{"title":"Temperature dependent dielectric mechanism of lead-free double perovskite Sr2YbNbO6","authors":"Arpita Barua, Sanjoy Kumar Dey, Sanjay Kumar","doi":"10.1007/s10832-024-00354-0","DOIUrl":null,"url":null,"abstract":"<p>The double perovskite Sr<sub>2</sub>YbNbO<sub>6</sub> (Strontium ytterbium niobium oxide, SYN) has been synthesized by solid-state ceramic processing technique. SYN crystallizes in monoclinic structure with <i>P</i>2<sub>1</sub><i>/n</i> space group. SYN is polycrystalline in nature with grain size ~ 2.38 μm. The Raman spectrum analysis of SYN reveals the presence of 24 Raman active modes. The bands associated with the bending and stretching vibrations of the YbO<sub>6</sub> and NbO<sub>6</sub> octahedra has been analysed using its FTIR spectrum. The optical band gap of SYN has been obtained to be 3.08 eV. The dielectric properties of the sample have been investigated in between 50 Hz to 1 MHz frequency and 303‒513 K temperature. The dielectric relaxation of SYN is polydispersive in nature and has been analysed using the Cole-Cole model. The activation energy of SYN is 0.52 eV which points towards the conduction associated with the hopping of p-type polaron.</p>","PeriodicalId":625,"journal":{"name":"Journal of Electroceramics","volume":"70 1","pages":""},"PeriodicalIF":1.7000,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Electroceramics","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s10832-024-00354-0","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, CERAMICS","Score":null,"Total":0}
引用次数: 0
Abstract
The double perovskite Sr2YbNbO6 (Strontium ytterbium niobium oxide, SYN) has been synthesized by solid-state ceramic processing technique. SYN crystallizes in monoclinic structure with P21/n space group. SYN is polycrystalline in nature with grain size ~ 2.38 μm. The Raman spectrum analysis of SYN reveals the presence of 24 Raman active modes. The bands associated with the bending and stretching vibrations of the YbO6 and NbO6 octahedra has been analysed using its FTIR spectrum. The optical band gap of SYN has been obtained to be 3.08 eV. The dielectric properties of the sample have been investigated in between 50 Hz to 1 MHz frequency and 303‒513 K temperature. The dielectric relaxation of SYN is polydispersive in nature and has been analysed using the Cole-Cole model. The activation energy of SYN is 0.52 eV which points towards the conduction associated with the hopping of p-type polaron.
期刊介绍：
While ceramics have traditionally been admired for their mechanical, chemical and thermal stability, their unique electrical, optical and magnetic properties have become of increasing importance in many key technologies including communications, energy conversion and storage, electronics and automation. Electroceramics benefit greatly from their versatility in properties including:
-insulating to metallic and fast ion conductivity
-piezo-, ferro-, and pyro-electricity
-electro- and nonlinear optical properties
-feromagnetism.
When combined with thermal, mechanical, and chemical stability, these properties often render them the materials of choice.
The Journal of Electroceramics is dedicated to providing a forum of discussion cutting across issues in electrical, optical, and magnetic ceramics. Driven by the need for miniaturization, cost, and enhanced functionality, the field of electroceramics is growing rapidly in many new directions. The Journal encourages discussions of resultant trends concerning silicon-electroceramic integration, nanotechnology, ceramic-polymer composites, grain boundary and defect engineering, etc.
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