Investigation of Phase Transitions of ZrO2 under High-Pressure and High-Temperature Conditions by Raman Spectroscopy
-
摘要: 以Ar作压力介质，在0~23 GPa压力范围内，利用金刚石压腔装置（DAC）和激光加温技术，采用显微拉曼光谱进行原位测试，对处于准静水压力条件下的斜锆石开展高温高压相变研究。研究结果表明：室温下斜锆石ZrO2于3.4 GPa时开始发生相变，到10.4 GPa时其明显转变成一个空间群为Pbca的斜方相。此新相随着压力升高，直到15.3 GPa，仍稳定存在。通过研究，首次获得了Pbca相的拉曼谱图。随后在15.3 GPa压力下进行了激光加温后淬火，结果发现，加热前的Pbca相又转变成了空间群为Pnam的PbCl2结构类型的高压相，该相直到实验最高压力23 GPa仍稳定存在。Abstract: Using argon as a pressure medium, the phase transitions of monoclinicstructured ZrO2 under high-pressure and high-temperature have been investigated by means of in situ Raman spectra method and a laser-heated diamond anvil cell (DAC). At room temperature, the baddeleyite-type ZrO2 begins to transform to a new phase at 3.4 GPa, Raman bands from the new phase become prominent at 10.4 GPa, and this new high-pressure structure retains up to 15.3 GPa, the highest pressure before heated. The new phase has been identified as Pbca phase. Raman spectrum of Pbca phase is presented for the first time based on our experiments. At pressure of 15.3 GPa the Pbca phase was heated by YAG laser to about 1 000~1 500 ℃, and then it transforms to a PbCl2 phase. This phase is stable up to 23 GPa, the highest pressure in this study.
-
Kourouklis G A, Liarokapis E. Pressure and Temperature Dependence of the Raman Spectra of Zirconia and Hafnia [J]. Am Ceram Soc, 1991, 74(3): 520-523. Quintard P E, Barberis P, Mirgorodsky A P, et al. Comparative Lattice-Dynamical Study of the Raman Spectra of Monoclinic and Tetragonal Phases of Zirconia and Hafnia [J]. J Am Ceram Soc, 2002, 85(7): 1745-1749. Arashi H, Yagi T, Akimoto S, et al. New High-Pressure Phase of ZrO2 above 35 GPa [J]. Phys Rev B, 1990, 41(7): 4309-4313. Leger J M, Tomaszewski P E, Atouf A, et al. Pressure-Induced Structural Phase Transition in Zirconia under High Pressure [J]. Phys Rev B, 1993, 47(21): 14075-14083. Ohtaka O, Yamanaka T, Kume S, et al. Structural Analysis of Orthorhombic ZrO2 by High Resolution Neutron Powder Diffraction [J]. Proc Jpn Acad, 1990, 66(B): 193-196. Haines J, Leger J M, Hull S. Characterization of the Cotunnite-Type Phases of Zirconia and Hafnia by Neutron Diffraction and Raman Spectroscopy [J]. J Am Ceram Soc, 1997, 80(7): 1910-1914. Desgreniers S, Lagarec K. High-Density ZrO2 and HfO2: Crystalline Structures and Equations of State [J]. Phys Rev B, 1999, 59(13): 8467-8472. Ohtaka O, Fukui H, Kunisada T, et al. Phase Relations and Equations of State of ZrO2 under High Temperature and High Pressure [J]. Phys Rev B, 2001, 63(17): 174108. Mao H K, Xu J, Bell P M. Calibration of the Ruby Pressure Gauge to 800 kbar under Quasihydrostatic Conditions [J]. J Geophys Res, 1986, 91(B5): 4673-4676. -
点击查看大图
计量
- 文章访问数: 7740
- HTML全文浏览量: 622
- PDF下载量: 927
下载:
