Abstract
Structural, electric and magnetic properties of YMn 1− x Fe x O 3 based ceramic compounds have been studied. The samples, prepared by a solid state reaction method, were characterized by X-ray diffraction (XRD), electric ( R ( T ) ) and magnetic measurements ( M ( T ) ) . The XRD analysis has showed that the structure of these compounds change by the increase in degree of substitution from the hexagonal ( P 6 3 c m Space Group (SG)) to the orthorhombic perovskite ( Pbnm SG). Similarly, the electrical properties varied with the materials becoming less resistive with an increase in the iron content and the relation between the thermistor constant ( B ) and temperature became linearly dependent. The magnetic characterization showed that with an increase in the iron content, the Curie temperature of antiferro-paramagnetic transition shift to higher values. At the same time, the values of effective magnetic momentum ( μ eff ) decrease as the iron content increases. The study highlights the possibility of modelling these materials for improved properties, intended to negative temperature coefficient (NTC) type thermistor applications.
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