Premium
Role of Niobium in Magnesium Titanate Microwave Dielectric Ceramics
Author(s) -
Ferreira Victor M.,
Baptista João L.
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08787.x
Subject(s) - niobium , materials science , microstructure , ceramic , dielectric , doping , microwave , permittivity , mineralogy , analytical chemistry (journal) , phase (matter) , electroceramics , composite material , metallurgy , optoelectronics , chemistry , telecommunications , fabrication , organic chemistry , chromatography , medicine , microfabrication , alternative medicine , pathology , computer science
The effect of niobium doping on MgTiO 3 ceramics was evaluated in terms of microstructure and microwave dielectric properties. Pure and doped MgTiO 3 dense ceramics were produced. Doping levels of niobium were 0.5,1, and 2 at.% of Nb 5+ . Phase assemblages were examined by XRD and checked by EDS during microstructural observations by SEM. Microwave dielectric properties were measured at 8 GHz. Dielectric permittivity was not much affected by doping. Q decreased for the sample with the higher Nb content because of the presence of a second phase. For low Nb contents, a solid solution was formed and Q even increased. An explanation is presented based on the elimination of lattice defects.