Cu5In3-Cu3In2 Revisited
(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.
(Less)
- author
- Lidin, Sven LU and Piao, Shuying
- organization
- publishing date
- 2018-08-23
- 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}}, }