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Lattice dynamics and dielectric response of Ba 0.4 Sr 0.6− y Mn y TiO 3 ceramics in a wide frequency range
Author(s) -
Zhang Jingji,
Zhai Jiwei,
Xu Zhengkui,
Zhang Yewen
Publication year - 2012
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201228025
Subject(s) - dielectric , materials science , analytical chemistry (journal) , perovskite (structure) , diffraction , lattice (music) , ceramic , infrared spectroscopy , mineralogy , crystallography , condensed matter physics , chemistry , optics , physics , metallurgy , optoelectronics , organic chemistry , chromatography , acoustics
Lattice dynamics and dielectric behavior in a wide frequency range of Ba 0.4 Sr 0.6− y Mn y TiO 3 ceramics were investigated by using infrared (IR) spectroscopy and dielectric measurements. X‐ray diffraction results revealed that only perovskite phase was visible for all compositions. Mn occupied A‐site preferably as Mn 2+ when y ≤ 0.02; whereas when y ≥ 0.05, Mn occupied B‐site and was oxidized to Mn 3+ . Dielectric measurements and IR analysis indicated that the hardening of the softest mode was not remarkable with increasing Mn concentration, which resulted in an unremarkable change in tunability. Compared to the samples with y ≤ 0.02, those with y ≥ 0.05 had a higher fitted damping factor, resulting from the distortion of the perovskite lattice caused by the incorporation of Mn at the Ti‐site, which led to a low intrinsic quality factor.