Structural phase transformation and hysteresis behavior of Cu-Zn ferrites

Abstract

A series of Cu 1-x Zn x Fe 2 O 4 ferrite (with x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) compositions were synthesized using the standard solid-state reaction technique. X-ray diffraction was used to study the structure of the above investigated samples. The theoretical and experimental lattice parameters (a th and a exp ) were calculated for each composition. A significant decrease in density and subsequent increase in porosity were observed with increasing Zn content. Curie temperature, T C , has been determined from the temperature dependence of permeability and found to decrease with increasing Zn content. The anomaly observed in the temperature dependence of permeability was attributed to the existence of two structural phases: cubic phase and tetragonal phase. Low-field hysteresis measurements have been performed using a B-H loop trace from which hysteresis parameters have been determined. Coercivity and hysteresis loss were estimated with different Zn contents.

Avaliação da microestrutura e das propriedades magnéticas de ferrita de cobre dopada com chumbo sinterizada com fase líquida

“…Através do difratograma observou-se para a amostra isenta de chumbo (x = 0,00) que as fases são formadas exclusivamente pela fase ferrita com estrutura de espinélio com simetria cúbica (Ficha padrão JCPDS 01-077-0010) e para as amostras com estequiometria contendo x = 0,05 a x = 0,20 observou-se que as fases são formadas exclusivamente pela fase ferrita com estrutura de espinélio com simetria tetragonal (Ficha padrão JCPDS 34-0425). A transformação do espinélio cúbico para tetragonal é encontrado em concentrações de cobre com x = 0,00 para x = 0,30 [26]. No nosso caso, as amostras com estequiometria contendo x = 0,05 a x = 0,20 há indícios do efeito Jahn-Teller.…”

Effects of Sintering Atmosphere on the Optical, Thermal and Electrical Properties of Inkjet Printed ZnxCu(1-x)Fe2O4 Thin Films

“…The electrical conductivity of ZnxCu(1-x)Fe2O4 thin films sintered in oxygen was about 5% higher compared to thin films sintered in vacuum. This might be due to an increase in Fe 3+ and Cu + brought about by the presence of oxygen [21]. 6(a) shows the transmission spectra of ZnxCu(1-x)Fe2O4 thin films recorded in the 200 to 800 nm wavelength range.…”

Influence of Li2CO3 addition on electrical and magnetic properties of Ni0.6Mg0.4Fe2O4

“…It is observed that the resistivity decreases with rising temperature while increases with Li 2 CO 3 contents. From the assumption of Verwey and De Boer, 23,24 it can be explained that the exchange of electrons between the ions of the same elements present in more than one valence state and are randomly distributed over crystallographic equivalent lattice cites. At the higher temperature, the respective ions which have impact upon the conduction mechanism are reduced.…”