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				Torsion strain spectrum refers to the variation of the torsion strain of a specimen with external field, such as temperature, electric and magnetic fields, which facilitates the research of its dynamic behavior. We demonstrate that a torsion strain spectrum can be achieved in a high accuracy by making use of the conventional inverted torsion pendulum. By measuring its torsion strain spectrum of ferroelectric relaxor PMN-32%PT, we verify that its tetragonal-cubic transformation belongs to a burst-type martensite transformation.- 
													Keywords:
													
- torsion strain spectrum /
- internal friction /
- felectric /
- martensite transformation
 [1] Feng D, Liu Z G, Jin G J, Yang Z J 1999 Metal Physics: Phase Transformation (Vol. 2) (Beijing: Science Press) p1 (in Chinese) [冯端, 刘治国, 金国钧, 杨正举 1999 金属物理学(第二卷): 相变 (北京: 科学出版社) 第1页] [2] Liu Y H, Liu P A 2003 The Theory and Application of XRD (Beijing: Chemical Industry Press) p204 (in Chinese) [刘粤惠, 刘平安 2003 X射线衍射分析原理与应用 (北京: 化学工业出版社) 第204页] [3] Wang D R 1988 Sichuan Univ. Sci. Technol. 3 65 (in Chinese) [王登荣 1988 四川工业学院学报 3 65] [4] Ge T S 2000 The Basic Theory of Solid Internal Friction (Beijing: Science Press) p40 (in Chinese) [葛庭燧 2000 固体内耗理论基础 (北京: 科学出版社) 第40页] [5] Wang Y N, Sheng H M, Feng D, Wu X J, Kong Q P 1999 Metal Physics: Metal Mechanical Property (Vol. 3) (Beijing: Science Press) p180 (in Chinese) [王业宁, 沈慧敏, 冯端, 吴希俊, 孔庆平 1999 金属物理学 (第三卷): 金属力学性质 (北京: 科学出版社) 第180页] [6] Wang Y N, Zhou Y F, Zhang Z F 1980 Acta Phys. Sin. 12 1535 (in Chinese) [王业宁, 邹一峰, 张志方 1980 物理学报 12 1535 ] [7] Zhang J X, Fung P C W, Zeng W G 1995 Phys. Rev. B 52 268 [8] Wang H Y 2009 Ph. D. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [王海燕 2009 博士论文 (广州: 中山大学)] [9] Gong K 2003 Ph. D. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [龚康 2003 博士论文 (广州: 中山大学)] [10] Wu W J 2006 M. S. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [吴文杰 2006 硕士论文 (广州: 中山大学)] [11] Smolensky G A, Isupov V A, Agranovskaya A I, Popov S N 1962 Sov. Phys. Solid State 2 2584 [12] Singh A K, Pandey D 2001 J. Phys.: Condens Matter 12 L931 [13] Noheda B, Cox D E, Shirane G, Gao J, Ye Z G 2002 Phys. Rev. B 66 054104 [14] Feng Z Y, Zhao X Y, Luo H S 2006 Mater. Res. Bull. 41 1133 [15] Zhao X Y 2004 Ph. D. Dissertation (Shanghai: Shanghai Institute of Ceramics, Chinese Academy of Sciences) (in Chinese) [赵祥永 2004 博士论文 (上海: 中国科学院上海硅酸盐研究所)] [16] Yin Z, Luo H, Wang P, Xu G 1999 Ferroelectrics 229 207 [17] Luo H, Xu G, Wang P, Yin Z 2000 Jpn. J. Appl. Phys. 39 5581 [18] Xu Z Y 1999 The Martensitic Phase Transformation and Martensite (Beijing: Science Press) p1 (in Chinese) [徐祖耀 1999 马氏体相变与马氏体 (北京: 科学出版社) 第1页] [19] Hui Z Z, Li Z R, X Z, Zhang L Y, Yao X 2003 Chin. Sci. Bull. 13 1421 (in Chinese) [惠增哲, 李振荣, 徐卓, 张良莹, 姚熹 2003 科学通报 13 1421] 
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[1] Feng D, Liu Z G, Jin G J, Yang Z J 1999 Metal Physics: Phase Transformation (Vol. 2) (Beijing: Science Press) p1 (in Chinese) [冯端, 刘治国, 金国钧, 杨正举 1999 金属物理学(第二卷): 相变 (北京: 科学出版社) 第1页] [2] Liu Y H, Liu P A 2003 The Theory and Application of XRD (Beijing: Chemical Industry Press) p204 (in Chinese) [刘粤惠, 刘平安 2003 X射线衍射分析原理与应用 (北京: 化学工业出版社) 第204页] [3] Wang D R 1988 Sichuan Univ. Sci. Technol. 3 65 (in Chinese) [王登荣 1988 四川工业学院学报 3 65] [4] Ge T S 2000 The Basic Theory of Solid Internal Friction (Beijing: Science Press) p40 (in Chinese) [葛庭燧 2000 固体内耗理论基础 (北京: 科学出版社) 第40页] [5] Wang Y N, Sheng H M, Feng D, Wu X J, Kong Q P 1999 Metal Physics: Metal Mechanical Property (Vol. 3) (Beijing: Science Press) p180 (in Chinese) [王业宁, 沈慧敏, 冯端, 吴希俊, 孔庆平 1999 金属物理学 (第三卷): 金属力学性质 (北京: 科学出版社) 第180页] [6] Wang Y N, Zhou Y F, Zhang Z F 1980 Acta Phys. Sin. 12 1535 (in Chinese) [王业宁, 邹一峰, 张志方 1980 物理学报 12 1535 ] [7] Zhang J X, Fung P C W, Zeng W G 1995 Phys. Rev. B 52 268 [8] Wang H Y 2009 Ph. D. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [王海燕 2009 博士论文 (广州: 中山大学)] [9] Gong K 2003 Ph. D. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [龚康 2003 博士论文 (广州: 中山大学)] [10] Wu W J 2006 M. S. Dissertation (Guangzhou: Sun Yet-sen University) (in Chinese) [吴文杰 2006 硕士论文 (广州: 中山大学)] [11] Smolensky G A, Isupov V A, Agranovskaya A I, Popov S N 1962 Sov. Phys. Solid State 2 2584 [12] Singh A K, Pandey D 2001 J. Phys.: Condens Matter 12 L931 [13] Noheda B, Cox D E, Shirane G, Gao J, Ye Z G 2002 Phys. Rev. B 66 054104 [14] Feng Z Y, Zhao X Y, Luo H S 2006 Mater. Res. Bull. 41 1133 [15] Zhao X Y 2004 Ph. D. Dissertation (Shanghai: Shanghai Institute of Ceramics, Chinese Academy of Sciences) (in Chinese) [赵祥永 2004 博士论文 (上海: 中国科学院上海硅酸盐研究所)] [16] Yin Z, Luo H, Wang P, Xu G 1999 Ferroelectrics 229 207 [17] Luo H, Xu G, Wang P, Yin Z 2000 Jpn. J. Appl. Phys. 39 5581 [18] Xu Z Y 1999 The Martensitic Phase Transformation and Martensite (Beijing: Science Press) p1 (in Chinese) [徐祖耀 1999 马氏体相变与马氏体 (北京: 科学出版社) 第1页] [19] Hui Z Z, Li Z R, X Z, Zhang L Y, Yao X 2003 Chin. Sci. Bull. 13 1421 (in Chinese) [惠增哲, 李振荣, 徐卓, 张良莹, 姚熹 2003 科学通报 13 1421] 
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