[1] O. Ohtaka, H. Fukui, T. Kunisada et al.. Phase relations and volume changes of hafnia under high pressure and high temperature［J］. J. Am. Ceram. Soc., 2001, 84(6): 1369～1373
[2] R. Terki, H. Feraoun, G. Bertrand et al.. First principles calculations of structural, elastic and electronic properties of XO2 (X=Zr, Hf and Th) in fluorite phase［J］. Computational Materials Science, 2005, 33(1-3): 44～52
[3] M. A. Caravaca, R. A. Casali. Ab initio localized basis set study of structural parameters and elastic properties of HfO2 polymorphs［J］. J. Physics: Condensed Matter, 2005, 17(37): 5795～5811
[4] C. A. Ponce, R. A. Casali, M. A. Caravaca. Ab initio study of mechanical and thermo-acoustic properties of tough ceramics: applications to HfO2 in its cubic and orthorhombic phase［J］. J. Physics: Condensed Matter, 2008, 20(4): 045213
[5] Liu Qijun, Liu Zhengtang, Feng Liping et al.. First principles calculation of electronic structure and elastic constants of tetragonal HfO2 crystal［J］. J. Beijing Uion University (Natural Sciences), 2009, 23(3): 76～80
[6] R. Wu, B. Zhou, Q. Li et al.. Elastic and vibrational properties of monoclinic HfO2 from first-principles study［J］. J. Phys. D: Appl. Phys., 2012, 45(12): 125304
[7] A. A. Demkov. Investigating alternative gate dielectrics: a theoretical approach［J］. Physica Status Solidi, 2001, 226(1): 57～67
[8] Chen Hongsun. Metal Elastic Anisotropy［M］. Beijing: Metallurgical Industry Press, 1996. 20～80
[9] Z. J. Wu, E. J. Zhao, H. P. Xiang et al.. Crystal structures and elastic properties of superhard IrN2 and IrN3 from first principles［J］. Phys. Rev. B, 2007, 76(5): 054115
[10] Zhang Ming, Zheng Maosheng, He Jiawen. Geometrical average model of polycrystal material elastic constants［J］. Progress in Natural Science, 2001, 11(5): 518～521
[11] R. Hill. The elastic behaviour of a crystalline aggregate［J］. Proc. Phys. Soc. A, 1952, 65(5): 349～354
[12] Li Yanling. Theoretical design methods of new-type superhard materials: brief introduction and prospect ［J］. J. Xuzhou Normal University (Natural Science Edition), 2010, 28(3): 1～10
