Specific features of phase transitions and the conduction of La{sub 2}Mo{sub 2}O{sub 9} oxide-ion conducting compound doped with vanadium
Journal Article
·
· Crystallography Reports
- Moscow State University, Faculty of Physics (Russian Federation)
The X-ray powder analysis, calorimetric studies, and conductivity measurements of a series of ceramic La{sub 2}Mo{sub 2-x}V{sub x}O{sub y} specimens with different vanadium content are performed with the aim of following the dynamics of phase formation of the low-temperature {alpha}, high-temperature {beta}, and metastable {beta}{sub ms} phases. At x {>=} 0.06, the cubic phase becomes stable and the monoclinic phase vanishes; therefore, the main {alpha} {sup {yields}} {beta} transition is suppressed. According to the data of differential thermal analyses, a weak thermal anomaly is observed in the range 450-470{sup o}C at x {>=} 0.06. This anomaly is indicative of the {beta}{sub ms} {sup {yields}} {beta} transition due to the conversion of the cubic phase with statically disordered oxygen atoms into the cubic phase with dynamic disorder. The conductivity of the high-temperature {beta} phase obeys the Vogel-Tammann-Fulcher law.
- OSTI ID:
- 22051219
- Journal Information:
- Crystallography Reports, Journal Name: Crystallography Reports Journal Issue: 2 Vol. 55; ISSN 1063-7745; ISSN CYSTE3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis and phase transitions of oxide-ion conducting compound La{sub 2}Mo{sub 2}O{sub 9} doped with alkaline metals
Dielectric relaxation and phase transitions at cryogenic temperatures in 0.65[Pb(Ni{sub 1/3}Nb{sub 2/3})O{sub 3}]-0.35PbTiO{sub 3} ceramics
Heterogeneous nature of relaxation dynamics of room-temperature ionic liquids (EMIm)2[Co(NCS)4] and (BMIm)2[Co(NCS)4]
Journal Article
·
Tue Mar 15 00:00:00 EDT 2011
· Crystallography Reports
·
OSTI ID:22054299
Dielectric relaxation and phase transitions at cryogenic temperatures in 0.65[Pb(Ni{sub 1/3}Nb{sub 2/3})O{sub 3}]-0.35PbTiO{sub 3} ceramics
Journal Article
·
Wed Aug 01 00:00:00 EDT 2007
· Physical Review. B, Condensed Matter and Materials Physics
·
OSTI ID:21055094
Heterogeneous nature of relaxation dynamics of room-temperature ionic liquids (EMIm)2[Co(NCS)4] and (BMIm)2[Co(NCS)4]
Journal Article
·
Tue Aug 11 00:00:00 EDT 2015
· Journal of Physical Chemistry. C
·
OSTI ID:1342696