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Cu5In3-Cu3In2 Revisited

Lidin, Sven LU and Piao, Shuying (2018) In European Journal of Inorganic Chemistry 2018(31). p.3548-3553
Abstract

The η-phase field of the Cu–In system is unusually rich and shows wealth of phases that are all related to the B8 (NiAs/Ni2In) type. Previous electron diffraction work has revealed extensive super structure ordering; in this study, we report single crystal diffraction experiments on high-quality samples of two of the phases in the system, ht1-Cu5In3 and ht2-Cu5In3. Both these phases constitute super structures, caused by the ordering of interstitials. The structure ht2-Cu5In3 is a relatively simple structure with a bidimensional modulation but where only first order satellites are visible, indicating incomplete order whereas ht1-Cu5In3 displays many... (More)

The η-phase field of the Cu–In system is unusually rich and shows wealth of phases that are all related to the B8 (NiAs/Ni2In) type. Previous electron diffraction work has revealed extensive super structure ordering; in this study, we report single crystal diffraction experiments on high-quality samples of two of the phases in the system, ht1-Cu5In3 and ht2-Cu5In3. Both these phases constitute super structures, caused by the ordering of interstitials. The structure ht2-Cu5In3 is a relatively simple structure with a bidimensional modulation but where only first order satellites are visible, indicating incomplete order whereas ht1-Cu5In3 displays many high order satellites and the refined structure exhibit nearly perfect order with step-function-like occupancy domains. The refinement of the structure of ht1-Cu5In3 is challenging for several reasons. It is difficult to integrate the data because of the unusual combination of very closely spaced satellites caused by q-vectors close to (1/3 1/3 0) and a paucity of reflections in total, caused by the small substructure. A second challenge is the refinement of what amounts to a two-dimensional step function. In effect, the shape of a two-dimensional occupation domain is defined by a Fourier series and the problem of defining that shape is non-trivial.

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author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Copper, Indium, Intermetallic phases, Modulated structure
in
European Journal of Inorganic Chemistry
volume
2018
issue
31
pages
6 pages
publisher
John Wiley & Sons Inc.
external identifiers
  • scopus:85050954307
ISSN
1434-1948
DOI
10.1002/ejic.201800316
language
English
LU publication?
yes
id
b0fa85f0-fb22-4834-9d3e-c3304d261c3c
date added to LUP
2018-09-18 15:44:06
date last changed
2022-03-09 20:38:45
@article{b0fa85f0-fb22-4834-9d3e-c3304d261c3c,
  abstract     = {{<p>The η-phase field of the Cu–In system is unusually rich and shows wealth of phases that are all related to the B8 (NiAs/Ni2In) type. Previous electron diffraction work has revealed extensive super structure ordering; in this study, we report single crystal diffraction experiments on high-quality samples of two of the phases in the system, ht1-Cu<sub>5</sub>In<sub>3</sub> and ht2-Cu<sub>5</sub>In<sub>3</sub>. Both these phases constitute super structures, caused by the ordering of interstitials. The structure ht2-Cu<sub>5</sub>In<sub>3</sub> is a relatively simple structure with a bidimensional modulation but where only first order satellites are visible, indicating incomplete order whereas ht1-Cu<sub>5</sub>In<sub>3</sub> displays many high order satellites and the refined structure exhibit nearly perfect order with step-function-like occupancy domains. The refinement of the structure of ht1-Cu<sub>5</sub>In<sub>3</sub> is challenging for several reasons. It is difficult to integrate the data because of the unusual combination of very closely spaced satellites caused by q-vectors close to (1/3 1/3 0) and a paucity of reflections in total, caused by the small substructure. A second challenge is the refinement of what amounts to a two-dimensional step function. In effect, the shape of a two-dimensional occupation domain is defined by a Fourier series and the problem of defining that shape is non-trivial.</p>}},
  author       = {{Lidin, Sven and Piao, Shuying}},
  issn         = {{1434-1948}},
  keywords     = {{Copper; Indium; Intermetallic phases; Modulated structure}},
  language     = {{eng}},
  month        = {{08}},
  number       = {{31}},
  pages        = {{3548--3553}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{European Journal of Inorganic Chemistry}},
  title        = {{Cu<sub>5</sub>In<sub>3</sub>-Cu<sub>3</sub>In<sub>2</sub> Revisited}},
  url          = {{http://dx.doi.org/10.1002/ejic.201800316}},
  doi          = {{10.1002/ejic.201800316}},
  volume       = {{2018}},
  year         = {{2018}},
}