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Synthesis, structure and physical properties of layered semiconductors MCuFCh (M=Sr, Eu, Ch=S, Se)

✍ Scribed by Eiji Motomitsu; Hiroshi Yanagi; Toshio Kamiya; Masahiro Hirano; Hideo Hosono

Book ID: 104029553
Publisher: Elsevier Science
Year: 2006
Tongue: English
Weight: 357 KB
Volume: 179
Category: Article
ISSN: 0022-4596
DOI: 10.1016/j.jssc.2006.02.031

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✦ Synopsis

Effects of open shell cations on magnetic, optical and carrier transport properties were examined for layered wide bandgap semiconductors MCuFCh (M ¼ Sr, Eu, Ch ¼ S, Se). Single-phase MCuFCh powder and ceramic samples were synthesized by solid-state reactions. The crystal structures refined by the Rietveld analyzes revealed that all the materials have the space group P4=nmm, indicating that the samples have the same crystal structure as that of layered oxychalcogenides LaCuOCh, and cation vacancies of several percent were present for Cu + and Eu 2+ sites in EuCuFCh. Thermopower measurements revealed that both SrCuFCh and EuCuFCh were p-type semiconductors. Degenerate conduction was observed for EuCuFCh with conductivities 41 S cm À1 , whereas SrCuFCh exhibited thermally activated behavior. The optical band gaps of SrCuFS and SrCuFSe estimated were approximately 3.0 and 2.7 eV, respectively, and those of EuCuFCh were $2 eV. Temperature dependence of magnetic susceptibilities of EuCuFCh followed the Curie-Weiss law down to 5 K and the samples did not show any transition to a magnetic ordering phase.

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