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Single-crystal structure of pyrite-type HP-Pd0.84(1)Se2 prepared by high-pressure/ high-temperature synthesis

  • Elisabeth Selb , Martina Tribus and Gunter Heymann EMAIL logo
Published/Copyright: October 11, 2018
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Abstract

At ambient conditions, PdSe2 dichalcogenides crystallize in the layered PdS2-type structure. If pressure is applied, the coordination number of palladium atoms increases and the three-dimensional pyrite-type structure with octahedral (PdSe6)4− coordination geometry is observed. For the first time, single crystals of a pyrite-type PdSe2 modification could be obtained and characterized, which were grown by multianvil high-pressure/high-temperature synthesis at 7.5 GPa and 1023 K. The crystals show the expected pyrite-type space group Pa3̅ (no. 205) and refinement results of a=613.26(3) pm, R1=0.0233, and wR2=0.0247 (all data) were received for HP-Pd0.84(1)Se2. The single-crystal data revealed significant defect formation on the palladium site with 16% vacancies, which is in line with the orthorhombic PdX2-type high-pressure polymorphs HP-Pd0.94(1)S2 and HP-Pd0.88(1)Se2. The tendency of vacancy formation on the palladium site could also be verified by EDX measurements.

Acknowledgements

We thank Prof. Dr. H. Huppertz for continuous support and usage of all the facilities of the Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck. This work was financially supported by the Tiroler Wissenschaftsfond (TWF); project no: 235863.

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Received: 2018-09-05
Accepted: 2018-09-16
Published Online: 2018-10-11
Published in Print: 2018-12-19

©2018 Walter de Gruyter GmbH, Berlin/Boston

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