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Article: Direct methods in superspace. I. Preliminary theory and test on the determination of incommensurate modulated structures

TitleDirect methods in superspace. I. Preliminary theory and test on the determination of incommensurate modulated structures
Authors
Issue Date1987
PublisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0108-7673&site=1
Citation
Acta Crystallographica Section A, 1987, v. 43, p. 820-824 How to Cite?
AbstractThe validity of the Sayre equation [Sayre (1952). Acta Cryst. 5, 60-65] for (3 + n)-dimensional periodic structures is examined. A practical procedure is proposed for the determination of incommensurate modulated structures; this is an extension of the direct method previously proposed for solving superstructures [Fan Hai-fu, He Lao, Qian Jin-zi & Liu Shi- xiang (1978). Acta Phys. Sin. 27, 554-558]. With the newly proposed method, the phase problem for the main as well as the satellite reflections can be solved directly without making particular assumptions about the modulation. A known incommensurate modulated structure, -Na2CO3, was used in the test. Satisfactory results were obtained.
Persistent Identifierhttp://hdl.handle.net/10722/138621
ISSN
2014 Impact Factor: 2.325
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorHao, Qen_US
dc.contributor.authorLiu, YWen_US
dc.contributor.authorFan, HFen_US
dc.date.accessioned2011-09-02T06:49:23Z-
dc.date.available2011-09-02T06:49:23Z-
dc.date.issued1987en_US
dc.identifier.citationActa Crystallographica Section A, 1987, v. 43, p. 820-824en_US
dc.identifier.issn0108-7673en_US
dc.identifier.urihttp://hdl.handle.net/10722/138621-
dc.description.abstractThe validity of the Sayre equation [Sayre (1952). Acta Cryst. 5, 60-65] for (3 + n)-dimensional periodic structures is examined. A practical procedure is proposed for the determination of incommensurate modulated structures; this is an extension of the direct method previously proposed for solving superstructures [Fan Hai-fu, He Lao, Qian Jin-zi & Liu Shi- xiang (1978). Acta Phys. Sin. 27, 554-558]. With the newly proposed method, the phase problem for the main as well as the satellite reflections can be solved directly without making particular assumptions about the modulation. A known incommensurate modulated structure, -Na2CO3, was used in the test. Satisfactory results were obtained.-
dc.publisherWiley-Blackwell Publishing, Inc.. The Journal's web site is located at http://www.wiley.com/bw/journal.asp?ref=0108-7673&site=1en_US
dc.relation.ispartofActa Crystallographica Section Aen_US
dc.titleDirect methods in superspace. I. Preliminary theory and test on the determination of incommensurate modulated structuresen_US
dc.typeArticleen_US
dc.identifier.emailHao, Q: qhao@hku.hken_US
dc.identifier.authorityHao, Q=rp01332en_US
dc.identifier.doi10.1107/s0108767387098465en_US
dc.identifier.volume43en_US
dc.identifier.spage820en_US
dc.identifier.epage824en_US
dc.identifier.isiWOS:A1987K823600012-

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