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Crystal Structure and Dielectric Properties of Bi 2 ((Mg 1/3 Nb 2/3 ) 1‐x Ti x ) 2 O 7 Ceramics
Author(s) -
Dong Siyuan,
Fan Xiaojian,
Wang Xiaoli
Publication year - 2014
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12262
Subject(s) - materials science , pyrochlore , orthorhombic crystal system , ceramic , dielectric , sintering , temperature coefficient , analytical chemistry (journal) , permittivity , ceramic capacitor , crystal structure , capacitance , capacitor , mineralogy , crystallography , composite material , phase (matter) , chemistry , optoelectronics , electrode , physics , organic chemistry , chromatography , quantum mechanics , voltage
Bi 2 ((Mg 1/3 Nb 2/3 ) 1‐x Ti x ) 2 O 7 ceramics with 0 ≤ x ≤ 0.4 were synthesized using solid‐state reaction method and could be sintered densely at low temperature under 950 °C. The crystal structure is pure cubic pyrochlore for the compositions with 0 ≤ x ≤ 0.3. When x > 0.3, it transforms from orthorhombic weberite into cubic pyrochlore with the increase in sintering temperature. Permittivity of cubic pyrochlore Bi 2 ((Mg 1/3 Nb 2/3 ) 1‐x Ti x ) 2 O 7 ceramics with 0 ≤ x ≤ 0.2 is ~160. In addition, the ceramics have very low dielectric loss (<4 × 10 −4 ) and tunable temperature coefficient of capacitance from −300 to −500 ppm/°C with the increase in Ti content. These merits make the compositions be potential candidates for multilayer ceramic capacitors and low‐temperature co‐fired ceramics.