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针对圆形端面平面对顶压砧装置中压力梯度大的问题, 本文设计了一种长条形端面的平面对顶压砧, 相应的封垫也改为长条形. 原理分析表明: 这种压砧可在沿长条形中心线的狭长区域内产生均匀分布的高压力. 本文采用长20 mm宽5 mm长条形端面的硬质合金压砧配合叶腊石封垫进行压力标定, 实验结果显示: 这种装置可产生10 GPa以上的高压, 在长条形中心线上至少12 mm长度范围内的不同位置上产生的压力基本一致, 在2.55 GPa压力时测量偏差小于2.0%, 在7.7 GPa时测量偏差小于3.6%. 这种特点很有利于对细长样品进行精确的高压物性测量.Bridgman anvil is a useful and effective tool in high-pressure research. However, in this apparatus, the pressure distribution is essentially centrosymmetric. Thus, considerable pressure gradients exist in the gasket and in the sample chamber respectively, and the uniform pressure area is limited. To improve the pressure uniformity in flat face supported anvils, we design a strip face anvil instead of conventional round face anvil and adopt an assortive strip gasket. Principle analysis and a series of pressure calibration experiments are also presented in this paper.The construction of the strip anvil and relevant parts of the apparatus are shown in the diagrams and photos. The relationship between pressure and shearing stress in the strip gasket is investigated by using the model of M. Wakatsuki, which indicates that the pressure distribution should be uniform along the central line of the strip gasket.Pressure calibration experiments are conducted by using strip anvils made of tungsten carbide with a length of 20 mm and width of 5 mm and by using the assortive strip gasket of pyrophyllite. Pressures at different places of the central line are calibrated according to the known phase transitions of bismuth in the same loading process, and the samples are assembled with symmetrical, unsymmerical, and separated local collocations, respectively.Experimental results exhibit that the pressure reaches up to 10 GPa in the central line of the strip gasket, and the pressures are almost equal at least within the range of 12 mm on the central line. The bias errores of oil pressures measured at different places of the central line are all less than 2.0% at 2.55 GPa and 3.6% at 7.7 GPa, indicating only a small pressure gradient along the central line. The main reason for the measuring bias errors lies in the difficulty of the assembly technique. Specifically, the bismuth wire is difficult to adhere to the central line of the anvil during compression. Hence, further improvement of the process is expected in the future.In conclusion, the strip anvil is a unique high-pressure apparatus. The principle analysis and pressure calibration experiments confirm that the pressure is uniform in one-dimensional direction along the central line of the strip anvil. This feature is propitious to the accurate investigation of linear samples under high pressure.
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Keywords:
- high pressure apparatus /
- strip anvil /
- pressure calibration /
- uniform pressure distribution
[1] Bridgman P W 1952 Proceeding of the American Academy of Arts and Sciences 81 165
[2] Bridgman P W 1958 The Physics of High Pressure (4th Ed.) (New York: G. Bell and Sons) p1
[3] Bassett W A, Takahashi T, Stook P W 1967 Rev. Sci. Instrum. 38 37
[4] Mao H K, Bell P M 1978 Science 200 1145
[5] Xu J A, Mao H K, Bell P M 1986 Science 232 1404
[6] Mujica A, Rubio A, Munoz A, Needs R J 2003 Rev. Modern Phys. 75 864
[7] Degtyareva O, Gregoryanz E, Somayazulu M, Dera P, Mao H K, Hemley R J 2005 Nature Mat. 4 152
[8] Mao H K, Hemley R J 2007 PNAS 104 9114
[9] Yang W, Huang X, Harder R, Clark J N, Robinson I K, Mao H K 2013 Nat. Commun. 4 1680
[10] Liang H N, Ma C L, Du F, Cui Q L, Zou G T 2013 Chin. Phys. B 22 016103
