The Raman spectra of calcite, Mg‐calcite, and dolomite were measured under ambient and high pressure–temperature (P‐T) conditions using a hydrothermal diamond anvil cell, for the purpose of developing new pressure sensors suited for experiments investigating the physicochemical properties of carbonate minerals. By fitting the Raman vibrational frequencies as functions of pressure and temperature, pressure (P, in MPa) can be determined from relative frequency shifts (in cm⁻¹) of the symmetric stretching (ν₁) and librational (ν_L) lattice vibrations of calcite: P = 229(1) × (ν_{1 calcite, HP} − ν_{1 calcite, ref}), P = 162(1) × (ν_{L calcite, HP} − ν_{L calcite, ref}), or from the translational (ν_T) and librational (ν_L) lattice vibrations of dolomite: P = 371(3) × [(ν_{L dolomite, HP} − ν_{T dolomite, HP}) − (ν_{L dolomite, ref} − ν_{T dolomite, ref})], where ν_ref is the value under ambient P‐T conditions. Under elevated temperatures, correction for the effect of temperature (T, in °C) on the Raman frequency shifts can be accomplished through ν_{1 calcite, HT} = ν_{1 calcite, ref} − 6.8(5) × 10⁻⁶ × T²–0.0051(3) × T + 0.12, ν_{L calcite, HT} = ν_{L calcite, ref} − 1.07(12) × 10⁻⁵ × T²–0.00341(7) × T + 0.76, ν_{L dolomite, HT} − ν_{T dolomite, HT} = (ν_{L dolomite, ref} − ν_{T dolomite, ref}) − 0.0198(3) × T + 0.45. Application of the calcite and dolomite Raman pressure sensors should be made on condition that no phase transitions or breakdown reactions occur under high P‐T conditions, with errors of ±50 MPa and ± 5% at pressures below and above 1.0 GPa, respectively. Results from an additional experiment showed that pressures determined using alternate Raman pressure calibration methods were self‐consistent and in excellent agreement with the results determined using the ν₁ Raman peak shifts of aragonite.

中文翻译：

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方解石，镁方解石和白云石作为拉曼压力传感器在高压，高温研究中的应用

方解石，镁方解石和白云石的拉曼光谱在环境和高压力-温度（下测定P - Ť），使用水热金刚石砧细胞的条件下，用于开发适合于实验研究的物理化学性质的新的压力传感器的目的碳酸盐矿物。通过如压力和温度，压力（函数拟合拉曼振动频率P，单位为MPa）可以从相对频移来确定（以cm ^-1）的对称伸缩（的ν ₁）和librational（ν_大号）晶格振动的方解石：P = 229（1）×（ν _{1个方解石，HP} -ν _{1个方解石，参考文献}），P = 162（1）×（ν_{大号方解石，HP} - ν_{大号方解石，REF}），或从所述平移（ν _Ť）和librational（ν_大号）晶格白云石的振动：P = 371 （3）×[（ν_{大号白云石，HP} - ν _{Ť白云石，HP}） - （ν_{大号白云石，REF} - ν _{Ť白云石，REF}）]，其中ν _REF是在环境的值P - Ť条件。在升高的温度下，可以通过ν1_{方解石，HT} = ν1_{方解石，ref} − 6.8（5）×10 ^-6 × T ² –对温度（T，以℃为单位）对拉曼频移的影响进行校正。0.0051（3）× Ť + 0.12，ν_{大号方解石，HT} = ν_{大号方解石，REF} - 1.07（12）×10 ^-5 × Ť ² -0.00341（7）× Ť + 0.76，ν_{大号白云石，HT} - ν _{Ť白云石，HT} =（νL_{白云石，参考}-ν _{Ť白云石，REF}） - 0.0198（3）× Ť + 0.45。白云石的方解石和应用拉曼压力传感器应条件进行，没有相变或击穿反应在高发生P - Ť在低于和高于为1.0GPa压力分别条件下，具有±50兆帕和±5％的误差。从另外的实验结果表明，压力使用替代拉曼压力校准方法是自洽的和非常一致的结果使用所确定的确定ν _1个文石拉曼峰值偏移。