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| 1 | Thermal expansion of kyanite at ambient pressure:An X-ray powder diffraction study up to 1000℃显示文摘The thermal expansion coefficients of kyanite at ambient pressure have been investigated by an X-ray powder diffraction technique with temperatures up to 1000℃.No phase transition was observed in the experimental temperature range.Data for the unit-cell parameters and temperatures were fitted empirically resulting in the following thermal expansion coefficients:α_a = 5.8(3)×10^(-5).α_b = 5.8 (1)×10^(-5),α_c = 5.2(1)×10^(-5),andα_V = 7.4(1)×10^(-3)℃^(-1),in good agreement with a recent neutron powder diffraction study.On the other hand,the variation of the unit-cell anglesα,βand y of kyanite with increase in temperature is very complicated,and the agreement among all studies is poor.The thermal expansion data at ambient pressure reported here and the compression data at ambient temperature from the literature suggest that,for the kyanite lattice,the most and least thermally expandable directions correspond to the most and least compressible directions,respectively. | Xi Liu Qiang He Hejing Wang Michael E. Fleet Xiaomin Hu | 2010 | Geoscience Frontiers2010，1，1： | 11 |
| 2 | 长石在高温高压条件下的物理化学行为显示文摘长石是地学上非常重要的矿物之一。它有可能随着板块俯冲而进入地球深部,因此它在高温高压条件下的相行为以及物理化学性质对地球深部地球动力学研究非常有意义。本文总结了长石端员组份(钾、钠、钙长石)以及其固溶体系列已知的高温、高压实验数据,并绘制成相图。已有的研究成果显示:这三种端员组份在高压下的相行为有较大差异,并产生了许多只在高温高压条件下稳定的相如K-Holl-I、K-Holl-II、CF、CAS及CaPv等。由这些高压相构成的具有长石成分的不同相组合的密度在约5~23GPa的压力范围内超过地幔岩的密度,因此这些相组合可以主动俯冲到上地幔的深处。另一方面,已有研究表明,这些高压相对碱金属及碱土金属在地幔中的赋存状态有着非常重要的影响。 | 刘曦 胡张翼 邓力维 | 2010 | 岩石学报2010，26，12： | 4 |
| 3 | Thermal equation of state of a natural kyanite up to 8.55 GPa and 1273 K显示文摘The thermal equation of state of a natural kyanite has been investigated with a DIA-type,cubic-anvil apparatus(SAM85)combined with an energy-dispersive synchrotron X-ray radiation technique up to 8.55 GPa and 1273 K.No phase transition was observed in the studied pressure-temperature(P-T)range.The Le Bail full profile refinement technique was used to derive the unit-cell parameters.By fixing the bulk modulus K 0 as 196 GPa and its pressure derivative K0 as 4,our P-V(volume)-T data were fitted to the high temperature BircheMurnaghan equation of state.The obtained parameters for the kyanite are:V_(0)=294.05(9)Å^(3),a=2.53(11)×10^(-5)K^(-1) and(K/T)P=-0.021(8)GPa∙K^(-1).These parameters have been combined with other experimentally-measured thermodynamic data for the relevant phases to calculate the P-T locus of the reaction kyanite¼stishoviteþcorundum.With this thermodynamically constrained phase boundary,previous high-pressure phase equi-librium experimental studies with the multi-anvil press have been evaluated. | Qiang He Xi Liu Baosheng Li Liwei Deng Wei Liu Liping Wang | 2016 | Matter and Radiation at Extremes2016，1，5： | 1 |
| 4 | Equation of state of CAS phase to pressure of the uppermost lower mantle at ambient temperature显示文摘The CAS phase is a major constituent phase for the continental crust and basaltic compositions at the P-T conditions of the Earth’s mantle, and potentially plays an important role in the geodynamic processes related to slab subduction. Its equation of state has been investigated here at ambient temperature up to about 25 GPa by using a diamond-anvil cell and synchrotron X ray radiation. Its P-V data, fitted to the third-order Birch-Murnaghan equation, yield an isothermal bulk modulus (KT) of 185 (9) GPa and first pressure derivative ( KT′ ) of 7.2 (12). If KT′ is fixed at 4, the derived KT is 212 (4) GPa. Additionally, the CAS phase is strongly elastically anisotropic, with its a-axis direction much less compressible than c-axis direction: KT-a:KT-c = 2.19. | LIU Xi HE Qiang DENG LiWei ZHAI ShuangMeng HU XiaoMin LI BaoSheng ZHANG LiFei CHEN ZhiQiang LIU Qiong | 2011 | Science China Earth Sciences2011，54，9： | 1 |
| 5 | 高温高压实验中金属添加物对实验反应速率的影响:以柯石英-刚玉-蓝晶石体系中添加铂金粉末为例显示文摘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。 | 吕明达 刘曦 熊志华 王霏 | 2015 | 高压物理学报2015，29，2： | 0 |
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