Abstract
The xNi0.83Co0.15Cu0.02Fe1.9O4δ (NCCF) + (1−x)PbZr0.52Ti0.48O3 (PZT) particulate magneto ferroelectric composites with x = 0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 mole fraction were prepared by conventional ceramic double sintering method. The presence of two phases (perovskite structure of ferroelectric phase and spinal structure of ferromagnetic phase) was confirmed by X-ray diffraction. The magnetoelectric (ME) property of the particulate composites was determined at room temperature as a function of intensity of magnetic field. The temperature variation of the longitudinal modulus (L) and the internal friction (Q −1 ) of these particulate composites at 104.3 kHz was studied in the wide temperature range 30-420 ℃. The temperature variation of the longitudinal modulus in each composition of these particulate composites showed two abrupt minima. One minimum coincided with the ferroelectric - paraelectric Curie transition temperature (θE) and the other with the ferromagnetic-paramagnetic Curie transition temperature (θM). The internal friction measurement also showed two sharp peaks in each composition corresponding to those temperatures where the minima were noticed in the temperature variation of the longitudinal modulus behaviour.
Highlights
Composite materials of the type piezoelectric-Journal of Advanced Ceramics 2012, 1(4): 317-326 usually weak [2]
The piezoelectric phase in the magnetoelectric composite materials ensures that they are sensitive to vibration, which must be taken into account when these materials are used in magnetic-field pickups
The powders were mixed with 2% polyvinyl alcohol as binder and pressed into pellets of 1 cm diameter and 0.2 cm thickness, for magnetoelectric effect measurements and for internal friction properties, the powders were pressed into bars of square cross section (3.5×10−3 m)×(3.5×10−3 m) and 2.05×10−2 m long using a hydraulic press
Summary
The problem of material choice is more complicated as a result of interdoping between piezoelectric and piezomagnetic materials in the sintering process. Employing these ferroelectric and ferrite green powders, ME particulate composites with a generic formula xNi0.83Co0.15Cu0.02Fe1.9O4 δ + (1−x)PbZr0.52 Ti0.48O3 (x=0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6 mole fraction) were prepared These powders were ball-milled (RETSCH PM 200, Germany) using high purity tungsten carbide balls in tungsten carbide bowls in ethyl alcohol for 3 h. The powders were mixed with 2% polyvinyl alcohol as binder and pressed into pellets of 1 cm diameter and 0.2 cm thickness, for magnetoelectric effect measurements and for internal friction properties, the powders were pressed into bars of square cross section (3.5×10−3 m)×(3.5×10−3 m) and 2.05×10−2 m long using a hydraulic press. The coefficient was measured directly as the response of the sample to an AC magnetic input signal frequency of 80 kHz and 1Oe amplitude superimposed on the DC bias field and both the fields were arranged parallel to the sample axis
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