Recently, there have been considerable interests in the Li-containing spinel oxides as promising microwave dielectric materials. Li loss at elevated temperatures, however, is known to be inevitable, resulting in deterioration on dielectric performances. Here the influence of Li nonstoichiometry on the microwave dielectric properties of Li₂ZnGe₃O₈, a spinel oxide, was reported. An appropriate level of Li excess enhanced the densification of Li₂ZnGe₃O₈ and increased dielectric performances. In contrast, high level of Li excess induced the formation of the secondary phase of Li₂ZnGeO₄ confirmed by XRD and Raman spectra, which in turn lowered the dielectric properties. Typically, a composition with x = 0.075, in the Li_2(1+x)ZnGe₃O₈ ceramics exhibited the enhanced microwave dielectric properties with ε_r = 10.68, Q × f = 77,300 GHz (at 13.3 GHz), and τ_f = − 70.35 ppm/°C when sintered at 940 °C for 4 h. Moreover, these compounds have well chemical compatibility with the silver electrodes.

最近，人们对含锂的尖晶石氧化物作为有希望的微波介电材料有相当大的兴趣。然而，已知在高温下不可避免的锂损失，导致介电性能下降。此处报道了锂非化学计量对尖晶石型氧化物Li ₂ ZnGe ₃ O ₈的微波介电性能的影响。适当的过量的锂增强了Li ₂ ZnGe ₃ O ₈的致密化并提高了介电性能。相反，大量过量的Li诱导了Li ₂ ZnGeO ₄的第二相的形成。由XRD和拉曼光谱证实，从而降低了介电性能。典型地，与组合物X  = 0.075，在李_{2（1 + X）} ZnGe ₃ ö _8个陶瓷表现出与增强的微波介电性能ε _{- [R}  = 10.68，Q×˚F  = 77300千兆赫（13.3千兆赫）和τ _˚F＝-在940℃下烧结4小时时为70.35ppm /℃。而且，这些化合物与银电极具有良好的化学相容性。