Browsing by Author "Ahmed, , M"

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    The effect of some transition metal oxides on the physical properties of K0.5Na0.5Nb0.95Ta0.05O3 ceramics
    (TAYLOR & FRANCIS LTD, 2017) Ali, Ahmed; Ahmed, , M; Hassen, , A
    Both K0.5Na0.5Nb0.95Ta0.05O3 (KNNTO) and (K0.5Na0.5Nb0.95Ta0.05O3)(0.99) - M-0.01, 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.