Temperature dependence of effective thermal conductivity and effective thermal diffusivity of Ni-Zn ferrites Original Research Article

Measurement of thermal transport properties of nanocomposites of Ni-Zn ferrite in a copolymer matrix of aniline-formaldehyde has been made using transient plane source (TPS) technique. In the temperature range from room temperature to 140 °C both effective thermal conductivity (λe) and effective thermal diffusivity (χe) increase with increase in temperature and become maximum at a particular temperature which is a characteristic temperature for a given material. For further increase of temperature the λe and χe decreases slowly. An effect has also been made to predict theoretically these values by an empirical model. Addition of zinc concentration in the composite decreases the value of λe and χe over the entire range of temperature under investigation. It has also been found that the temperature at which a structural and bond strength change occurs depends on zinc concentration.