Abstract
The effect of firing temperature on the cation distributions of Li+ and Ga3+ in the tetrahedral and octahedral sites of Li0.5Ga2.5O4 ceramics was investigated and the microwave dielectric properties of the ceramics were also characterized in this study. 7Li and 71Ga solid-state nuclear magnetic resonance (NMR) spectra revealed the preferential occupations of the Ga3+ cations in tetrahedral sites of the Li0.5Ga2.5O4 ceramics, whereas the octahedral sites of the ceramics were occupied by the Li+ and Ga3+ cations. Moreover, the order/disorder behavior of Li+ and Ga3+ cations on the octahedral sites was examined by Raman spectroscopy and crystal structure refinements; the fractions of disordered (Fd3m) Li0.5Ga2.5O4 ceramic increased from 0.9 to 10.3%, depending on the firing temperature. From this result, it is considered that the coexistence of the ordered (P4332) and disordered Li0.5Ga2.5O4 ceramics is suggested. As a result, the covalency of the cation–oxygen bonds in the GaO4 tetrahedron and MO6 octahedron (M = Li+ and Ga3+) was strongly affected by the order/disorder behavior of the Li+ and Ga3+ cation in the tetrahedral and octahedral sites. The εr of the ceramics increased from 6.1 to 10.1 with increasing firing temperature, depending on the relative density and fraction of the disordered phase. Q · f also markedly improved from 18,546 to 237,962 GHz.
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