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Ultrahigh‐pressure effects in metallo‐organics
Author(s) -
Kagoshima Seiichi,
Kondo Ryusuke,
Matsushita Nobuyuki,
Higa Momoka,
Ovsyannikov Sergey V.,
Shaydarova Nadezhda A.,
Shchennikov Vladimir V.,
Manakov Andrey Y.,
Likhacheva Anna Y.
Publication year - 2007
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200672530
Subject(s) - seebeck coefficient , compressibility , thermoelectric effect , diffraction , electrical resistivity and conductivity , condensed matter physics , high pressure , chemistry , crystallography , materials science , powder diffraction , crystal structure , thermodynamics , optics , physics , quantum mechanics
The results are reported of the pressure ( P ) dependence of the electrical resistance ( R ), the thermoelectric power (Seebeck effect) ( S ), and compressibility as well as the time dependence of R at fixed P up to 20 GPa for four metallo‐organics based on the BEDT‐TTF (bisethylenedithiolo‐tetrathiofulvalene) group, θ ‐(BEDT‐TTF) 2 CsZn(SCN) 4 , α ‐(BEDT‐TTF) 2 I 3 , β ′‐(BEDT‐TTF) 2 PF 6 , and (BEDT‐TTF)‐TCNQ. X‐ray powder and single‐crystal diffraction studies were also made on θ ‐(BEDT‐TTF) 2 CsZn(SCN) 4 at high pressures up to P ∼ 10 GPa. The R values of all the crystals decreased with pressure up to P ∼ 3–5 GPa (low‐pressure regime), and then the sign of d R /d P inverted (high‐pressure regime). From the investigation of the mechanical and structural properties, these materials were found to have a large compressibility in the low‐pressure regime, and a small one in the high‐pressure region. In θ ‐(BEDT‐TTF) 2 CsZn(SCN) 4 we observed pressure‐ induced reversible degradation (amorphization) in structure without a solid‐phase reaction. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)