Zn_2SnO_4纳米线高压下的相变研究

Phase Transition of Zn_2SnO_4 Nanowires under High Pressure

利用金刚石对顶压砧(DAC)对具有反尖晶石结构的透明导体氧化物Zn2SnO4(ZTO)纳米线进行了原位高压同步辐射角散X射线衍射(ADXRD)研究。结果发现:在压力为12.9GPa附近,晶体的对称性降低,并发生晶体结构相变,产生中间过渡相;当压力为32.7GPa时,发生高压相变,形成高压相。在样品加压前后,纳米线的形貌发生了很大的变化。通过Birch-Murnaghan方程,拟合得到B′0=4时的体弹模量B0=(168.6±9.7)GPa。

In situ high-pressure angle dispersive X-ray diffraction （ADXRD） experiments on inverse spinel Zn2SnO4 （ZTO） nanowires were carried out in a diamond anvil cell （DAC） at room temperature. The crystal symmetry becomes lower at around 12.9 GPa and an intermediate phase occurs. At about 32.7 GPa, a phase transition happens and a high-pressure phase appears. After high pressure treatment,the nanowires are broken into nanorods. Through fitting the Birch-Murnaghan equation, we obtained the bulk modulus B0= （168.6±9.7） GPa for the inverse spinel ZTO nanowires, assuming its first order derivative B＇0 = 4 at ambient pressure.