Correlation between vibrational modes and dielectric properties in (Ca1-3xBi2xΦx)MoO4 ceramics

被引：20

作者：

Guo, Jing ^{[1
,2
,3
]}

Randall, Clive A. ^{[3
]}

Zhou, Di ^{[1
,2
]}

Zhang, Gaoqun ^{[1
,2
]}

Zhang, Caihong ^{[4
]}

Jin, Biaobing ^{[4
]}

Wang, Hong ^{[1
,2
]}

机构：

[1] Xi An Jiao Tong Univ, Minist Educ, Key Lab, Elect Mat Res Lab, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[3] Penn State Univ, Mat Res Inst, Ctr Dielect & Piezoelect, University Pk, PA 16802 USA

[4] Nanjing Univ, Sch Elect Sci & Engn, RISE, Nanjing 210093, Jiangsu, Peoples R China

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2015年 / 35卷 / 16期

基金：

美国国家科学基金会;

关键词：

Microwave dielectric ceramics; Infrared reflectivity; Raman; RAMAN-SPECTRA; PHONON MODES; SCHEELITE; CAWO4; OXIDE; MOLYBDATES; OXIDATION; TUNGSTATE; CATALYSTS; CRYSTALS;

D O I：

10.1016/j.jeurceramsoc.2015.08.020

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The Raman, infrared reflectivity and terahertz spectra of A-site deficient scheelite materials (Ca1-3xBi2x Phi(x))MoO4 (Phi: A-site vacancy) were studied to evaluate the correlation between the vibrational modes and the dielectric properties. The Raman spectra were fitted with the Lorentzian model and the changes of resonance frequencies and full width at half maximum of the resonance were discussed. With the substitution of Bi into the A site of CaMoO4, the associated ionic compensation produces an increase in disorder which can contribute to an increase in dielectric losses. The harmonic oscillator model was used to fit infrared reflectivity spectra and the obtained complex dielectric response was extrapolated down into the terahertz and microwave region. The contributions of each mode to the microwave dielectric properties were investigated. It was found that the modes at low frequencies which are related to AO(8) polyhedra play the most important role in the microwave dielectric properties of (Ca1-3xBi2x Phi(x))MoO4. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：4459 / 4464

页数：6

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