【摘要】 为探究GaAs的晶体结构随压力的变化,在高压下对GaAs进行了原位电阻率测量,结果显示GaAs在12.0GPa左右发生zb相到Cmcm相的相变.为探究Cmcm相的状态类别,在高压下对GaAs的变温电阻率进行了测量,结果显示GaAs的Cmcm相为金属相.在6.0GPa和20.0GPa下分别对GaAs进行了第一性原理计算,结果显示Cmcm相的能带可穿过费米能级,该结果进一步证实了GaAs能够发生金属相变.更多还原

【Abstract】 In order to explore the change of GaAs crystal structure with pressures,the in situ electrical resistivity of GaAs measurements were carried out at high pressures.The results show that the phase transition of GaAs from zb phase to Cmcm phase occurs at about 12.0 GPa.To explore the status of Cmcm phase category,the variable temperature resistivity of GaAs was measured at high pressure.The results show GaAs Cmcm is metallic phase.The first principle calculation of GaAs was carried out at 6.0 GPa and 20.0 GPa,respectively.The results show that the energy band of Cmcm phase can passe through Fermi energy level,further confirming that GaAs can occur metal phase transition.更多还原