中国物理B ›› 2018, Vol. 27 ›› Issue (2): 26201-026201.doi: 10.1088/1674-1056/27/2/026201
• SPECIAL TOPIC—Soft matter and biological physics (Review) • 上一篇 下一篇
Lei-hao Feng(冯雷豪), Qi-wei Hu(胡启威), Li Lei(雷力), Lei-ming Fang(房雷鸣), Lei Qi(戚磊), Lei-lei Zhang(张雷雷), Mei-fang Pu(蒲梅芳), Zi-li Kou(寇自力), Fang Peng(彭放), Xi-ping Chen(陈喜平), Yuan-hua Xia(夏元华), Yohei Kojima(小岛洋平), Hiroaki Ohfuji(大藤宏明), Duan-wei He(贺端威), Bo Chen(陈波), Tetsuo Irifune(入舩徹男)
Lei-hao Feng(冯雷豪)1, Qi-wei Hu(胡启威)1, Li Lei(雷力)1, Lei-ming Fang(房雷鸣)2, Lei Qi(戚磊)1, Lei-lei Zhang(张雷雷)1, Mei-fang Pu(蒲梅芳)1, Zi-li Kou(寇自力)1, Fang Peng(彭放)1, Xi-ping Chen(陈喜平)2, Yuan-hua Xia(夏元华)2, Yohei Kojima(小岛洋平)3, Hiroaki Ohfuji(大藤宏明)3, Duan-wei He(贺端威)1, Bo Chen(陈波)2, Tetsuo Irifune(入舩徹男)3
摘要:
Tantalum nitride (TaN) compact with a Vickers hardness of 26 GPa is prepared by a high-pressure and high-temperature (HPHT) method. The crystal structure and atom occupations of WC-type TaN have been investigated by neutron powder diffraction, and the compressibility of WC-type TaN has been investigated by using in-situ high-pressure synchrotron x-ray diffraction. The third-order Birch-Murnaghan equation of state fitted to the x-ray diffraction pressure-volume (P-V) sets of data, collected up to 41 GPa, yields ambient pressure isothermal bulk moduli of B0=369(2) GPa with pressure derivatives of B0'=4 for the WC-type TaN. The bulk modulus of WC-type TaN is not in good agreement with the previous result (B0=351 GPa), which is close to the recent theoretical calculation result (B0=378 GPa). An analysis of the experiment results shows that crystal structure of WC-type TaN can be viewed as alternate stacking of Ta and N layers along the c direction, and the covalent Ta-N bonds between Ta and N layers along the c axis in the crystal structure play an important role in the incompressibility and hardness of WC-type TaN.
中图分类号: (High-pressure effects in solids and liquids)