Crystal structure and microwave dielectric properties of LaLuO3 ceramics

VARGHESE, Jobin, JOSEPH, Tony, SEBASTIAN, Mailadil Thomas, REEVES-MCLAREN, Nik and FETEIRA, Antonio (2010). Crystal structure and microwave dielectric properties of LaLuO3 ceramics. Journal of the American Ceramic Society, 93 (10), 2960-2963.

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Abstract

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) Å, b=8.37489 (12) Å, and c=5.81841 (8) Å, Z=4]. This space group assignment was further corroborated by Raman spectroscopy analysis. At RT and MW frequencies, LaLuO3 ceramics sintered at 1525°C/4 h exhibit a relative permittivity, ɛr=22.4, a quality factor, Qu×f=14 400 GHz (at 5.14 GHz), and temperature coefficient of resonant frequency, τf=−7.5 ppm/°C. ɛr corrected for porosity was calculated as 23.9.

Item Type:	Article
Research Institute, Centre or Group:	Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Corrosion Technology
Identification Number:	10.1111/j.1551-2916.2010.03930.x
Depositing User:	Hilary Ridgway
Date Deposited:	06 Jun 2012 10:52
Last Modified:	06 Jun 2012 10:52
URI:	http://shura.shu.ac.uk/id/eprint/5316

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