Magnetic and electrical properties of (DT-TTF) 4 [Au(pds) 2 ] 3
| Autor: | Jorge Morgado, Jaume Veciana, Helena Alves, Manuel Almeida, Isabel Santos, R.T. Henriques, Márcia Duarte, Xavier Ribas, J.C. Dias, Concepció Rovira, Elsa B. Lopes |
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| Rok vydání: | 2003 |
| Předmět: |
Chemistry
Crystal structure Triclinic crystal system Conductivity Magnetic susceptibility law.invention Inorganic Chemistry Hysteresis Crystallography Electrical resistivity and conductivity law Seebeck coefficient Materials Chemistry Physical and Theoretical Chemistry Electron paramagnetic resonance |
| Zdroj: | Polyhedron. 22:2447-2452 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/s0277-5387(03)00210-9 |
| Popis: | The charge transfer salt (DT-TTF)4[Au(pds)2]3 (DT-TTF, Δ2,2′-bithieno[3,4-d]-1,3-dithiol; pds, pyrazine-2,3-diselenate) was prepared and characterised by X-ray diffraction, electrical conductivity, thermoelectric power, magnetic susceptibility and EPR measurements. This compound crystallises in the triclinic system, space group P 1 , with the unit cell parameters a=9.712(5) A, b=13.620(5) A, c=17.169(5) A, α=97.254(5)°, β=106.132(5)°, γ=95.956(5)°, V=2141.10(15) A3, Z=1. Its crystal structure consists of a bidimensional network of DT-TTF tetramers and orthogonal anions. The electrical properties indicate it is a small gap semiconductor (2Δ=190 meV), with a room temperature conductivity of σRT=2 S cm−1. The electrical and magnetic properties reveal two types of transitions occurring upon cooling. The first, at 238 K, as a second order change to a large gap semiconducting state and, a lower transition, of first order type, with a large hysteresis between 210 and 150 K, probably associated with a larger structural change in the DT-TTF network. |
| Databáze: | OpenAIRE |
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