【摘要】 相对于传统的连续激光加热方法,脉冲激光加热能够显著缩短加热时间,从而有效阻止金刚石样品腔内各组分的化学反应。基于北京同步辐射装置(Beijing synchrotron radiation facility,BSRF)高压实验站原有的连续激光加热系统,建立了可应用于高压X射线衍射实验的脉冲激光加热方法。该方法利用信号发生器对脉冲激光器、测温电荷耦合器件(Charge Coupled Device,CCD)光谱仪以及X射线探测器进行同步控制,实现了脉冲激光对样品加热,并在加热周期内完成温度谱及高压衍射数据的同步采集。利用高压条件下的Pt样品,对脉冲激光加热过程中样品的温度稳定性、重复性以及温度梯度进行了测试,并完成了原位X射线衍射实验。该脉冲激光加热系统的搭建,为在BSRF高压实验站开展原位脉冲激光加热方法研究提供了条件,也为将来在北京高能同步辐射光源上实施相关方法奠定了基础。更多还原

【Abstract】 [Background] Compared with the traditional continuous-wave laser heating method, the pulse laser heating(PLH) technology can minimize the heating time to prevent the potential chemical reactions in the sample chamber of diamond anvil cell. [Purpose] This study aims to construct an in-situ pulsed laser heating method which can be applied in high pressure X-ray diffraction experiments. [Methods] Based on the continuous-wave laser heating system of the high-pressure beamline of Beijing synchrotron radiation facility(BSRF), a signal generator was used to synchronize the pulsed laser, charge coupled device(CCD) spectrometer and X-ray detector, made it capable to heat the sample with pulsed laser, and collect the thermal radiation spectrum and high-pressure diffraction data during heating. The temperature stability, repeatability and temperature gradient of Pt samples heated by pulsed laser under high pressure were measured, and the in-situ X-ray diffraction experiments were completed by using the cumulative time method. [Results] Experimental results show that the axial temperature gradient is larger when the temperature is low, but decreases with the increase of temperature. The PLH high-pressure XRD experimental data of Pt with good quality are collected by using the in-situ X-ray diffraction patterns. [Conclusions] The in-situ PLH method for high-pressure X-ray diffraction experiments enables the pulsed laser to have heating ability at the highpressure beamline of BSRF, and lays a foundation for the future research on the application of related methods at the new High Energy Photon Source(HEPS) in Beijing.更多还原