Premium
Effects of Sm 3+ Substitution on Dielectric Properties of Ca 1− x Sm 2 x /3 TiO 3 Ceramics at Microwave Frequencies
Author(s) -
Kim Woo Sup,
Kim Eung Soo,
Yoon Ki Hyun
Publication year - 1999
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.1151-2916.1999.tb02049.x
Subject(s) - dielectric , analytical chemistry (journal) , orthorhombic crystal system , tetragonal crystal system , dielectric loss , calcium titanate , materials science , perovskite (structure) , solid solution , mineralogy , chemistry , crystallography , crystal structure , optoelectronics , chromatography , metallurgy
Microwave dielectric properties of Ca 1‐ x Sm 2 x /3 TiO 3 ceramics were investigated as a function of the amount of Sm 3+ substitution (0.0 ≤ x ≤ 0.8). The structure was changed from orthorhombic perovskite at x = 0.0 to tetragonal at x = 0.6. As the calcium vacancy concentration increased with increased Sm 3+ substitution, the unloaded Q value (similar/congruent 1/tan delta) increased up to the solid‐solution limit at x = 0.6 and then decreased because of formation of the secondary phase Sm 2 Ti 2 O 7 . The dielectric constant decreased with increased Sm 3+ substitution. The effects of Sm 3+ substitution on dielectric loss and dielectric constant of the specimens were analyzed by the infrared reflectivity spectra in the range 50–4000 cm −1 , which were evaluated using the Kramers‐Kronig analysis and classical oscillator model. The correlations among dielectric constant, dielectric loss, and dispersion parameters were studied.