Phenomenological Theory of Successive Phase Transitions in Mixed Perovskite-Type Oxides
نویسندگان
چکیده
منابع مشابه
Prediction of Formability in Perovskite-Type Oxides
Abstract: Prediction criterions for the formabilities of perovskite-type oxides are obtained by using the empirical structure map methods constructed by two parameters octahedral factor (rB/rO) and tolerance factor, on this structure map, simple point representing systems of forming and non forming are distributed in distinctively different regions. In this paper we found that the octahedral fa...
متن کاملAuto - combustion synthesis of perovskite - type oxides
A versatile one-pot auto-combustion method for the synthesis of powders of iron-doped strontium titanate, SrTi1-xFexO3-δ, has been developed. The synthesis is optimised by the combined use of EDTA and citric acid as chelating agents, and an appropriate balance between fuel and oxidising elements in the reaction mixture. The method produces immediately an almost phase-pure perovskite oxide powde...
متن کاملIonic Mobility and Phase Transitions in Perovskite Oxides for Energy Applications
Perovskite oxides find applications or are studied in many fields related to energy production, accumulation and saving. The most obvious application is oxygen or proton conductors in fuel cells (SOFCs), but the (anti)ferroelectric compositions may find application in high energy capacitors for energy storage, efficient electrocaloric cooling, and electromechanical energy harvesting. In SOFCs, ...
متن کاملTransmission electron microscopy and structural phase transitions in anion-deficient perovskite-based oxides.
This review deals with the structural transitions arising in anion-deficient Mn- and Cu-based perovskites when changing the anion content. Special attention is devoted to the local structure of such materials, studied with electron diffraction and high-resolution electron microscopy. Using examples of three-dimensional or layered manganites and cuprates, it is shown that oxidation/reduction rea...
متن کاملPhenomenological theories of ferroelectric phase transitions
parameter in the free energy expansion, phenomenological theory can also describe inhomogeneous structures appearPhenomenological theories for ferroelectrics are based ing in the ferroelectric phase transition, such as twins, on L andau–Devonshire type models, which can be conantiphase structures and domain walls. Here two examples structed based on thermodynamic principles and symwill be used ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1980
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp.64.380