Influence of Metal Additives on the Reaction Rate of High-Pressure and High-Temperature Experiments:Add Platinum Powder into the Coesite-Corundum-Kyanite System
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摘要: 在金刚石压腔和大腔体压机等高压设备上进行高温高压实验时，出于压力测量、激光加温、降低矿物生长速率等目的，通常在所研究的体系中添加Pt、Au、Fe等金属。添加这些金属所必需满足的一个前提条件是，它们不与研究体系发生化学反应，这一点往往受到研究者的重视；然而，这些金属添加物是否会影响化学反应速率却往往被忽视。以刚玉(Al2O3)和柯石英(SiO2)在高温高压条件下合成蓝晶石(Al2SiO5)的反应为研究对象，通过在实验中添加不同含量的Pt粉末，研究添加Pt粉末对该反应的影响。结果表明：Pt粉末的加入会促进合成反应的进行，而且Pt粉末含量越多，其促进作用越明显。研究结果可为解读相关高温高压实验结果提供重要依据。
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关键词:
- 高温高压实验 /
- 金属添加物 /
- 反应速率 /
- 铂金 /
- 柯石英-刚玉-蓝晶石体系
Abstract: In the high-pressure and high-temperature experiments with the diamond anvil cell and large volume press, metal powder (such as Pt, Au, Fe) is usually added for the purposes of pressure measurement, laser heating and mineral growth rate reduction.It is widely acknowledged that these metal additives should not react with the system under investigation.However, no enough attention has been paid to the issue whether or not these metal additives affect the reaction rate.Under appropriatep-T conditions, corundum and coesite combine to form kyanite.With the addition of different amounts of Pt powder into the system, we investigated the effect of adding Pt powder on the kyanite formation reaction.We found that adding Pt powder promotes the synthesizing reaction, and the promoting effect increases with the amount of added Pt powder.These results can provide important constraints in interpreting relevant high-pressure and high-temperature experiments. -
图 2 实验产物的SEM((a)、(b)、(c))及光学((d)、(e)、(f))显微镜照片
Figure 2. SEM images and optical microscope photos of experimental products
图 3 LMD526样品中柯石英、蓝晶石和刚玉3种物相的Raman光谱分析结果
Figure 3. Raman spectra of coesite, kyanite and corundum in LMD526
图 4 实验产物的XRD图谱(■表示物相定量时所选取的3个峰)
Figure 4. XRD patterns of experimental products (Peaks marked by ■ were chosen to quantify the phase proportion)
图 5 实验产物中蓝晶石含量与起始物质中Pt含量的关系
Figure 5. Kyanite in experimental products (mass fraction) versus Pt in starting materials
表 1 高压实验中初始物质的成分(质量分数)
Table 1. Compositions of the starting materials used in experiments (Mass fraction)
Exp.No. wAl2O3/(%) wSiO2/(%) wPt/(%) LMD525 62.96 37.04 - LMD526 55.99 32.90 11.10 LMD527 47.25 27.83 24.92 
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表 2 高压实验产物的XRD物相鉴定及定量结果
Table 2. Results of phase identification and phase proportion in the high-pressure experimental products
Exp.No. Phase File ID 2θ/(°) D/(nm) I/(%) (h k l) RIR Area (Error) w/(%) LMD525 Ky PDF#87-1708 27.944 0.319 03 100 (0 2 1) 0.36 26 830(1 799) 74.57(5) Coe PDF#77-1726 28.809 0.30964 100 (0 4 0) 0.83 13 482(831) 16.22(1) Cor PDF#83-2080 35.118 0.255 32 100 (2 1 1) 1.00 9 217(553) 9.21(1) LMD526 Ky PDF#87-1708 27.926 0.319 23 100 (0 2 1) 0.36 28 224(1 948) 86.99(6) Coe PDF#77-1726 28.792 0.309 82 100 (0 4 0) 0.83 6 004(360) 8.01(1) Cor PDF#83-2080 35.101 0.255 44 100 (2 1 1) 1.00 4 510(271) 5.00(1) LMD527 Ky PDF#87-1708 27.993 0.318 47 100 (0 2 1) 0.36 28 337(2 157) 92.11(7) Coe PDF#77-1726 28.811 0.309 62 100 (0 4 0) 0.83 3 320(200) 4.67(1) Cor PDF#83-2080 35.182 0.254 88 100 (2 1 1) 1.00 2 760(167) 3.22(1) Note:RIR refers to the area ratio of the strongest peak of phase A to the strongest peak of Cor, determined in a mixture of 50% phase A+50% Cor (mass fraction).
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