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Structural and Dielectric Characteristics of Barium Lanthanum Zinc Niobate
Author(s) -
Lee ChunTe,
Lin YiChang,
Huang ChiYuen,
Su CheYi,
Hu ChinLi
Publication year - 2006
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.1551-2916.2006.01312.x
Subject(s) - lanthanum , barium , dielectric , octahedron , raman spectroscopy , solid solution , crystallography , zinc , analytical chemistry (journal) , chemistry , oxygen , materials science , mineralogy , inorganic chemistry , crystal structure , physics , optics , metallurgy , optoelectronics , organic chemistry , chromatography
The dielectric properties and microstructural characteristics in solid solutions of Ba 1− x La x [Zn (1+ x )/3 Nb (2− x )/3 ]O 3 (BLZN) are investigated by measuring and observing these properties, respectively, by means of transmission electron microscopy and Raman spectroscopy. The 1:1 ordered structure of BLZN can be explained by the random‐site model for the distribution of B‐site cations. The decrease in the tolerance factor ( t ) by lanthanum substitution causes the tilting of oxygen octahedra. It appears that the onset of antiphase and inphase tilting causes the variation in the temperature coefficient of resonant frequency (τ f ). In the untilted region where t ≥1.01, the τ f shows a linear increase with decreasing tolerance factor. The region of antiphase tilting, where 0.965≤ t <1.01, causes a rapid decrease in τ f , including the reverse sign. The τ f slowly increases, where t <0.965, which is due to the presence of inphase tilting of oxygen octahedra. The τ f can be predicted by using the tolerance factor, and the near zero of τ f can be obtained with lanthanum substitution in the solid solution of the BLZN system.