Raman spectra of zircon have recently been used as a pressure scale for studies of geological fluids at high temperatures and high pressures using diamond anvil cells (DACs). The zircon scale is advantageous in high chemical stability and the large pressure response of the B1g mode. Despite its excellent applicability, the calibration of the scale has been carried out only in a narrow pressure–temperature range, especially under limited high‐temperature and high‐pressure conditions. In this study, the pressure and temperature dependence of the Raman modes of synthetic zircon was investigated up to 9.5 GPa and from room temperature to 776 K using an externally heated diamond anvil cell. Ruby and gold were used as the reference pressure scales. The Raman shift of the B1g mode for the antisymmetric stretching of the SiO4 structure in zircon showed a linear pressure dependence of 5.48(4) cm−1/GPa up to 8 GPa at room temperature, in agreement with the previous studies. Measurements under high‐pressure and high‐temperature conditions confirmed that the pressure dependence up to 9.5 GPa along the isotherms from 373 to 675 K was consistent with the room‐temperature value; the wavenumbers can be well deduced from the sum of the individual effects of pressure and temperature, obtained at ambient temperature and pressure, respectively. A comparison of the zircon scale with the c‐BN Raman spectroscopic scale confirmed that the pressures determined with these scales were in reasonable agreement. The present results provide a confident use of the zircon Raman spectroscopic scale in a wider pressure–temperature range than previous studies for the internally consistent pressure determination.

中文翻译：

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锆石作为热液 DAC 压力标度的高压高温拉曼光谱研究

锆石拉曼光谱最近被用作压力标尺，用于使用金刚石砧室 (DAC) 研究高温高压地质流体。锆石鳞片具有化学稳定性高、压力响应大的优点。乙1G模式。尽管其具有出色的适用性，但该秤的校准仅在狭窄的压力-温度范围内进行，特别是在有限的高温和高压条件下。在这项研究中，使用外部加热的金刚石砧室研究了高达 9.5 GPa、从室温到 776 K 的合成锆石拉曼模式的压力和温度依赖性。红宝石和金被用作参考压力刻度。的拉曼位移乙1GSiO 的反对称拉伸模式4锆石结构表现出 5.48(4) cm 的线性压力依赖性−1室温下 /GPa 高达 8 GPa，与之前的研究一致。高压和高温条件下的测量证实，沿 373 至 675 K 等温线的压力依赖性高达 9.5 GPa，与室温值一致；波数可以从分别在环境温度和压力下获得的压力和温度的单独影响的总和中很好地推断出来。锆石鳞片与锆石鳞片的比较C‐BN 拉曼光谱标度证实，用这些标度确定的压力具有合理的一致性。目前的结果为锆石拉曼光谱尺度在比以前的内部一致压力测定研究更宽的压力-温度范围内提供了可靠的使用。