Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system
The monoclinic η-phase in the binary Al–Cr system was initially named by Bradley & Lu [Bradley & Lu (1937). J. Inst. Met. 60, 319–337] as having the composition Al11Cr2 (Al:Cr ratio = 5.5:1). Its crystal structure was later refined [Cao & Kuo (2008). J. Alloys Compd. 458, 30, 319–337] to...
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International Union of Crystallography
2020-10-01
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| Online Access: | http://scripts.iucr.org/cgi-bin/paper?S2414314620014121 |
| _version_ | 1819086683319042048 |
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| author | Xu Geng Bin Wen Changzeng Fan |
| author_facet | Xu Geng Bin Wen Changzeng Fan |
| author_sort | Xu Geng |
| collection | DOAJ |
| description | The monoclinic η-phase in the binary Al–Cr system was initially named by Bradley & Lu [Bradley & Lu (1937). J. Inst. Met. 60, 319–337] as having the composition Al11Cr2 (Al:Cr ratio = 5.5:1). Its crystal structure was later refined [Cao & Kuo (2008). J. Alloys Compd. 458, 30, 319–337] to have a slightly lower Al content (Al:Cr ratio = 5.16:1). In the present work, a monoclinic phase with composition Al2.95Cr0.59 (Al:Cr ratio = 5.04:1) was obtained by high-pressure sintering (HPS) of a stoichiometric Al11Cr2 mixture. Structure analysis of this phase, hereafter named η′, revealed a close relationship to the previously reported η-Al11Cr2 structure, but with different mixed-occupied sites. Five fully occupied sites exhibit refined site occupation factors of 0.899 (5), 0.984 (4), 0.977 (5), 0.946 (4) and 0.945 (4) for the corresponding Al atoms. Moreover, there are no split Al sites in the η′-structure as reported for the η-structure. The refined chemical composition of the η′-phase revealed that it comprises two Al atoms fewer and two Cr atoms more than the previously reported η-Al11Cr2 phase. |
| first_indexed | 2024-12-21T21:24:09Z |
| format | Article |
| id | doaj.art-eca80037561446f293ddb811676c7c7e |
| institution | Directory Open Access Journal |
| issn | 2414-3146 |
| language | English |
| last_indexed | 2024-12-21T21:24:09Z |
| publishDate | 2020-10-01 |
| publisher | International Union of Crystallography |
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| spelling | doaj.art-eca80037561446f293ddb811676c7c7e2022-12-21T18:49:49ZengInternational Union of CrystallographyIUCrData2414-31462020-10-01510x20141210.1107/S2414314620014121wm4139Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr systemXu Geng0Bin Wen1Changzeng Fan2State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People's Republic of ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People's Republic of ChinaState Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, People's Republic of ChinaThe monoclinic η-phase in the binary Al–Cr system was initially named by Bradley & Lu [Bradley & Lu (1937). J. Inst. Met. 60, 319–337] as having the composition Al11Cr2 (Al:Cr ratio = 5.5:1). Its crystal structure was later refined [Cao & Kuo (2008). J. Alloys Compd. 458, 30, 319–337] to have a slightly lower Al content (Al:Cr ratio = 5.16:1). In the present work, a monoclinic phase with composition Al2.95Cr0.59 (Al:Cr ratio = 5.04:1) was obtained by high-pressure sintering (HPS) of a stoichiometric Al11Cr2 mixture. Structure analysis of this phase, hereafter named η′, revealed a close relationship to the previously reported η-Al11Cr2 structure, but with different mixed-occupied sites. Five fully occupied sites exhibit refined site occupation factors of 0.899 (5), 0.984 (4), 0.977 (5), 0.946 (4) and 0.945 (4) for the corresponding Al atoms. Moreover, there are no split Al sites in the η′-structure as reported for the η-structure. The refined chemical composition of the η′-phase revealed that it comprises two Al atoms fewer and two Cr atoms more than the previously reported η-Al11Cr2 phase.http://scripts.iucr.org/cgi-bin/paper?S2414314620014121crystal structureal–cr intermetallicshigh-pressure sinteringicosahedra |
| spellingShingle | Xu Geng Bin Wen Changzeng Fan Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system IUCrData crystal structure al–cr intermetallics high-pressure sintering icosahedra |
| title | Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system |
| title_full | Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system |
| title_fullStr | Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system |
| title_full_unstemmed | Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system |
| title_short | Crystal structure of Al2.95Cr0.59, a phase closely related to the η-phase in the binary Al–Cr system |
| title_sort | crystal structure of al2 95cr0 59 a phase closely related to the η phase in the binary al cr system |
| topic | crystal structure al–cr intermetallics high-pressure sintering icosahedra |
| url | http://scripts.iucr.org/cgi-bin/paper?S2414314620014121 |
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