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Microwave Dielectric Properties of A‐Site Modified Ba(Co 0.7 Zn 0.3 ) 1/3 Nb 2/3 O 3 by La 3+
Author(s) -
Bian Jian Jiang,
Dong Yun Fei,
Song Guo Xiang
Publication year - 2008
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.1551-2916.2008.02292.x
Subject(s) - analytical chemistry (journal) , dielectric , materials science , perovskite (structure) , sintering , doping , phase (matter) , degree (music) , microwave , ceramic , mineralogy , crystallography , chemistry , metallurgy , physics , optoelectronics , organic chemistry , chromatography , quantum mechanics , acoustics
The sintering behavior, ordering state, and microwave dielectric properties of Ba 1− x La 2 x /3 (Zn 0.3 Co 0.7 ) 1/3 Nb 2/3 O 3 Ceramics (0≤ x ≤0.06) were investigated in this paper. The X‐ray diffraction (XRD) results show that all samples exhibit a single perovskite phase except for the sample with x ≥0.03. The sinterability is slightly improved by La doping. The long range order (LRO) degree on B‐site is greatly increased with the increase of x value up to x =0.015 and then slightly decreased with the further increase of x due to the increasing amount of second phases. The dielectric constant at microwave frequency decreases slightly with the increase of x when x <0.015 and increases slightly with further increasing x for the samples sintered at 1375°C/10 h. The Q × f value increases with x up to x =0.015 and then decreases with further increase of x , which is consistent with the variation trend of LRO degree. The τ f value decreases slightly with the increase of x up to 0.006, then increases greatly with the further increase of x . An optimized dielectric properties of ɛ r =34, Q × f =63 159, GHz and τ f =5.21 ppm/°C were obtained for the x =0.01 sample sintered at 1425°C/10 h.