Effect of Temperature on the Elastic and Anelastic Behaviour of Magneto-Ferroelectric Composites Ba 0.8 Pb 0.2 TiO 3 + Ni 0.93 Co 0.02 Mn 0.05 Fe 1.95 O 4- in the Ferroelectric Rich Region

Author： Reddy N. RamaManohar

Publisher： Springer Publishing Company

ISSN： 1385-3449

Source： Journal of Electroceramics, Vol.11, Iss.3, 2003-12, pp. : 167-172

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Abstract

Composites with composition xBa_0.8Pb_0.2TiO₃ + (1 − x) Ni_0.93Co_0.02Mn_0.05Fe_1.95O_4- in which x varies as 1.0, 0.9, 0.7 and 0.5 in molar percent have been prepared by the conventional ceramic double sintering process. The presence of the two phases has been confirmed by X-ray diffraction. These composites were prepared for their use as magnetoferrolectric devices. Variation of longitudinal modulus (L) and internal friction loss (Q⁻¹) of these samples with temperature at 142 kHz has been studied in the wide temperature range 300 to 630 K. The elastic behaviour (L) showed a break at the ferroelectric Curie temperature (498 K) in the case of pure ferroelectric material (Ba_0.8Pb_0.2TiO₃). This break shifted to lower temperature side as the ferrite component increases in the composite. The temperature variation of internal friction loss (Q⁻¹) showed a corresponding stress induced relaxation peak at the ferroelectric-non-ferroelectric phase transition. This behaviour is explained in the light of structural phase transition.