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Preparation and characterization of (V1−x Al x )2O3 nano-grain ceramics by chemical doping route
- Source :
-
Materials Research Bulletin . Dec2010, Vol. 45 Issue 12, p2031-2035. 5p. - Publication Year :
- 2010
-
Abstract
- Abstract: (V1−x Al x )2O3 nano-grain ceramics have been prepared successfully for the first time by sintering (V1−x Al x )2O3 nano-powders obtained from a chemical doping route under a H2 atmosphere at 1373–1623K for 15–60min. The SEM micrographs show that the nano-powders obtained by pyrolyzing Al-doped precursors in H2 at 723–823K are more suitable as precursors for ceramics. The AFM micrographs show that the obtained ceramics have a hierarchical structure: the agglomerates in ceramics are about 1–2μm in size, and the agglomerates are composed of spherical particles with diameters of about 30–40nm. The result of resistivity measurement of (V1−x Al x )2O3 nano-grain ceramics confirms that the nano-crystal boundaries in ceramics not only could eliminate effectively the thermo-stress during preparation process but also may be a good electric conductor. The nano-grain ceramics have low room temperature resistivity and exhibit good PTC property. The magnetic susceptibility result of the ceramics also exhibits the intrinsic phase transition property. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00255408
- Volume :
- 45
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Materials Research Bulletin
- Publication Type :
- Academic Journal
- Accession number :
- 55394423
- Full Text :
- https://doi.org/10.1016/j.materresbull.2010.09.011