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Microwave properties of Ba1-xPbxNd2Ti5O14 dielectric resonators

A. IOACHIM1,* , M. I. TOACSĂN1, M. G. BANCIU1, L. NEDELCU1, C. A. DUŢU1, G. STOICA2

Affiliation

  1. National Institute of Materials Physics, P.O. Box MG-7, RO 077125 Bucharest-Magurele, Romania
  2. S.C. Armtech S.A., Curtea de Argeş, Romania

Abstract

The Ba1-xPbxNd2Ti5O14 (BNT: Pb) ceramics are appropriate for microwave devices due to their high dielectric constant and low loss in the microwave domain. Samples with x Pb content in the range 0 ÷ 0.5 were prepared by solid-state reaction and sintered at temperatures Ts = 1230 ÷ 1260 oC. XRD and SEM analysis indicate very good crystalline structure and polyhedral well formed grains. Controlled temperature coefficient of resonant frequency τ f is essential for dielectric resonators. The temperature coefficient of the resonant frequency τ f takes values from – 15 ppm/oC to + 70 ppm/oC. Highdensity values and adequate microwave parameters were obtained for x = 0.5 Pb content. The BNT: Pb ceramics sintered at 1250 oC and 1260 oC for 2 hours are suitable for dielectric resonators for frequencies up to 5 GHz εr = 76 ÷ 87 and Q x f ~ 5000 GHz)..

Keywords

Barium neodymium titanate, BNT: Pb, Sintering temperature, Dielectric resonators, Microwaves.

Submitted at: Nov. 14, 2006
Accepted at: May 15, 2007

Citation

A. IOACHIM, M. I. TOACSĂN, M. G. BANCIU, L. NEDELCU, C. A. DUŢU, G. STOICA, Microwave properties of Ba1-xPbxNd2Ti5O14 dielectric resonators, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1572-1575 (2007)