[1] LAFFERTY J M. Boride cathodes [J]. Journal of Applied Physics, 1951, 22(3): 299–309. doi: 10.1063/1.1699946
[2] HOSSAIN F M, RILEY D P, MURCH G E. Ab initio calculations of the electronic structure and bonding characteristics of LaB6 [J]. Physical Review B, 2005, 72(23): 235101. doi: 10.1103/PhysRevB.72.235101
[3] CHEN C H, AIZAWA T, IYI N, et al. Structural refinement and thermal expansion of hexaborides [J]. Journal of Alloys and Compounds, 2004, 366(1/2): L6–L8.
[4] 张宁, 张玖兴, 包黎红. 悬浮区域熔炼法制备REB6(LaB6、CeB6)单晶体及其表征 [J]. 功能材料, 2012, 43(2): 178–180 doi: 10.3969/j.issn.1007-4252.2012.02.016

ZHANG N, ZHANG J X, BAO L H, et al. Floating zone growth and characterization of single crystal REB3 (LaB6, CeB6) cathode [J]. Chinese Journal of Functional Materials, 2012, 43(2): 178–180 doi: 10.3969/j.issn.1007-4252.2012.02.016
[5] 包黎红, 那仁格日乐, 特古斯, 等. 放电等离子烧结原位合成La xCe1- xB6化合物及性能研究 [J]. 物理学报, 2013, 62: 196105 doi: 10.7498/aps.62.196105

BAO L H, NARENGERILE, TEGUS O, et al. Synthesis and properties of LaxCe1–xB6 compounds by in-situ spark plasma sintering [J]. Acta Physica Sinica, 2013, 62: 196105 doi: 10.7498/aps.62.196105
[6] 刘洪亮, 张忻, 王杨, 等. 单晶LaB6阴极材料典型晶面的电子结构和发射性能研究 [J]. 物理学报, 2018, 67: 048101 doi: 10.7498/aps.67.20172187

LIU H L, ZHANG X, WANG Y, et al. Surface electronic structures and emission property of single crystal LaB6 typical surfaces [J]. Acta Physica Sinica, 2018, 67: 048101 doi: 10.7498/aps.67.20172187
[7] 高瑞兰, 于化顺, 于普涟, 等. LaB6多晶材料的制备工艺研究 [J]. 山东大学学报(工学版), 2002, 32(6): 593–596 doi: 10.3969/j.issn.1672-3961.2002.06.024

GAO R L, YU H S, YU P L, et al. Preparation of LaB6 polycrystalline materials [J]. Journal of Shandong University (Engineering Science), 2002, 32(6): 593–596 doi: 10.3969/j.issn.1672-3961.2002.06.024
[8] NYE J F. Physical properties of crystals: their representation by tensors and matrices [M]. Oxford: Oxford University Press, 1957.
[9] HILL R. The elastic behaviour of a crystalline aggregate [J]. Proceedings of the Physical Society Section A, 1952, 65(5): 349. doi: 10.1088/0370-1298/65/5/307
[10] TIAN Y, XU B, ZHAO Z. Microscopic theory of hardness and design of novel superhard crystals [J]. International Journal of Refractory Metals and Hard Materials, 2012, 33: 93–106. doi: 10.1016/j.ijrmhm.2012.02.021
[11] BORN M, HUANG K. Dynamical theory of crystal lattices [M]. Oxford: Clarendon Press, 1968.
[12] HAINES J, LEGER J M, BOCQUILLON G. Synthesis and design of superhard materials [J]. Annual Review of Materials Research, 2001, 31(1): 1–23. doi: 10.1146/annurev.matsci.31.1.1
[13] PANDA K B, CHANDRAN K S R. Determination of elastic constants of titanium diboride (TiB2) from first principles using FLAPW implementation of the density functional theory [J]. Computational Materials Science, 2006, 35(2): 134–150. doi: 10.1016/j.commatsci.2005.03.012
[14] ANDERSON O L. A simplified method for calculating the Debye temperature from elastic constants [J]. Journal of Physics and Chemistry of Solids, 1963, 24(7): 909–917. doi: 10.1016/0022-3697(63)90067-2