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Microwave dielectric properties of the spinel composition Mg1+xTixAl2-2xO4

A. BADEV1,2,* , I. ILIEV1, J.P. CAMBRONNE2, T. LEBEY2, A. BARNABE3, V. LEVCHEVA4

Affiliation

  1. Department of non-ferrous metals and semiconductors- UCTM, Sofia, Bulgaria
  2. Laboratory of Plasma and Conversion of Energy (LAPLACE), 31062 Toulouse cedex 9, France
  3. Centre for research in Materials and Engineering (CIRIMAT), 31062 Toulouse cedex 9, France
  4. Department of Radiophysics, Physical Faculty of Sofia University Sofia, Bulgaria

Abstract

The objects of our research is magnesium aluminates (spinel), in which the electric charge of Al3+ cation is partially substituted with constitutive trivalent cation of Mg2+ and Ti 4+ in the system with the following composition: Mg1+xTixAl2-2xO4 with (x) varying from 0,1 to 0,6. X-ray diffraction data shows that within the above values of (x) the composition is a single phase spinel. The microwave basic parameters were measured as εr, tan δ and τf, respectively with the following values: εr = 6-12, tanδ = (1.5-3.5) x 10-4 at 10 GHz and Qf = 70 000 – 90 000, and τf from -50 to -70 ppm/deg.

Keywords

Substituted aluminates, Microwave properties, Structure.

Citation

A. BADEV, I. ILIEV, J.P. CAMBRONNE, T. LEBEY, A. BARNABE, V. LEVCHEVA, Microwave dielectric properties of the spinel composition Mg1+xTixAl2-2xO4, Optoelectronics and Advanced Materials - Rapid Communications, 1, 10, October 2007, pp.507-509 (2007).

Submitted at: Aug. 7, 2007

Accepted at: Aug. 30, 2007