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两性 Sm 和价态可变 Cr 共掺杂的细晶 BaTiO 陶瓷的介电和光致发光特性

Dielectric and photoluminescence properties of fine-grained BaTiO ceramics co-doped with amphoteric Sm and valence-variable Cr.

作者信息

Han Dandan, Lu Dayong, Meng Fanling

机构信息

Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University Changchun 130012 China

Research Center for Materials Science and Engineering, Jilin Institute of Chemical Technology Jilin 132022 P. R. China

出版信息

RSC Adv. 2019 Feb 5;9(8):4469-4479. doi: 10.1039/c8ra09326a. eCollection 2019 Jan 30.

DOI:10.1039/c8ra09326a
PMID:35520157
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9060627/
Abstract

(Ba Sm )(Ti Cr )O (BSTC) and (Ba Sm )(TiCr )O (BSTC1) ceramics with a single-phase perovskite structure were prepared using a traditional solid state based method. The structure, microstructure, site occupations, valence states of Cr, photoluminescence, and dielectric properties of these ceramics were investigated using XRD, SEM, EDXS, RS, EPR, XPS, and dielectric measurements. All ceramics exhibit a fine-grained microstructure (0.7 μm). Three valence states of Cr ions were confirmed and Cr predominates as Cr enter the Ti sites with a stronger EPR signal (1.974). The RS bands of high-wavenumber were attributed to photoluminescence from Sm ions. The formation of defect complexes play leading roles in the removal of prevent the grain growth, and photoluminescence quenching. (Ba Sm )(TiCr )O (BSTC1) ceramics with amphoteric Sm ions exhibit a regular diffuse phase transition behavior, rapid -shifting rate of -24.3 °C/at% (Sm/Cr), higher lower tan  and = 0.04 and 0.05 met the EIA Y5V specification.

摘要

采用传统的基于固态的方法制备了具有单相钙钛矿结构的（Ba Sm ）（Ti Cr ）O （BSTC）和（Ba Sm ）（Ti Cr ）O （BSTC1）陶瓷。使用XRD、SEM、EDXS、RS、EPR、XPS和介电测量等方法研究了这些陶瓷的结构、微观结构、占位、Cr的价态、光致发光和介电性能。所有陶瓷均呈现细晶微观结构（0.7μm）。确认了Cr离子的三种价态，并且随着Cr以更强的EPR信号（1.974）进入Ti位点，Cr占主导地位。高波数的RS带归因于Sm离子的光致发光。缺陷复合体的形成在阻止晶粒生长和光致发光猝灭中起主导作用。具有两性Sm离子的（Ba Sm ）（Ti Cr ）O （BSTC1）陶瓷呈现出规则的弥散相变行为，-24.3°C/at%（Sm/Cr）的快速温度漂移率，更低的损耗正切tanδ且ε = 0.04和0.05满足EIA Y5V规范。

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