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Microwave Dielectric Properties of (1− x )(Na 1/2 Nd 1/2 )TiO 3 − x La(Mg 1/2 Ti 1/2 )O 3 via Ordering and Far IR Reflectivity Spectra
Author(s) -
Kim Jae Beom,
Yoon Ki Hyun,
Cho Yong S.,
Kim Woo Sup,
Kim Eung Soo
Publication year - 2005
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.1551-2916.2005.00113.x
Subject(s) - superlattice , materials science , dielectric , analytical chemistry (journal) , perovskite (structure) , microwave , diffraction , temperature coefficient , x ray crystallography , lattice constant , spectral line , anharmonicity , crystallography , condensed matter physics , chemistry , optics , optoelectronics , physics , chromatography , quantum mechanics , astronomy , composite material
Microwave dielectric properties of (1− x )(Na 1/2 Nd 1/2 )TiO 3 (NNT)− x La(Mg 1/2 Ti 1/2 )O 3 (LMT) system have been investigated with focus on structural ordering and far IR reflectivity spectra. A single perovskite phase was found to exist with various superlattice reflections over the entire compositional range. 1:1 ordering observed in the (111) reflection of X‐ray diffraction patterns was found to progress significantly in the specimens above x =0.8. The ordering characteristics that presumably related to B‐site Mg/Ti ordering were assumed to affect favorably the quality factor at microwave frequencies. The increase of the quality factor also could be explained in terms of the decrease of lattice anharmonicity with LMT by analysis of far IR reflectivity spectra. As expected from the values of pure NNT and LMT, the dielectric constant and the temperature coefficient of frequency tended to gradually decrease with increasing LMT content.