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  Two polymorphs of a new intermetallic Ce2Rh2Ga – crystal structure and physical properties

Nesterenko, S., Tursina, A., Pasturel, M., Xhakaza, S., & Strydom, A. (2020). Two polymorphs of a new intermetallic Ce2Rh2Ga – crystal structure and physical properties. Journal of Alloys and Compounds, 844: 155570, pp. 1-11. doi:10.1016/j.jallcom.2020.155570.

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 Creators:
Nesterenko, Sergey1, Author
Tursina, Anna1, Author
Pasturel, Mathieu1, Author
Xhakaza, Sindisiwe1, Author
Strydom, André2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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Free keywords: Cerium intermetallics, Crystal structure, Gallides, Magnetic properties
 Abstract: We report on the synthesis and physical properties of the new ternary intermetallic Ce2Rh2Ga. Its formation and dimorphism have been investigated by powder and single crystal X-ray diffractometry, as well as by differential thermal analyses. LT- and HT-Ce2Rh2Ga can be obtained by the chosen respective thermal treatment. The high-temperature form (HT-Ce2Rh2Ga), stable above 864(5)°C, is orthorhombic La2Ni3-type [Cmce, oS20, a = 5.851(2) Å, b = 9.6184(19) Å, c = 7.4871(17) Å, V = 421.3(2) Å3]; the low-temperature form (LT-Ce2Rh2Ga), stable below this temperature, is monoclinic Pr2Co2Al- (Ca2Ir2Si-) type [C2/c, mS20, a = 10.0903(6) Å, b = 5.6041(3) Å, c = 7.8153(4) Å, β = 104.995(3)°, V = 426.88(4) Å3]. The magnetic measurements were conducted on two different samples, namely on the LT-Ce2Rh2Ga and the other on the HT-Ce2Rh2Ga sample. The HT-Ce2Rh2Ga compound is found to exhibit a phase transition at 128.5 K. By virtue of the sharp peak anomaly in the temperature dependence of the magnetic susceptibility this phase transition is plausibly of antiferromagnetic origin, but occurs at a remarkably high temperature compared to what is typical for Ce binary and ternary compounds. LT-Ce2Rh2Ga has a ground state of ferromagnetic nature which sets in at a paramagnetic-to-ferromagnetic phase transition at 5.2 K. © 2020 Elsevier B.V.

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Language(s): eng - English
 Dates: 2020-06-252020-06-25
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jallcom.2020.155570
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Title: Journal of Alloys and Compounds
  Abbreviation : J. Alloy. Comp.
Source Genre: Journal
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Publ. Info: Lausanne, Switzerland : Elsevier B.V.
Pages: - Volume / Issue: 844 Sequence Number: 155570 Start / End Page: 1 - 11 Identifier: ISSN: 0925-8388
CoNE: https://pure.mpg.de/cone/journals/resource/954925567746