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An Ultra‐Broad Working Temperature Dielectric Material of BaTiO 3 ‐Based Ceramics with Nd 2 O 3 Addition
Author(s) -
Li Lingxia,
Guo Dong,
Xia Wangsuo,
Liao Qingwei,
Han Yemei,
Peng Yin
Publication year - 2012
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.1551-2916.2012.05245.x
Subject(s) - dielectric , materials science , tetragonal crystal system , doping , ceramic , microstructure , analytical chemistry (journal) , atmospheric temperature range , mineralogy , perovskite (structure) , sintering , crystal structure , crystallography , composite material , chemistry , optoelectronics , meteorology , physics , chromatography
An ultra‐broad working temperature dielectric material, BaTiO 3 – Na 0.5 Bi 0.5 TiO 3 – Nb 2 O 5 – MgO –Glass with Nd 2 O 3 addition, was investigated for the first time. Microstructure and dielectric properties of the well‐sintered samples were studied. XRD results showed the formation of tetragonal perovskite and the presence of a second phase of NaBiTi 6 O 14 . It is found that the addition of Nd 2 O 3 produces a decrease in tetragonality of perovskite structure which could be interpreted by the substitution of Nd 3+ ions into Ti sites. Bulk densities and dielectric properties were measured as a function of Nd 2 O 3 concentration. The 0.4 mol% Nd 2 O 3 ‐doped sample showed the optimal dielectric performance (ε r = 1445, tan δ<2.0%, Δ C / C ≤±12%) that satisfied EIA ‐ X 9 R specification. In particular, the ceiling working temperature was significantly enhanced from 200°C to 270°C by doping Nd 2 O 3 . Since it possesses large dielectric constant, low dielectric loss, and stable temperature character, this material shows promising applications for the ultra‐broad temperature range components, e.g., multilayer ceramic capacitors.