STRUCTURE DETERMINATION OF GAMMA'-FE4N AND EPSILON-FE3N
STRUCTURE DETERMINATION OF GAMMA'-FE4N AND EPSILON-FE3N
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DOI：
10.1016/0925-8388(95)01610-4
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发表时间：
1995-08-15
影响因子：
6.2
通讯作者：
ZACHWIEJA, U
中科院分区：
文献类型：
--
作者：
JACOBS, H;RECHENBACH, D;ZACHWIEJA, U
采用高压氨解法制备了γ′-Fe4N单晶。我们早期发表的研究结果（H. Jacobs和J. Beck， J. Less-Common Met）。γ′-Fe4N在CaTiO3（钙钛矿）结构类型中结晶：x射线单晶衍射数据，空间群Pm (3) / bar m， Z=1, a=3.7900(6)埃，R/R(w) (w=1)=0.017/0.023，N（F-0(2)）大于或等于3 σ (F-0(2))=59，N(var)=6。在工艺炉中制备了epsilon-Fe3N粉末样品。在9 K、室温、609 K条件下，用中子粉末衍射研究了epsilon-Fe3N的晶体结构，晶体结构为六方结构类型：空间群P6(3)22， Z=2, a=4.6982(3)埃，c=4.3789(3)埃，N(F-0)=34, 5个结构参数细化，室温测量R(Profile)=4.43%， R(Bragg)=4.14%。
Single crystals of gamma'-Fe4N were prepared by high pressure ammonolysis. Our earlier published results (H. Jacobs and J. Beck, J. Less-Common Met., 134 (1987) 215) differ from those which are now reported, gamma'-Fe4N crystallizes in the CaTiO3 (perovskite) structure type: X-ray single-crystal diffractometer data, space group Pm (3) over bar m, Z=1 and a=3.7900(6) Angstrom, R/R(w) (w=1)=0.017/0.023,N(F-0(2))greater than or equal to 3 sigma(F-0(2))=59 and N(var)=6. Powder samples of epsilon-Fe3N were prepared in a technical furnace. The crystal structure was studied by neutron powder diffraction at 9 K, room temperature and 609 K. epsilon-Fe3N crystallizes in a hexagonal structure type: space group P6(3)22, Z=2, a=4.6982(3) Angstrom and c=4.3789(3) Angstrom, N(F-0)=34 and 5 structural parameters refined, R(Profile)=4.43%, R(Bragg)=4.14% for the measurement at room temperature.