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【答案】应助回帖
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18714445317: 金币+50, 翻译EPI+1, ★★★很有帮助, 谢谢 2015-12-07 17:13:22
As a common high pressure producing device, DAC can also carry out high pressure thermal physical property measurement. Yagi(2011) introduced the way of measuring mineral high temperature diffusion coefficient by laser scintillation method toDAC. The sample with 50μm in diameter and 3μm in thickness was sprayed a layer of platinum on the front surface and rear surface. Under high pressure, front surface was heated by laser pulse with 2ns peorid, and 1.06μm wavelength. To detect the rear surface temperature, a beam of 0.78μm continuous wave probe beam was irradiated, and the back temperature of the sample could be calculated through the reflected intensity of the continuous wave probe beam. Thermal diffusion coefficient of the sample was obtained from the analysis of the instantaneous temperature curve. In the process of measurement, thermal diffusion coefficient of the sample under room temperature and high pressure could be accurately obtained because temperature rise was no more than 10k caused by laser irradiation. At present, the device has obtained thermal diffusion coefficient under pressure of Post perovskite’s 144GPa. Howerver, the method has not been applied in high temperature condition due to technical reasons.
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