Structure and temperature transformation of SnSe. Stabilization of a new cubic phase Sn4Bi2Se7
Abstract
We have studied the evolution of the orthorhombic structure of SnSe (space group Pnma) as a function of the temperature. The structure slightly changes below 723 K. From 723 K to 803 K some modifications take place and at temperatures higher than 813 K the structure becomes close to the TlI-type structure. The new space group is Cmcm. The transformation to NaCl structure can not be observed because it melts before. Mössbauer spectra confirm the presence of Sn(II) in a distorted coordination polyhedron. The study of the Sn1−3xBi2xSe series has let us to identify a new phase Sn4Bi2Se7, with a NaCl-type structure, close to the theoretical cubic SnSe. A 119Sn Mössbauer study shows that the octahedral coordination polyhedra are slightly distorted at low temperature. X-ray diffraction confirms that this distortion is a local effect.
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Artikel in diesem Heft
- On the self-similarities of two icosahedral patterns
- Conformation of single chains of anion-centred edge-sharing tetrahedra
- X-ray and neutron reflectivity
- Anisotropy of Anomalous Scattering: a tool for phase information
- Structure and temperature transformation of SnSe. Stabilization of a new cubic phase Sn4Bi2Se7
- The new heteronuclear cluster cation [GeGa4]8+ in GeGa4S4: a summary of single crystal and mixed crystal studies
- Dimorphic YbPdSn with ZrNiAl and TiNiSi type structure
- The structure of the ternary phase Co2NiAl9 (Y2)
Artikel in diesem Heft
- On the self-similarities of two icosahedral patterns
- Conformation of single chains of anion-centred edge-sharing tetrahedra
- X-ray and neutron reflectivity
- Anisotropy of Anomalous Scattering: a tool for phase information
- Structure and temperature transformation of SnSe. Stabilization of a new cubic phase Sn4Bi2Se7
- The new heteronuclear cluster cation [GeGa4]8+ in GeGa4S4: a summary of single crystal and mixed crystal studies
- Dimorphic YbPdSn with ZrNiAl and TiNiSi type structure
- The structure of the ternary phase Co2NiAl9 (Y2)
