K. A. Verkhovskaya, M. A. Pankova, I. I. Popov, L. N. Korotkov
{"title":"铁电相变附近 VDF60/Tr40 共聚物的线性和非线性介电响应","authors":"K. A. Verkhovskaya, M. A. Pankova, I. I. Popov, L. N. Korotkov","doi":"10.1134/S1063774524602260","DOIUrl":null,"url":null,"abstract":"<p>The effect of the bias electric field <i>E</i><sub>=</sub> (0–10 kV/cm) on the dielectric properties of the VDF<sub>60</sub>/Tr<sub>40</sub> copolymer was studied in the temperature range of 20–110°C. It was found that the dielectric nonlinearity Δε is negative in the polar phase and becomes positive above the Curie temperature (<i>T</i><sub>C</sub>). The increase in <i>T</i><sub>C</sub> under the field <i>E</i><sub>=</sub> is not uniform. At <i>E</i><sub>=</sub> < <i>E</i><sub><i>c</i></sub> (<i>E</i><sub><i>c</i></sub> is the threshold field), the Curie temperature is practically independent of <i>E</i><sub>=</sub>. At <i>E</i><sub>=</sub> > <i>E</i><sub><i>c</i></sub>, an increase in <i>T</i><sub>C</sub> is observed. The presence of the threshold field indicates the existence of sources of random electric fields in the material under study. It is suggested that they are responsible for the smearing of the ferroelectric phase transition.</p>","PeriodicalId":527,"journal":{"name":"Crystallography Reports","volume":"69 6","pages":"886 - 891"},"PeriodicalIF":0.6000,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Linear and Nonlinear Dielectric Response of VDF60/Tr40 Copolymer in the Vicinity of Ferroelectric Phase Transition\",\"authors\":\"K. A. Verkhovskaya, M. A. Pankova, I. I. Popov, L. N. Korotkov\",\"doi\":\"10.1134/S1063774524602260\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The effect of the bias electric field <i>E</i><sub>=</sub> (0–10 kV/cm) on the dielectric properties of the VDF<sub>60</sub>/Tr<sub>40</sub> copolymer was studied in the temperature range of 20–110°C. It was found that the dielectric nonlinearity Δε is negative in the polar phase and becomes positive above the Curie temperature (<i>T</i><sub>C</sub>). The increase in <i>T</i><sub>C</sub> under the field <i>E</i><sub>=</sub> is not uniform. At <i>E</i><sub>=</sub> < <i>E</i><sub><i>c</i></sub> (<i>E</i><sub><i>c</i></sub> is the threshold field), the Curie temperature is practically independent of <i>E</i><sub>=</sub>. At <i>E</i><sub>=</sub> > <i>E</i><sub><i>c</i></sub>, an increase in <i>T</i><sub>C</sub> is observed. The presence of the threshold field indicates the existence of sources of random electric fields in the material under study. It is suggested that they are responsible for the smearing of the ferroelectric phase transition.</p>\",\"PeriodicalId\":527,\"journal\":{\"name\":\"Crystallography Reports\",\"volume\":\"69 6\",\"pages\":\"886 - 891\"},\"PeriodicalIF\":0.6000,\"publicationDate\":\"2025-02-16\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Crystallography Reports\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S1063774524602260\",\"RegionNum\":4,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q4\",\"JCRName\":\"CRYSTALLOGRAPHY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Crystallography Reports","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1134/S1063774524602260","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CRYSTALLOGRAPHY","Score":null,"Total":0}
Linear and Nonlinear Dielectric Response of VDF60/Tr40 Copolymer in the Vicinity of Ferroelectric Phase Transition
The effect of the bias electric field E= (0–10 kV/cm) on the dielectric properties of the VDF60/Tr40 copolymer was studied in the temperature range of 20–110°C. It was found that the dielectric nonlinearity Δε is negative in the polar phase and becomes positive above the Curie temperature (TC). The increase in TC under the field E= is not uniform. At E= < Ec (Ec is the threshold field), the Curie temperature is practically independent of E=. At E= > Ec, an increase in TC is observed. The presence of the threshold field indicates the existence of sources of random electric fields in the material under study. It is suggested that they are responsible for the smearing of the ferroelectric phase transition.
期刊介绍：
Crystallography Reports is a journal that publishes original articles short communications, and reviews on various aspects of crystallography: diffraction and scattering of X-rays, electrons, and neutrons, determination of crystal structure of inorganic and organic substances, including proteins and other biological substances; UV-VIS and IR spectroscopy; growth, imperfect structure and physical properties of crystals; thin films, liquid crystals, nanomaterials, partially disordered systems, and the methods of studies.
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