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首页> 外文期刊>Acta Crystallographica, Section B. Structural Science >On the crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel. III. Neutron diffraction study on the ordered Cr2N superstructure
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On the crystal structure of Cr2N precipitates in high-nitrogen austenitic stainless steel. III. Neutron diffraction study on the ordered Cr2N superstructure

机译:Cr2N的晶体结构在高氮奥氏体不锈钢中析出。三, Cr2N有序超结构的中子衍射研究

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摘要

The ordered structure of Cr2N precipitates in high-nitrogen austenitic steel was investigated utilizing high-resolution neutron powder diffractometry (HRPD). On the basis of the Rietveld refinement of neutron diffraction patterns, the ordered Cr2N superstructure was confirmed to be trigonal (space group P31m), with lattice parameters a = 4.800 (4) and c = 4.472 (5) A, as suggested in previous transmission electron microscopy studies [Lee, Oh, Han, Lee, Kim & Takaki ( 2005). Acta Cryst. B61, 137-144; Lee, Kim & Takaki ( 2006). Acta Cryst. B62, 190-196]. The occupancies of the N atoms in four crystallographic sites [1(a), 1(b), 2(d) and 2(c) Wyckoff sites] were determined to be 1.00 (5), 0.0, 0.74 (9) and 0.12 (3), respectively, reflecting a partial disordering of N atoms along the c axis. The position of the metal atom was specified to be x = 0.346 (8) and z = 0.244 (6), corresponding to a deviation from the ideal position (x = 0.333 and z = 0.250). This deviation caused the (1/31/30)-type superlattice reflection to appear. A comparison between the ideal and measured crystal structures of Cr2N was performed using a computer simulation of selected-area diffraction patterns.
机译:利用高分辨率中子粉末衍射法(HRPD)研究了高氮奥氏体钢中Cr2N析出物的有序结构。根据中子衍射图的Rietveld细化,证实了有序的Cr2N超结构是三角形的(空间群P31m),晶格参数a = 4.800(4)和c = 4.472(5)A,如先前的传输所示电子显微镜研究[Lee,Oh,Han,Lee,Kim&Takaki(2005)。 Acta Cryst。 B61,137-144; Lee,Kim&Takaki(2006年)。 Acta Cryst。 B62,190-196]。 N个原子在四个晶体学位点[1(a),1(b),2(d)和2(c)Wyckoff位点]的占有率分别确定为1.00(5),0.0、0.74(9)和0.12 (3)分别反映了N原子沿c轴的局部无序。金属原子的位置指定为x = 0.346(8)和z = 0.244(6),对应于与理想位置的偏差(x = 0.333和z = 0.250)。该偏差导致出现(1/31/30)型超晶格反射。 Cr2N的理想晶体结构和测得的晶体结构之间的比较是使用选定区域衍射图样的计算机模拟进行的。

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