A new low-loss SrLaMgTaO6 microwave dielectric ceramic with cubic structure

This study delves into the microwave dielectric properties of SrLaMgTaO6 ceramics synthesized via traditional solid-state methods. Precise lattice parameters observed at the optimal temperature were as follows: a = b = c = 7.97327 & Aring;, with a corresponding unit volume of V = 506.884775 & Aring;(3). Utilizing X-ray diffraction (XRD) patterns and detailed Rietveld refinement analysis at various temperatures revealed that SrLaMgTaO6 ceramics possess a cubic structure, specifically within the Fm-3 m (225) space group. The structure of ceramic particles was further studied by scanning electron microscopy ( SEM), and it was found that the optimum relative density was 95.7%. Additionally, within SrLaMgTaO6 ceramic samples, the study explored the relationship between relative density, porosity, filler fraction, and microwave performance. A significant finding was the impact of the Ta-O bond valence (VTa-O) on the frequency temperature coefficient. At 1480 degrees C, SrLaMgTaO6 ceramics demonstrated superior performance metrics: a dielectric constant (epsilon(r)) of 21.68, a quality factor (Q x f) of 16,739 GHz (f = 8.74 GHz), and a frequency temperature coefficient (tau(f)) of -79.1 ppm/degrees C. The findings highlight the material's potential as a robust dielectric in microwave applications.