Abstract
A number of compounds in the [Formula: see text] (x = 0–2) series were prepared through a mixed oxide solid-state sintering route. These compounds crystallized into orthorhombic (Pbnm) structure. The relative permittivity [Formula: see text] and temperature coefficient of resonance frequency [Formula: see text] depended on the polarizability of constituent cations while the quality factor [Formula: see text] was affected by ordering of cations. These compounds exhibited promising [Formula: see text] (74–90) and [Formula: see text] (10[Formula: see text]208–14[Formula: see text]116 GHz); however, the observed high [Formula: see text] (157–542 ppm/[Formula: see text]C) requires further investigations to tune it through zero.
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