Effect of isovalent substitution on microstructure and phase transition of LaNb1−xMxO4 (M=Sb, V or Ta; x=0.05–0.3)
PBN-AR
Instytucja
Wydział Fizyki Technicznej i Matematyki Stosowanej (Politechnika Gdańska)
Informacje podstawowe
Główny język publikacji
ENG
Czasopismo
JOURNAL OF SOLID STATE CHEMISTRY
ISSN
0022-4596
EISSN
Wydawca
DOI
URL
Rok publikacji
2014
Numer zeszytu
Strony od-do
201-209
Numer tomu
219
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
LANTHANUM NIOBATE
PHASE TRANSITION
THERMAL EXPANSION COEFFICIENT
Streszczenia
Język
Treść
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.
Inne
System-identifier
128477