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Effect of isovalent substitution on microstructure and phase transition of LaNb1−xMxO4 (M=Sb, V or Ta; x=0.05–0.3)
Abstract
LaNb1−xMxO4 oxides with pentavalent elements of different ionic sizes (M=Sb, Ta and V, x=0.05–0.3) were synthesized by the solid state reaction method. Special interest was devoted to the antimony substituted lanthanum niobate which is a new material in this group. Rietveld analysis of the X-ray diffraction patterns was used to determine the influence of the material composition on unit cell parameters. On the basis of dilatometric measurements phase transition temperatures and thermal expansion coefficients of the studied materials were determined. It was shown that with increasing concentration of Sb the phase transition temperature decreases. Thermal expansion coefficient of the antimony substituted samples above the transition temperature is in the range from 8.1 to 9.1×10−6 1/K, whereas below the transition temperature the TEC value is between 14 and 17.3×10−6 1/K. Influence of Ta, V and Sb substitutions on the microstructure and grain size was studied.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
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JOURNAL OF SOLID STATE CHEMISTRY
no. 219,
pages 201 - 209,
ISSN: 0022-4596 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Wachowski S., Mielewczyk-Gryń A., Gazda M.: Effect of isovalent substitution on microstructure and phase transition of LaNb1−xMxO4 (M=Sb, V or Ta; x=0.05–0.3)// JOURNAL OF SOLID STATE CHEMISTRY. -Vol. 219, (2014), s.201-209
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.jssc.2014.07.041
- Verified by:
- Gdańsk University of Technology
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