Effect of the addition of V₂0₅-Te0₂ glass on the micro structure and dielectric properties of CaCu₃Ti₄0₁₂ / Siti Nurshafina Ahmad Jumali

CaCu3Ti40]2 (CCTO) is a well-known nonelectrical material possessing high and nearly constant (room temperature to 300°C) dielectric constant at 1 kHz. It is being widely used in the electronic industries to manufacture electronic components such as multilayer capacitor (MLCC), DRAMs, microwave devices, electronic devices in automobiles and aircrafts. The properties like high dielectric permittivity of CaCu3Ti40i2 depend upon the particle size and powder morphology. The particle size and powder morphology of CaCu3Ti40]2 depend on the different processing parameters that are temperature, heating rate, duration and atmosphere. Recently, several studies have been performed on synthesis of CaCu3Ti40i2 in addition with glass to attain a material with relatively high dielectric constant and low dielectric loss. CaCu3Ti40)2 synthesized using solid state method is one of technique which possesses high purity and close control of powder morphology, which will result in the desired microstructure and dielectric behavior. Under this context the present study was carried out to evaluate the effect of different fraction of additive parameters on the phase purity, particle size and powder morphology of CaCu3Ti40i2 to study the effect on microstructure and the dielectric behavior of CaCu3Ti40)2. For preparation of pure CaCu3Ti40i2 ceramic, the optimized ratio for synthesis of CaCu3Ti40i2 was found to be 1:3:4 for CaC03, CuO and Ti02. For preparation of V205-Te02 glass, the optimized the fraction of composition for V2O5 is 0.30 while 0.70 for Te02. The powder morphology, particle size, densification behavior and dielectric behavior of the sintered samples have been studied. The growth grain size is found to enhance the dielectric properties of composition by increasing the dielectric constant and lowering the dielectric loss. The dielectric study showed its dependence upon grain size and density. Dielectric constant increases with increase in mole fraction of glass addition composition.