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Microwave dielectric properties of Mg1+x(CayTix+y)Al2-2x-2yO4 system

I. ILIEV1, A. BADEV1,* , J. P. CAMBRONNE2, V. PARVANOVA1, V. LEVTCHEVA3

Affiliation

  1. Department of non-ferrous metals and semiconductors- UCTM, Sofia, Bulgaria
  2. Laboratory of Plasma and Conversion of Energy (LAPLACE), UPS-Toulouse
  3. Department of Radio physics, Physical Faculty of Sofia University Sofia, Bulgaria

Abstract

In one of our previous research, we have analyzed a ceramic dielectric material with the following composition Mg1+xTixAl2-2xO4 (MTA). It has been revealed that the last one represents a single phase spinel with the following dielectric properties: εr = 6-12 tan δ = (1.5-3.5)x10-4, Qf =33000 – 85000 and τf = -50 to -70 ppm/deg. In the present work we have introduced very small quantities of Ca2+ (y= 0.02 – 0.08) in our ceramic compounds in order to achieve thermal compensation (τf → 0). As a result, the following dielectric material with general formula Mg1+x(CayTix+y)Al2-2x-2yO4 was synthesized. For x=0.2 and y=0.05-0.06 the material achieves full thermal compensation as it has the following properties: τf → 0, εr =12-13 and tan δ = (1-3)×10.

Keywords

Substituted aluminates, Microwave properties, Structure, Mg-Ca-TiAl-O system.

Citation

I. ILIEV, A. BADEV, J. P. CAMBRONNE, V. PARVANOVA, V. LEVTCHEVA, Microwave dielectric properties of Mg1+x(CayTix+y)Al2-2x-2yO4 system, Optoelectronics and Advanced Materials - Rapid Communications, 1, 11, November 2007, pp.636-638 (2007).

Submitted at: Sept. 25, 2007

Accepted at: Oct. 31, 2007