Abstract
A new microwave dielectric ceramic Ba 3LaTa 3O 12 has been prepared by conventional solid-state ceramic route. Through Rietveld refinement of X-ray powder diffraction data, the compound is identified as an A 4B 3O 12-type B-site cation-deficient perovskite with space group R 3 ¯ m and lattice constants a = 5.7573(2) Å, c = 28.2386(2) Å, V = 810.62(4) Å 3 and Z = 3. The microwave dielectric properties of Ba 3LaTa 3O 12 were investigated. The compound exhibits a relative dielectric constant ( ɛ r) of 36.8, a quality factor Q u × f of 21,965 at 6.4040 GHz and a small negative temperature coefficient of resonant frequency ( τ f) of −49.6 ppm/°C.
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