Raman study of antiferroelectric instability in double perovskites
- 16 October 2001
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 64 (17), 174305
- https://doi.org/10.1103/physrevb.64.174305
Abstract
A Raman study of the double-perovskite system is presented. The in-plane vibration of Ti cations shows a soft-mode behavior on lowering the temperature, though the softening ceases below 60 K. The freezing-in of the atomic displacements involved would result in an antiferroelectric order, but the tendency to instability is suppressed by structural disorder arising from lithium doping and incomplete cation ordering in the A site of the perovskite.
This publication has 28 references indexed in Scilit:
- Origin of Constant Loss in Ionic ConductorsPhysical Review Letters, 2001
- Microstructural development of the La0.5Li0.5TiO3 lithium ion conductor processed by the laser floating zone (LFZ) methodJournal of Materials Chemistry, 2000
- Influence of composition on the structure and conductivity of the fast ionic conductors La2/3−xLi3xTiO3 (0.03≤x≤0.167)Solid State Ionics, 2000
- Li Mobility in the Orthorhombic Li0.18La0.61TiO3 Perovskite Studied by NMR and Impedance SpectroscopiesChemistry of Materials, 2000
- Non-Arrhenius conductivity in the fast ionic conductorReconciling spin-lattice and electrical-conductivity relaxationsPhysical Review B, 1997
- Metal-insulator transitions in La1-xTiO3, 0.0 .ltoreq. x .ltoreq. 0.33. structure-property correlationsChemistry of Materials, 1994
- SrTi: An intrinsic quantum paraelectric below 4 KPhysical Review B, 1979
- X-ray study of the deficient perovskite La23TiO3Materials Research Bulletin, 1974
- Anharmonic Effects in KTa: Ferroelectric Mode, Thermal Expansion,and CompressibilityPhysical Review B, 1973
- Pressure and Temperature Dependence of the Static Dielectric Constants and Raman Spectra of Ti(Rutile)Physical Review B, 1973