The sintering behavior and microwave dielectric properties of (1-x)Cu3Nb2O8-xZn3Nb2O 8 have been investigated using dilatometry, x-ray diffraction, and a network analyzer. It was found that (1-x)Cu3Nb2O8-xZn3Nb2O 8 ceramics have a much lower melting temperature than Zn3Nb2O8 ceramics without Cu3Nb2O8 additives. Samples sintered at 900 °C for 2 h exhibited densities >97% of the theoretical density. Cu3Nb2O8 acts as a sintering aid. Two phase regions were identified with increasing Zn3Nb2O8 contents. A Cu3Nb2O8-Zn3Nb2O8 solid solution exists from 0 < x < 0.5 while a mixture of Cu3Nb2O8 and Zn3Nb2O8 exists from 0.5 < x < 1. The microwave dielectric properties correlated to the crystal structure. In Cu3Nb2O8-Zn3Nb2O8 solid solution region, the variation of dielectric properties could be explained by the structure distortion of Cu3Nb2O8 due to electronic anisotropies of Cu2+ cations.
|Number of pages||6|
|Journal||Journal of Materials Research|
|Publication status||Published - 2001 May 1|
ASJC Scopus subject areas
- Materials Science(all)