This work reports the high temperature anomalous phase transition with high dielectric constant and low band gap in pure zinc germanate (Zn₂GeO₄) nanorods. Crystal structure of Zn₂GeO₄ nanorods were analyzed by X-ray powder diffraction and Raman studies. Electron microscopy reveals that nanorods have average diameter and length of 30 nm and 100 nm, respectively. UV–ViS study indicates low band gap of 3.96 eV. The observed dielectric constant is 40 times higher than bulk Zn₂GeO₄. High dielectric constant of ~772 and phase transition was observed around 400 °C. In the low and high temperature range, activation energy were ~0.33 and 1.34 eV. High dielectric constant and shrinkage in bang gap with temperature phase transition of Zn₂GeO₄ nanorods makes it the potential candidate for nano-optoelectronic and nanodevices applications in near future.

这项工作报告纯锗酸锌（Zn ₂ GeO ₄）纳米棒中具有高介电常数和低带隙的高温异常相变。通过X射线粉末衍射和拉曼研究分析了Zn ₂ GeO ₄纳米棒的晶体结构。电子显微镜显示纳米棒的平均直径和长度分别为30 nm和100 nm。UV-ViS研究表明，低带隙为3.96 eV。观察到的介电常数比块状Zn ₂ GeO ₄高40倍。在400°C附近观察到〜772的高介电常数和相变。在低温和高温范围内，活化能分别为〜0.33和1.34 eV。Zn ₂ GeO ₄纳米棒具有高的介电常数和随着温度相变的爆炸间隙收缩，使其在不久的将来成为纳米光电和纳米器件应用的潜在候选者。