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Thermodynamic properties of titanates, zirconates and hafnates of alkaline earth metals

Journal Article:

Abstract

The problems are considered arising in critical analysis and choosing recommended values of thermodynamic constants of the series of the most important perovskites-ferroelectrics-titanates, zirconates, and hafnates of alkaline-earth metals finding application in modern radioelectronics. Recommended values of standard thermodynamic values are given: heat capacity Csub(p,298) , enthalpy change H/sub 298/-H/sub 0/, entropy S/sub 298/, heat formation ..delta..Hsub(f,298 ), free energy formation ..delta..Gsub(f,298) , temperatures and heats of phase transitions with indication of errors for the adopted values. The effect of impurities on thermal constants of phase transitions is discussed. The relationships between thermodynamic characteristics of perovskites and crystal structure as well as the effect of orthorhombic distortions of ideal perovskite lattice on entropy of the compounds have been considered. Along with thermodynamic methods of investigation, a great attention is given to other physical methods which have been used for finding temperature regions of phase transitions, Curie points, and temperatures of transition from ferroelectric to paraelectric state. The importance of physical methods is emphasized in those cases when phase transitions are accompanied by small energy changes and are not fixed in measuring heat capacity.
Authors:
Publication Date:
Feb 01, 1978
Product Type:
Journal Article
Reference Number:
AIX-09-410581; EDB-79-013345
Resource Relation:
Journal Name: Usp. Khim.; (USSR); Journal Volume: 47:2
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ALKALINE EARTH METAL COMPOUNDS; THERMODYNAMIC PROPERTIES; HAFNATES; TITANATES; ZIRCONATES; CRYSTAL STRUCTURE; CURIE POINT; ENTROPY; FORMATION FREE ENTHALPY; FORMATION HEAT; IMPURITIES; PHASE TRANSFORMATIONS; REVIEWS; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; THERMODYNAMICS; DOCUMENT TYPES; ENERGY; ENTHALPY; FREE ENTHALPY; HAFNIUM COMPOUNDS; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REACTION HEAT; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION TEMPERATURE; ZIRCONIUM COMPOUNDS; 400201* - Chemical & Physicochemical Properties
OSTI ID:
6598660
Country of Origin:
USSR
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: USKHA
Submitting Site:
INIS
Size:
Pages: 177-211
Announcement Date:
Nov 01, 1978

Journal Article:

Citation Formats

Not Available. Thermodynamic properties of titanates, zirconates and hafnates of alkaline earth metals. USSR: N. p., 1978. Web.
Not Available. Thermodynamic properties of titanates, zirconates and hafnates of alkaline earth metals. USSR.
Not Available. 1978. "Thermodynamic properties of titanates, zirconates and hafnates of alkaline earth metals." USSR.
@misc{etde_6598660,
title = {Thermodynamic properties of titanates, zirconates and hafnates of alkaline earth metals}
author = {Not Available}
abstractNote = {The problems are considered arising in critical analysis and choosing recommended values of thermodynamic constants of the series of the most important perovskites-ferroelectrics-titanates, zirconates, and hafnates of alkaline-earth metals finding application in modern radioelectronics. Recommended values of standard thermodynamic values are given: heat capacity Csub(p,298) , enthalpy change H/sub 298/-H/sub 0/, entropy S/sub 298/, heat formation ..delta..Hsub(f,298 ), free energy formation ..delta..Gsub(f,298) , temperatures and heats of phase transitions with indication of errors for the adopted values. The effect of impurities on thermal constants of phase transitions is discussed. The relationships between thermodynamic characteristics of perovskites and crystal structure as well as the effect of orthorhombic distortions of ideal perovskite lattice on entropy of the compounds have been considered. Along with thermodynamic methods of investigation, a great attention is given to other physical methods which have been used for finding temperature regions of phase transitions, Curie points, and temperatures of transition from ferroelectric to paraelectric state. The importance of physical methods is emphasized in those cases when phase transitions are accompanied by small energy changes and are not fixed in measuring heat capacity.}
journal = {Usp. Khim.; (USSR)}
volume = {47:2}
journal type = {AC}
place = {USSR}
year = {1978}
month = {Feb}
}