточнены координаты позиций атомов. Методами высокотемпературной термогравиметрии и йодометрического титрования определены значения содержания кислорода в сложных оксидах SmBaCo2-xCuxО6-δ в широком интервале температур на воздухе. Рассчитаны коэффициенты термического расширения (КТР) твердых растворов SmBaCo2-xCuxО6-δ (x = 0; 0.4; 0.6) при Po2 = 0.21 атм. Исследована химическая совместимость оксидов SmBaCo2-xMexO5+d (Me=Fe, Ni, Cu) с материалом твердого электролита (Ce0.8Sm0.2O2-δ и Zr0.85Y0.15O2-δ) при 900 T,°C 1100.
- Published
- 2013
10. Cristal-chemical description of the thermal expansion of maganese pyrovanadate β-Mn2V2O7
- Author
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Chvanova, A. N., Krasnenko, T. I., Petrova, S. A., Rotermel, M. V., Zakharov, R. G., and Viktorov, V. V.
- Subjects
poliherdal representation of crystalline structure ,coorddination polyhedron ,manganese pyrovanadate ,thermal expansion coefficient ,коэффициент термического расширения ,полиэдрическое представление кристаллической структуры ,thermal deformation tensor ,термическое расширение ,координационный полиэдр ,УДК 544 ,тензор термических деформаций ,пированадат марганца ,thermal expansion - Abstract
Челябинский государственный педагогический университет. Институт химии твердого тела УрО РАН, г. Екатеринбург
- Published
- 2008
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