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Microwave Dielectric Properties of Rare‐Earth Ortho‐Niobates with Ferroelasticity
Author(s) -
Kim DongWan,
Kwon DoKyun,
Yoon Sung Hun,
Hong Kug Sun
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.1551-2916.2006.01302.x
Subject(s) - dielectric , temperature coefficient , ferroelasticity , materials science , microwave , distortion (music) , phase (matter) , diffraction , mineralogy , analytical chemistry (journal) , condensed matter physics , optics , ferroelectricity , chemistry , optoelectronics , composite material , physics , amplifier , organic chemistry , cmos , chromatography , quantum mechanics
In the search for more temperature‐stable materials, herein, we report on the microwave dielectric properties and trends of the rare‐earth niobate series (RENbO 4 ), with the main emphasis being placed on LaNbO 4 . LaNbO 4 has excellent microwave dielectric properties, especially an anomalous small positive temperature coefficient of resonant frequency of 9 ppm/°C. We present the phase transformation and ferroelastic domain configuration of RENbO 4 studied using in situ X‐ray diffraction and high‐resolution transmission electron microscopy. The structural distortion caused by the phase transformation is a dominant factor in the relative dielectric constant and temperature coefficient of the resonant frequency in RENbO 4 .