Abstract
Na5Y(MoO4)4 and Na5Yb(MoO4)4 ceramics are prepared by solid state ceramic route and structural characterization has been done using powder X-ray diffraction and Laser Raman spectroscopy techniques. The presence of MoO42- units in the crystal structure is confirmed from Raman spectra. The scanning electron micrographs of the sintered ceramic samples show dense microstructure. Na5Y(MoO4)4 ceramic exhibited a maximum sintered density of 3.6g/cm3 at 600°C with a dielectric constant of 7.8, quality factor (Q × f) of 56,800GHz, and temperature coefficient of resonant frequency (τf) of −83ppm/°C, whereas Na5Yb(MoO4)4 ceramic showed a maximum sintered density of 3.9g/cm3 at 570°C with a dielectric constant of 6.9, quality factor (Q × f) of 43,400GHz, and temperature coefficient of resonant frequency (τf) of −68ppm/°C. Powder X-ray diffraction and energy dispersive X-ray spectroscopic analyses of the co-fired samples confirm good chemical compatibility with aluminium electrode for Na5Yb(MoO4)4 ceramic and hence is a suitable candidate material for ULTCC applications.
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