Journal
CERAMICS INTERNATIONAL
Volume 41, Issue 1, Pages 663-669Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2014.08.119
Keywords
Sol-gel process; Grain size; Dielectric properties; LiCrNiO
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Funding
- Higher Education Research Promotion and National Research University Project of Thailand
- Office of the Higher Education Commission, through the Advanced Functional Materials Cluster of Khon Kaen University
- Center of Excellence for Innovation in Chemistry (PERCH-CIC), Commission on Higher Education, Ministry of Education
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LixCryNi1-x-yO (where x=0.30; y=0.02, 0.05, 0.10) ceramics were prepared using a sol-gel process and sintered at 1300 degrees C for 5 h. The sintered pellet samples were characterized using X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. Dielectric properties were also investigated. All sintered samples exhibited only cubic rock-salt NiO structure and giant dielectric constants of similar to 10(4)-10(5) over the measured frequency range with low loss tangents. Both values of dielectric constants and loss tangents decreased with increasing Cr content. This was related to the reduction of grain size as Cr content in LiCrNiO increased. Giant dielectric constants in these samples possibly resulted from boundary layer capacitor structures and partially from defect dipoles. The sample with Cr a molar ratio of 0.10 had the best dielectric properties with very high epsilon(r) (4.76 x 10(4)) and the lowest tan delta (0.46) measured at 10 kHz and room temperature. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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