Crystal growth and characterization of the antiperovskite superconductor MgC1-xNi3-y

Zhigadlo, Nikolai D. (2019). Crystal growth and characterization of the antiperovskite superconductor MgC1-xNi3-y. Journal of Crystal Growth, 520, pp. 56-61. Elsevier 10.1016/j.jcrysgro.2019.05.021

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By varying the parameters controlling the growth of crystals, including the thermodynamic variables, such as temperature, pressure, and reagent composition and the kinetic factors, namely reaction time and cooling rate, we found the most appropriate conditions for the reproducible growth of the nonstoichiometric antiperovskite superconductors MgC1-xNi3-y. Bulk single crystals of MgC1-xNi3-y were grown by a self-flux method at 3 GPa and 1700 °C using a mixture of Mg, C, and Ni powders in a molar ratio 1:1.25:3. The as-grown black colored crystals, mechanically extracted from solidified lump, exhibit various irregular three dimensional shapes, with flat surfaces and maximum dimensions up to ∼ (1–1.2) × (0.8–1.0) × (0.4–0.6) mm3. Single-crystal X-ray diffraction refinement confirmed the high structural perfection of the grown crystals [Space group Pm-3m, No 221, Z = 1, a = 3.7913(1) Å, and V = 54.5(1) Å3], but also the presence of deficiencies on the C and Ni sites. Temperature-dependent magnetization measurements showed a single-phase behaviour with a critical temperature (Tc) ranging between 6.3 and 6.8 K due to the slightly different C and Ni stoichiometries of MgC1-xNi3-y crystals. The growth of relatively large crystals reported here could provide a helpful guidance for further syntheses of various 3d-based antiperovskite intermetallics under high pressure.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Departement of Chemistry and Biochemistry

UniBE Contributor:

Zhigadlo, Nikolai

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

0022-0248

Publisher:

Elsevier

Language:

English

Submitter:

Franziska Bornhauser-Rufer

Date Deposited:

26 Feb 2020 11:16

Last Modified:

26 Feb 2020 11:19

Publisher DOI:

10.1016/j.jcrysgro.2019.05.021

BORIS DOI:

10.7892/boris.140617

URI:

https://boris.unibe.ch/id/eprint/140617

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