Crystal structures, bond characteristics, and microwave dielectric properties of Ca₂LaNbO₆ ceramics

Ca2LaNbO6 (CLN) ceramics were synthesised using a solid -state reaction process. The CLN ceramics were characterised through X-ray diffraction, transmission electron microscopy, and Rietveld refinement, and it was confirmed that they crystallised into a pure Ca2LaNbO6 phase with a monoclinic structure. The analysis of Raman spectra verified that the er exhibited a variation tendency contrary to that of Raman shift near 744 cm( -1). The Qxf was highly dependent on the lattice energy (U-b), full width at half -maximum, and packing fraction, and the zf was mainly affected by bond energy (E-b). Furthermore, P-V-L analysis indicated that both the ionicity (fi) and Ub depended heavily on the Nb-O bond, whereas E-b was dominated by the Ca-O bond. The CLN ceramics sintered at 1175(degrees )C exhibited favourable microwave dielectric properties, including er of 21.92 +/- 0.077, Qxf of 63,207 +/- 500 GHz (f0 = 8.2 GHz), and zf of - 8.06 +/- 0.41 ppm/C.