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Phase Relation and Microwave Dielectric Properties of (Zn 1− x Co x )Ta 2 O 6 System
Author(s) -
Huang ChengLiang,
Chen JhihYong
Publication year - 2010
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.1551-2916.2009.03546.x
Subject(s) - dielectric , microwave , ceramic , materials science , phase (matter) , analytical chemistry (journal) , dielectric loss , mineralogy , chemistry , metallurgy , telecommunications , optoelectronics , organic chemistry , chromatography , computer science
High‐dielectric constant and low‐loss ceramics in the (Zn 1− x Co x )Ta 2 O 6 ceramics have been prepared by the conventional mixed oxide route and their microwave dielectric properties have been investigated. A phase change or crossover from ZnTa 2 O 6 to CoTa 2 O 6 occurred at x =0.07 and was completed at x =0.11 and it tends to form a continuous solid solution elsewhere. An over‐sintered specimen would lead to a slight decrease in the density resulting in a decline of the dielectric constant and the Q × f value. The specimen with x =0.05 possessed an excellent combination of microwave dielectric properties: ɛ r ∼38.47, Q × f ∼112 000 GHz, and τ f ∼11.2 ppm/°C. It is proposed as a candidate material for today's 3G passive components and especially small‐sized GPS patch antennas.