The BaZn_1/3Ta_2/3O₃ is a member of the new perovskit oxide generation, widely used in high frequency domain. Their high permittivity 28-30, low losses and an excellent thermal stability on a large temperature scale, make them suitable for microwave applications. The ceramics are obtained by solid state reaction. Samples were sintered in air at 1550, 1600 and 1650 ^oC temperature range for 2 hours, followed by 10 h annealing at 1410 ^oC, to improve the material’s properties, [1, 2, 3]. Scanning Electron Microscopy, X-ray diffraction and Energy Dispersive X-ray analysis were performed to investigate the morphology and the structure of the ceramics. A secondary phase and the unit cell distortion were found from XRD data. The sintering temperature promotes a long-range order with a 2:1 ratio of Ta and Zn cations on the octahedral positions of the perovskite structure. A HIOKI 3522 LCR bridge was used to investigate the dielectric parameters of the BZT ceramics on 45 Hz ¸ 5 MHz frequency range, in conjunction with the Quatro Cryosystem on the temperature range -150 / +150 ^oC. A high stability of the permittivity was noticed. The dielectric properties measured in the microwave range were correlated with morphological and structural properties. The Hakki-Coleman method was employed to measure the dielectric constant of the samples. Typical values of 28 at 6 GHz were found and less than 6 ppm/deg positive temperature coefficient of the resonance frequency. To improve the microwave parameters of BZT (i.e. Q x f > 100,000 GHz), sintering temperatures greater than 1600 ^oC and annealing time higher than 10h were required.

References: [1] A. Ioachim et al, Thin Solid Films 516 (2008) 1558–1562. [2] F. Roulland et al, Materials Science and Engineering B104 (2003) 156–162. [3] A.Ioachim et al, J. Optoelectr. Adv. Mater. 9 (6) (2007) 1833-1838.

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