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Synthesis and sintering of LaPO4 powder and its application
- Source :
-
Materials Chemistry & Physics . Mar2003, Vol. 79 Issue 1, p30. 7p. - Publication Year :
- 2003
-
Abstract
- Lanthanum phosphate powders were synthesized by direct solid–liquid reaction of lanthanum oxide and phosphoric acid at the La:P ratio of 1:1. Phase-pure and fine grain size LaPO4 powders could be obtained by calcining the as-received powders at the temperature higher than 600 °C. It was demonstrated that the phase type, grain size and morphology of the LaPO4 powders were calcined at various temperatures. We have studied the microstructure of sintered LaPO4 ceramic and Al2O3/LaPO4 composite using the synthesized powders by SEM and TEM analysis. An interesting layered crystal structure and lots of dislocations inside LaPO4 grains and at the interface of Al2O3/LaPO4 composite were observed. Low hardness and multiple dislocations and dislocation networks indicated the layered LaPO4 ceramic could possess excellent machinability. As an example for engineering application, machinable Al2O3/LaPO4 composite with weak bonding was fabricated and characterized. [Copyright &y& Elsevier]
- Subjects :
- *LANTHANUM compounds
*PHOSPHORIC acid
Subjects
Details
- Language :
- English
- ISSN :
- 02540584
- Volume :
- 79
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Materials Chemistry & Physics
- Publication Type :
- Academic Journal
- Accession number :
- 8668133
- Full Text :
- https://doi.org/10.1016/S0254-0584(02)00420-0