Crystal Structure and Microwave Dielectric Properties of LaLuO3 Ceramics

被引：20

作者：

Varghese, Jobin ^{[1
]}

Joseph, Tony ^{[1
]}

Sebastian, Mailadil Thomas ^{[1
]}

Reeves-McLaren, Nik ^{[2
]}

Feteira, Antonio ^{[3
]}

机构：

[1] Natl Inst Interdisciplinary Sci & Technol CSIR, Mat & Minerals Div, Trivandrum 695019, Kerala, India

[2] Univ Sheffield, Dept Mat Engn, Sheffield S1 3JD, S Yorkshire, England

[3] Univ Birmingham, Sch Chem, Birmingham B15 2TT, W Midlands, England

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2010年 / 93卷 / 10期

关键词：

COMPLEX PERMITTIVITY;

D O I：

10.1111/j.1551-2916.2010.03930.x

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：

Dense LaLuO3 ceramics were prepared by the conventional solid-state reaction route. Their room-temperature (RT) crystal structure and microwave (MW) dielectric properties were investigated. Rietveld refinements performed on X-ray diffraction data show the RT crystal symmetry to be best described by the centrosymmetric orthorhombic Pnma space group [a=6.01888 (9) A, b=8.37489 (12) A, and c=5.81841 (8) A, Z=4]. This space group assignment was further corroborated by Raman spectroscopy analysis. At RT and MW frequencies, LaLuO3 ceramics sintered at 1525 degrees C/4 h exhibit a relative permittivity, epsilon(r)=22.4, a quality factor, Q(u) x f=14 400 GHz (at 5.14 GHz), and temperature coefficient of resonant frequency, tau(f)=-7.5 ppm/degrees C. epsilon(r) corrected for porosity was calculated as 23.9.

引用

页码：2960 / 2963

页数：4

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