Abstract
Controlling the cooling rate during calcination and sintering, phase pure perovskite Ba(Zn1/3Nb2/3)O3 has been prepared by simple solid state reaction route with density >93% at relatively low sintering of 1175°C making it compatible for microwave dielectric applications. The samples are characterized by X-ray diffraction analysis and scanning electron microscopy. The X-ray diffraction shows pure perovskite phase with cubic structure. The lattice constants were obtained a = 4.1032 Å. Detailed studies of ε′ and ε′′ show that the compound exhibits dielectric anomaly at 430°C. Material shows distributed relaxation at higher temperature. Impedance analysis revealed that the impedance is mainly due to the grains. AC conduction activation energies are estimated from Arrhenius plots, and conduction mechanism is discussed.
Highlights
Ba(Zn1/3Nb2/3)O3 (BZN) is a very promising lead free perovskite material for electroceramics applications owing to its interesting dielectric properties
Sintering temperature of BZN ceramic can be reduced by the use of additives such as B2O3 and CuO
Phase pure perovskite phase of BZN is stabilized through standard solid state reaction route by using controlled cooling rate during calcination and sintering
Summary
Ba(Zn1/3Nb2/3)O3 (BZN) is a very promising lead free perovskite material for electroceramics applications owing to its interesting dielectric properties. One major problem in using BZN lies in the fact that it needs a high sintering temperature to reach a satisfactory final density ≈1350∘C [4, 5]. Chemical processes such as sol-gel and precipitation method were used to reduce the sintering temperature of the ceramics [6,7,8]. We successfully prepared Ba(Zn1/3Nb2/3)O3 in pure perovskite phase with high density (>93%) at relatively low sintering temperature without using additives. This has been achieved by controlling the rate of cooling and heating during calcination and sintering. Structural, dielectric, and electrical impedance analyses of prepared BZN ceramics are investigated and compared with those reported earlier
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