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Crystal structure of corundum type Mg4(Nb2– xTax)O9microwave dielectric ceramics with low dielectric loss

Authors
Journal
Journal of the European Ceramic Society
0955-2219
Publisher
Elsevier
Publication Date
Volume
23
Issue
14
Identifiers
DOI: 10.1016/s0955-2219(03)00167-5
Keywords
  • Dielectric Properties
  • Niobates
  • Tantalates
  • X-Ray Methods
  • Mg4(Nb
  • Ta)2O9
  • Microwave Ceramics

Abstract

Abstract New microwave dielectric ceramics, i.e. Mg 4(Nb 2− x Ta x )O 9 (MNT) solid solutions, were synthesized and their microwave dielectric properties and crystal structure were investigated in this study. From the discrete variational Xα (DV-Xα) method, it was found that the Ta–O bonds in the TaO 6 octahedron become more covalent than Nb–O bonds in the NbO 6 octahedron; this result leads to the decrease of the ionicity in the Ta 5+ ion. The dielectric constants of MNT were slightly decreased from 12.4 to 11.5; this result might be due to the covalent interaction of Ta–O bonding. The quality factors of the samples were found to exhibit high value ( Q· f≒350 000 GHz for x=2) which is comparable to those of Al 2O 3.

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