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Order and disorder in the modulated phase hp-Mg9Ge5.1

Akselrud, Lev ; Prots, Yurii ; Hübner, Julia Maria LU ; Burkhardt, Ulrich ; Schnelle, Walter ; Grin, Yuri and Schwarz, Ulrich (2022) In Zeitschrift fur Anorganische und Allgemeine Chemie 648(10).
Abstract

Single crystals of Mg9Ge5.1(2) were obtained at a pressure of 5 GPa in the temperature range 723 to 1273 K. The metastable high-pressure phase exhibits a crystal structure, which may be described as a host-guest variety of an UCl3-type framework. The atomic arrangement is characterized by a host crystal structure Mg9Ge3 with disordered germanium guests (≈2 Ge per formula unit) in the channels. The composite arrangement undergoes incommensurate modulation. Upon heating at ambient pressure, the phase transforms into the thermodynamically stable compounds Mg2Ge and Ge at 496(5) K. Measurements of the magnetic susceptibility indicate diamagnetic behavior between 75 and 350... (More)

Single crystals of Mg9Ge5.1(2) were obtained at a pressure of 5 GPa in the temperature range 723 to 1273 K. The metastable high-pressure phase exhibits a crystal structure, which may be described as a host-guest variety of an UCl3-type framework. The atomic arrangement is characterized by a host crystal structure Mg9Ge3 with disordered germanium guests (≈2 Ge per formula unit) in the channels. The composite arrangement undergoes incommensurate modulation. Upon heating at ambient pressure, the phase transforms into the thermodynamically stable compounds Mg2Ge and Ge at 496(5) K. Measurements of the magnetic susceptibility indicate diamagnetic behavior between 75 and 350 K.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
germanium, high-pressure synthesis, Magnesium, modulated composite
in
Zeitschrift fur Anorganische und Allgemeine Chemie
volume
648
issue
10
article number
e202100381
publisher
Wiley-Blackwell
external identifiers
  • scopus:85127670935
ISSN
0044-2313
DOI
10.1002/zaac.202100381
language
English
LU publication?
yes
id
ec311ec7-ced7-4b14-9393-21b4403cd8e4
date added to LUP
2022-06-28 14:40:48
date last changed
2023-11-19 20:38:48
@article{ec311ec7-ced7-4b14-9393-21b4403cd8e4,
  abstract     = {{<p>Single crystals of Mg<sub>9</sub>Ge<sub>5.1(2)</sub> were obtained at a pressure of 5 GPa in the temperature range 723 to 1273 K. The metastable high-pressure phase exhibits a crystal structure, which may be described as a host-guest variety of an UCl<sub>3</sub>-type framework. The atomic arrangement is characterized by a host crystal structure Mg<sub>9</sub>Ge<sub>3</sub> with disordered germanium guests (≈2 Ge per formula unit) in the channels. The composite arrangement undergoes incommensurate modulation. Upon heating at ambient pressure, the phase transforms into the thermodynamically stable compounds Mg<sub>2</sub>Ge and Ge at 496(5) K. Measurements of the magnetic susceptibility indicate diamagnetic behavior between 75 and 350 K.</p>}},
  author       = {{Akselrud, Lev and Prots, Yurii and Hübner, Julia Maria and Burkhardt, Ulrich and Schnelle, Walter and Grin, Yuri and Schwarz, Ulrich}},
  issn         = {{0044-2313}},
  keywords     = {{germanium; high-pressure synthesis; Magnesium; modulated composite}},
  language     = {{eng}},
  number       = {{10}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Zeitschrift fur Anorganische und Allgemeine Chemie}},
  title        = {{Order and disorder in the modulated phase hp-Mg<sub>9</sub>Ge<sub>5.1</sub>}},
  url          = {{http://dx.doi.org/10.1002/zaac.202100381}},
  doi          = {{10.1002/zaac.202100381}},
  volume       = {{648}},
  year         = {{2022}},
}