[11] Dave M, Vaidya R, Patel S G, Jani A R 2004 Bull. Mater. Sci. 27 213
[12] Liu X R, Hong S M 2007 Appl. Phys. Lett. 90 251903
[13] Liu X R, Hong S M, L S J, Shen R 2007 Appl. Phys. Lett. 91 081910
[14] Huang D H, Liu X R, Su L, Hu Y, L S J, Liu H L, Hong S M 2007 Chin. Phys. Lett. 24 2441
[15] Hamlin J J, Zocco D A, Sayles T A, Maple M B 2009 Phys. Rev. Lett. 102 177002
[16] Chen L Y, Liu X R, Li M F, Zhang D D, Wang M Y, Hong S M 2013 Acta Phys. Sin. 62 079102 (in Chinese) [陈丽英, 刘秀茹, 黎明发, 张豆豆, 王明友, 洪时明 2013 62 079102]
[17] Wakatsuki M, Ichinose K, Aoki T 1972 Jpn. J. Appl. Phys. 11 578
[18] Eremets M I 1996 High Pressure Experimental Methods (New York: Oxford University Press)
[19] Piermarini G J, Block S, Barnett J D 1973 J. Appl. Phys. 44 5377
[20] Besson J M, Pinceaux J P 1979 Rev. Sci. Instrum. 50 541
[21] Chai M, Brown J M 1996 Geophys. Res. Lett. 23 3539
[22] Kenichi T 2001 J. Appl. Phys. 89 662
[23] Angel R J, Bujak M, Zhao J, Gatta G D, Jacobsen S D 2006 J. Appl. Cryst. 40 26
[24] Mao H K, Badro J, Shu J, Hemley R J, Singh A K 2006 J. Phys.: Condens. Matt. 18 S963
[25] Dewaele A, Loubeyre P 2007 High Press. Res. 27 419
[26] Hong S M, Chen L Y, Liu X R, Wu X H, Su L 2005 Rev. Sci. Instrum. 76 053905
[27] Chen L Y 2014 Ph. D. Dissertation (Chengdu: Southwest Jiaotong University) (in Chinese) [陈丽英 2014 博士学位论文 (成都: 西南交通大学)]
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[1] Bridgman P W 1952 Proceeding of the American Academy of Arts and Sciences 81 165
[2] Bridgman P W 1958 The Physics of High Pressure (4th Ed.) (New York: G. Bell and Sons) p1
[3] Bassett W A, Takahashi T, Stook P W 1967 Rev. Sci. Instrum. 38 37
[4] Mao H K, Bell P M 1978 Science 200 1145
[5] Xu J A, Mao H K, Bell P M 1986 Science 232 1404
[6] Mujica A, Rubio A, Munoz A, Needs R J 2003 Rev. Modern Phys. 75 864
[7] Degtyareva O, Gregoryanz E, Somayazulu M, Dera P, Mao H K, Hemley R J 2005 Nature Mat. 4 152
[8] Mao H K, Hemley R J 2007 PNAS 104 9114
[9] Yang W, Huang X, Harder R, Clark J N, Robinson I K, Mao H K 2013 Nat. Commun. 4 1680
[10] Liang H N, Ma C L, Du F, Cui Q L, Zou G T 2013 Chin. Phys. B 22 016103
[11] Dave M, Vaidya R, Patel S G, Jani A R 2004 Bull. Mater. Sci. 27 213
[12] Liu X R, Hong S M 2007 Appl. Phys. Lett. 90 251903
[13] Liu X R, Hong S M, L S J, Shen R 2007 Appl. Phys. Lett. 91 081910
[14] Huang D H, Liu X R, Su L, Hu Y, L S J, Liu H L, Hong S M 2007 Chin. Phys. Lett. 24 2441
[15] Hamlin J J, Zocco D A, Sayles T A, Maple M B 2009 Phys. Rev. Lett. 102 177002
[16] Chen L Y, Liu X R, Li M F, Zhang D D, Wang M Y, Hong S M 2013 Acta Phys. Sin. 62 079102 (in Chinese) [陈丽英, 刘秀茹, 黎明发, 张豆豆, 王明友, 洪时明 2013 62 079102]
[17] Wakatsuki M, Ichinose K, Aoki T 1972 Jpn. J. Appl. Phys. 11 578
[18] Eremets M I 1996 High Pressure Experimental Methods (New York: Oxford University Press)
[19] Piermarini G J, Block S, Barnett J D 1973 J. Appl. Phys. 44 5377
[20] Besson J M, Pinceaux J P 1979 Rev. Sci. Instrum. 50 541
[21] Chai M, Brown J M 1996 Geophys. Res. Lett. 23 3539
[22] Kenichi T 2001 J. Appl. Phys. 89 662
[23] Angel R J, Bujak M, Zhao J, Gatta G D, Jacobsen S D 2006 J. Appl. Cryst. 40 26
[24] Mao H K, Badro J, Shu J, Hemley R J, Singh A K 2006 J. Phys.: Condens. Matt. 18 S963
[25] Dewaele A, Loubeyre P 2007 High Press. Res. 27 419
[26] Hong S M, Chen L Y, Liu X R, Wu X H, Su L 2005 Rev. Sci. Instrum. 76 053905
[27] Chen L Y 2014 Ph. D. Dissertation (Chengdu: Southwest Jiaotong University) (in Chinese) [陈丽英 2014 博士学位论文 (成都: 西南交通大学)]
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