S. N. Kallaev, A. G. Bakmaev, Z. M. Omarov, K. Bormanis
{"title":"纳米结构PbFe0.5Ta0.5O3铁电陶瓷的热物理性质","authors":"S. N. Kallaev, A. G. Bakmaev, Z. M. Omarov, K. Bormanis","doi":"10.1134/S0020168525700293","DOIUrl":null,"url":null,"abstract":"<p>The thermophysical properties of the PbFe<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub> relaxor ferroelectric have been studied in the temperature range 150–800 K. We have revealed anomalies in its heat capacity, thermal diffusivity, and thermal conductivity in the region of the broad ferroelectric transition at <i>T</i><sub>C</sub> ≈ 275 K, the Burns temperature <i>T</i><sub>B</sub> ≈ 690 K, and an intermediate temperature <i>T</i>* ≈ 380 K. The anomalous behavior of heat capacity in the temperature range 200–700 K has been shown to be due to three-level states (Schottky anomaly). We have examined prevailing phonon mechanisms of heat transport in the multiferroic with a nanopolar structure. The anomalous behavior of its thermophysical properties in the temperature range <i>T</i><sub>B</sub> > <i>T</i> > <i>T</i><sub>C</sub> has been attributed to the growth and changes in the system of reorientable nanopolar regions. We have demonstrated that studies of thermophysical properties allow one to determine all characteristic temperatures of relaxor ferroelectrics, related to the formation of a nanopolar structure and its variation with temperature. The results of this study are discussed in combination with structure data.</p>","PeriodicalId":585,"journal":{"name":"Inorganic Materials","volume":"60 15","pages":"1633 - 1639"},"PeriodicalIF":0.7000,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Thermophysical Properties of PbFe0.5Ta0.5O3 Ferroelectric Ceramics with Nanopolar Structure\",\"authors\":\"S. N. Kallaev, A. G. Bakmaev, Z. M. Omarov, K. Bormanis\",\"doi\":\"10.1134/S0020168525700293\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The thermophysical properties of the PbFe<sub>0.5</sub>Ta<sub>0.5</sub>O<sub>3</sub> relaxor ferroelectric have been studied in the temperature range 150–800 K. We have revealed anomalies in its heat capacity, thermal diffusivity, and thermal conductivity in the region of the broad ferroelectric transition at <i>T</i><sub>C</sub> ≈ 275 K, the Burns temperature <i>T</i><sub>B</sub> ≈ 690 K, and an intermediate temperature <i>T</i>* ≈ 380 K. The anomalous behavior of heat capacity in the temperature range 200–700 K has been shown to be due to three-level states (Schottky anomaly). We have examined prevailing phonon mechanisms of heat transport in the multiferroic with a nanopolar structure. The anomalous behavior of its thermophysical properties in the temperature range <i>T</i><sub>B</sub> > <i>T</i> > <i>T</i><sub>C</sub> has been attributed to the growth and changes in the system of reorientable nanopolar regions. We have demonstrated that studies of thermophysical properties allow one to determine all characteristic temperatures of relaxor ferroelectrics, related to the formation of a nanopolar structure and its variation with temperature. The results of this study are discussed in combination with structure data.</p>\",\"PeriodicalId\":585,\"journal\":{\"name\":\"Inorganic Materials\",\"volume\":\"60 15\",\"pages\":\"1633 - 1639\"},\"PeriodicalIF\":0.7000,\"publicationDate\":\"2025-06-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Inorganic Materials\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0020168525700293\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Inorganic Materials","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S0020168525700293","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Thermophysical Properties of PbFe0.5Ta0.5O3 Ferroelectric Ceramics with Nanopolar Structure
The thermophysical properties of the PbFe0.5Ta0.5O3 relaxor ferroelectric have been studied in the temperature range 150–800 K. We have revealed anomalies in its heat capacity, thermal diffusivity, and thermal conductivity in the region of the broad ferroelectric transition at TC ≈ 275 K, the Burns temperature TB ≈ 690 K, and an intermediate temperature T* ≈ 380 K. The anomalous behavior of heat capacity in the temperature range 200–700 K has been shown to be due to three-level states (Schottky anomaly). We have examined prevailing phonon mechanisms of heat transport in the multiferroic with a nanopolar structure. The anomalous behavior of its thermophysical properties in the temperature range TB > T > TC has been attributed to the growth and changes in the system of reorientable nanopolar regions. We have demonstrated that studies of thermophysical properties allow one to determine all characteristic temperatures of relaxor ferroelectrics, related to the formation of a nanopolar structure and its variation with temperature. The results of this study are discussed in combination with structure data.
期刊介绍：
Inorganic Materials is a journal that publishes reviews and original articles devoted to chemistry, physics, and applications of various inorganic materials including high-purity substances and materials. The journal discusses phase equilibria, including P–T–X diagrams, and the fundamentals of inorganic materials science, which determines preparatory conditions for compounds of various compositions with specified deviations from stoichiometry. Inorganic Materials is a multidisciplinary journal covering all classes of inorganic materials. The journal welcomes manuscripts from all countries in the English or Russian language.
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