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The effect of some transition metal oxides on the physical properties of K0.5Na0.5Nb0.95Ta0.05O3 ceramics |
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| Authors: | Ahmed I. Ali M. M. Ahmed |
| Affiliation: | 1. Department of Physics and Energy Harvest-Storage Research Center (EHSRC), University of Ulsan, Ulsan, South Korea;2. Faculty of Industrial Education, Basic Science Department, Helwan University, Cairo, Egypt;3. Faculty of Engineering in Matteria, Mathematics and Physics Engineering Department, Helwan University, Cairo, Egypt |
| Abstract: | AbstractBoth K0.5Na0.5Nb0.95Ta0.05O3 (KNNTO) and (K0.5Na0.5Nb0.95Ta0.05O3)0.99-M0.01, M = Co3O4 and Mn2O3 (M/KNNTO) Ferromagnetic behaviour was observed for some M/KNNTO compounds. The hardness and compressive strength of all investigated samples are given. Comparisons with similar materials are discussed. Ceramics were synthesised using a solid-state reaction method. X-ray diffraction patterns of all samples revealed that the crystal structure is orthorhombic. Field-emission scanning electron microscopy was performed. Polarisation hysteresis curves indicated a disruption of ferroelectric order with the addition of M into KNNTO ceramics. The dielectric properties of the investigated ceramics have been studied as a function of frequency and temperature. |
| Keywords: | Lead-free materials characterisation ferroelectricity magnetisation dielectric properties hardness and compressive strength |