Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 26, Issue 10-11, Pages 2051-2054Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2005.09.058
Keywords
microwave processing; sintering; dielectric properties; substrates; tungstate
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The microwave dielectric characteristics of AWO(4) (A = Mg, Zn, Mn, Ca, Sr, Ba) compounds and their relations with structure have been investigated as a function of A cations. Crystal structure was investigated by XRD; the structure changed from wolframite to scheelite with increasing size of A cation. Dielectric properties such as permittivity, temperature coefficient of resonant frequency (tau(f)), and quality factors (Q x f) were found to be correlated with the size of A cations and the structure of compounds. Permittivity decreased with the size of A cations, and temperature coefficient of resonant frequency was correlated with unit cell volume. AWO(4) compounds are suitable for the applications of low-k dielectric materials; permittivity = 8-15, tau(f) = -50 to -70, and Q x f = 60,000-70,000. (c) 2005 Elsevier Ltd. All rights reserved.
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