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Complexity of quasicrystal approximants —The RECd6 and RE13(Zn/Cd)~58 systems
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is focused on the synthesis and structural determination of a series of quasicrystal approximants in the RE13Zn~58 (RE = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu), Ce13Cd~58 and RECd6 (RE = Tb, Ho, Er, Tm and Lu) systems. Structural studies were performed by single crystal X-ray diffraction methods.

The RECd6 phases are 1/1 cubic approximants to the stable icosahedral quasicrystals. The structure of quasicrystals cannot be solved by conventional crystallography due to the lack of periodicity in three-dimensional space. On the other hand, quasicrystal approximants exhibit long-range order, which makes their structural determination possible by standard methods. Since they are believed to display the same local arrangement as the quasicrystals, the structures of the quasicrystal approximants play a key role in understanding quasicrystals.

The RE13Zn~58 and Ce13Cd~58 quasicrystal approximants show measurable compositional variations coupled to subtle structural differences. The crystal structures are generally rather more complex than previously reported, and exhibit a number of different ordering and disordering modes.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi , 2007. , 82 p.
Keyword [en]
Rare-earth, Quasicrystal approximant, order and disorder
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-7203ISBN: 978-91-7155-515-1 (print)OAI: oai:DiVA.org:su-7203DiVA: diva2:197852
Public defence
2007-12-19, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
List of papers
1. Structural Study of the Disordered RECd6 Quasicrystal Approximants (RE = Tb, Ho, Er, Tm and Lu)
Open this publication in new window or tab >>Structural Study of the Disordered RECd6 Quasicrystal Approximants (RE = Tb, Ho, Er, Tm and Lu)
2006 In: Z. Naturforsch., ISSN 0932-0776, Vol. 61b, no 6, 644-649 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24589 (URN)
Note
Part of urn:nbn:se:su:diva-7203Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
2. Complexity of Hexagonal Approximants in the RE13Zn~58
Open this publication in new window or tab >>Complexity of Hexagonal Approximants in the RE13Zn~58
2006 In: Z. Kristallogr., ISSN 0044-2968, Vol. 221, no 5-7, 391-401 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24590 (URN)
Note
Part of urn:nbn:se:su:diva-7203Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
3. Quasicrystal approximant Ho13Zn58+δ: an incommensurate modulated tunnel structure
Open this publication in new window or tab >>Quasicrystal approximant Ho13Zn58+δ: an incommensurate modulated tunnel structure
2007 In: Philosophical Magazine, ISSN 1478-6435, Vol. 87, 2693-2699 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24591 (URN)000248123000012 ()
Note
Part of urn:nbn:se:su:diva-7203Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
4. The incommensurately modulated structure of Ho13Zn58: a little order goes a long way
Open this publication in new window or tab >>The incommensurately modulated structure of Ho13Zn58: a little order goes a long way
In: Solid State Sci.Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-24592 (URN)
Note
Part of urn:nbn:se:su:diva-7203Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
5. Occupation waves the way you’ve never seen them: the orthorhombic quasicrystal approximants RE13Zn58+δ (RE=Ho, Er, Tm and Lu)
Open this publication in new window or tab >>Occupation waves the way you’ve never seen them: the orthorhombic quasicrystal approximants RE13Zn58+δ (RE=Ho, Er, Tm and Lu)
2007 In: Inorganic Chemistry, ISSN 0020-1669, Vol. 46, no 16, 6452-6463 p.Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24593 (URN)000248345200035 ()
Note
Part of urn:nbn:se:su:diva-7203Available from: 2007-11-28 Created: 2007-11-21Bibliographically approved
6. All the disorder mechanisms in the 13:58 phases come together. Out of the modulated confusion rises the remarkable phase Ce12.60Cd58.68(2)
Open this publication in new window or tab >>All the disorder mechanisms in the 13:58 phases come together. Out of the modulated confusion rises the remarkable phase Ce12.60Cd58.68(2)
2008 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 47, no 3, 1079-1086 p.Article in journal (Refereed) Published
Abstract [en]

The compound Ce12.60Cd58.68(2) is a metrically commensurate representative of the incommensurately modulated phase Ce13Cd57+delta. It is most likely a lock-in phase. The structure, which was solved using seeding of the modulation from those positions most affected as well as direct solution by charge flipping, represents a rare case of ordering in a family of structures where disorder is the rule. The disorder mechanisms, known from other RE13Zn/Cd-58 phases, order in this phase to give rise to a remarkable interplay between interstitials and vacancies. The compound crystallizes in the super space group Ccmm(alpha 00)00s (standard setting Amma(00 gamma)s00) with cell parameters a 27.2789(14) angstrom, b = 15.7592(1) angstrom, and c = 15.5816(4) angstrom and a q vector close to 2/3.

National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-24594 (URN)10.1021/ic701962b (DOI)000252714500041 ()
Available from: 2007-11-28 Created: 2007-11-21 Last updated: 2017-12-13Bibliographically approved

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