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Raman characterization of rutile phase transitions under high-pressure and high-temperature
Xiao, WS; Hong, Z; Tan, DY; Weng, KN; Li, YC; Luo, CJ; Jing, L; Xie, HS; Li YC(李延春); Luo CJ(罗崇举); Liu J(刘景)
2007
发表期刊SPECTROSCOPY AND SPECTRAL ANALYSIS
卷号27期号:7页码:1340-1343
通讯作者Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China ; Chinese Acad Sci, Inst High Energy Phys, Beijing 100094, Peoples R China ; Chinese Acad Sci, Inst Geochem, Guiyang 550002, Peoples R China
文章类型Article
摘要The pressure-induced phase transition of rutile-structured TiO2 was investigated by in-situ Raman spectrum method in a laser-heated diamond anvil cell (DAC). The experiment was conducted at 35 GPa under quasihydrostatic conditions using argon as medium. At room temperature, the rutile-type TiO2 begins to transform to baddeleyite-type phase at 13.4 GPa and completes at 21 GPa, and this new high-pressure structure retains up to 35 GPa, the upmost pressure used in this study. At the pressure of 29.4 GPa the sample of baddeleyite-type TiO2 was heated by an YAG laser to about 1000-1500 degrees C, and then the baddeleyite phase transformed to a Pbca phase. The Pbca phase was heated again at 35.0 GPa and it was still stable. The sample then began to be decompressed, and the Pbca phase of TiO2 transformed to baddeleyite structure at 26.3 GPa, which stayed stable to 11.4, GPa. The formation of Pbca phase from baddeleyite phase needs the condition of high temperature, it transforms back to baddeleyite structure completely at pressure of a little below that on its formation, which suggests the boundary of the two phases can be determined at about 28 GPa. At 7.6 GPa, and the Raman spectrum shows the characteristics of the mixture of two phases of baddeleyite-type and alpha-PbO2 -type, which indicates that the baddeleyite phase transforms to alpha-PbO2 phase at about 7 GPa. The alpha-PbO2-type TiO2 is metastable under ambient condition.
关键词rutile high-pressure and high-temperature phase transformations Raman spectra baddeleyite phase Pbca phase alpha-PbO2 phase
学科领域Spectroscopy
研究领域[WOS]Spectroscopy ; Spectroscopy
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语种英语
研究领域[WOS]Spectroscopy ; Spectroscopy
WOS类目Spectroscopy
WOS记录号WOS:000248697600023
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被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/239297
专题多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Xiao, WS,Hong, Z,Tan, DY,et al. Raman characterization of rutile phase transitions under high-pressure and high-temperature[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2007,27(7):1340-1343.
APA Xiao, WS.,Hong, Z.,Tan, DY.,Weng, KN.,Li, YC.,...&刘景.(2007).Raman characterization of rutile phase transitions under high-pressure and high-temperature.SPECTROSCOPY AND SPECTRAL ANALYSIS,27(7),1340-1343.
MLA Xiao, WS,et al."Raman characterization of rutile phase transitions under high-pressure and high-temperature".SPECTROSCOPY AND SPECTRAL ANALYSIS 27.7(2007):1340-1343.
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