Correlation of microwave dielectric properties and normal vibration modes of xBaMg1Õ3Ta2Õ3O3– 1ÀxBaMg1Õ3Nb2Õ3O3 ceramics: I. Raman spectroscopy

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Title:	Correlation of microwave dielectric properties and normal vibration modes of xBaMg1Õ3Ta2Õ3O3– 1ÀxBaMg1Õ3Nb2Õ3O3 ceramics: I. Raman spectroscopy
Authors:	Chia, Chih-Ta;Chen, Yi-Chun;Cheng, Hsiu-Fung;林諭男;Lin, I-Nan
Contributors:	淡江大學物理學系
Date:	2003-09-01
Issue Date:	2009-12-31 10:20:42 (UTC+8)
Publisher:	College Park: American Institute of Physics (AIP)
Abstract:	Micro-Raman measurements of xBa~Mg1/3Ta2/3)O3–(12x)Ba~Mg1/3Nb2/3)O3 perovskite ceramics, with x50, 0.25, 0.50, 0.75, and 1.0, were taken at room temperature. Raman results clearly show the 1:2 ordered structures of these compounds. Four A1g and ﬁve Eg Raman modes were unambiguously assigned. The A1g(O) phonon of the oxygen-octahedron stretch mode, which possesses the largest energy and width of all the observed Raman phonons, signiﬁcantly inﬂuences the microwave dielectric properties of the materials. A higher vibration frequency of A1g(O) mode results in a lower dielectric constant, and a wider width of the mode corresponds to a lower Q3f value.
Relation:	Journal of Applied Physics 94(5), pp.3360-3364
DOI:	10.1063/1.1597968
Appears in Collections:	[Graduate Institute & Department of Physics] Journal Article

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