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Compositional Dependence of Microwave Dielectric Properties in (1 − x )(Na 1/2 Nd 1/2 )TiO 3 − x Nd(Mg 1/2 Ti 1/2 )O 3 Ceramics
Author(s) -
Kim Jae Beom,
Yoon Ki Hyun,
Cho Yong S.
Publication year - 2003
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.1151-2916.2003.tb03441.x
Subject(s) - superlattice , perovskite (structure) , dielectric , materials science , analytical chemistry (journal) , microwave , crystal (programming language) , temperature coefficient , crystal structure , crystallography , chemistry , optoelectronics , physics , chromatography , quantum mechanics , computer science , programming language , composite material
The compositional dependence of microwave dielectric properties has been investigated in the (1 − x )(Na 1/2 Nd 1/2 )TiO 3 − x Nd(Mg 1/2 Ti 1/2 )O 3 (NNT‐NMT) system. The addition of NMT results in significant improvement in the quality factor and the temperature coefficient of frequency, but gradually decreases the dielectric constant from ∼100 for pure NNT to ∼25 for pure NMT. The single perovskite phase is observed with various { hkl } superlattice reflections over the entire compositional range. The increasing tendency of peak splitting with increasing x at some perovskite reflections strongly suggests that the crystal structure of the system changes to lower symmetry structures. This is confirmed using infrared reflectivity spectra. The superlattice reflections related to structural deviation become more predominant as the composition reaches pure NMT. Particularly, {111} superlattice reflections are believed to be associated with the 1:1 cation ordering and responsible for the observed abrupt increase in quality factor at x > 0.7.