Polymorphic forms of Rb2Te: in-situ high-pressure DAC X-ray diffraction investigations and structure modelling with CASTEP
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Klaus Stöwe
Abstract
We report on high pressure X-ray diffraction investigations of Rb2Te in diamond anvil cells DAC (Mo Kα1 radiation, Rietveld refinement of the diffraction diagrams), which resulted in a polymorphic transformation series for the compound Rb2Te from an anti-fluorite type into an anti-cotunnite type (transition pressure 0.5 GPa) and further on into a Ni2In type structure (transition pressure 1.5 GPa). Among the compounds of the composition A2B Rb2Te has up to now an exceptional position in so far, as this sequence of polymorphic forms is also observed as a high-temperature transformation series. Geometry optimizations on the basis of DFT calculations with the program CASTEP confirmed the phase transitions observed experimentally. Since the anti-cotunnite and the Ni2In type are structurally related — between both structure types there is a group-subgroup relation with the Ni2In type as aristo-type (1st Landau criterion) — the transition between the two types can be characterized as continuous in real space coordinates. According to experimental data as well as results of the CASTEP calculations the phase transition takes place with a discontinuity in the volume versus pressure curve. The geometry optimizations give direct insight in the continuous mechanism of the transition and offer the possibility to compare intermediate structural arrangements with other structures to be discussed in this context, as e.g. the post-cotunnite or the Co2Si structure-type.
© 2004 Oldenbourg Wissenschaftsverlag GmbH
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- Ab initio investigations of TlI-type compounds under high pressure
- Polymorphic forms of Rb2Te: in-situ high-pressure DAC X-ray diffraction investigations and structure modelling with CASTEP
- Electronic structure and bonding in antimony and its high pressure phases
- Metallic high-pressure modifications of main group elements
Articles in the same Issue
- Editorial: High-Pressure Crystallography and Synthesis
- New pressure cell for single-crystal X-ray investigations on diffractometers with area detectors
- High-pressure and high-temperature powder diffraction on molybdenum diphosphide, MoP2
- The effects of pressure, temperature and composition on the crystal structures of α-quartz homeotypes
- High-pressure behavior of sillimanite and kyanite: Compressibility, decomposition and indications of a new high-pressure phase
- Multianvil high-pressure / high-temperature synthesis in solid state chemistry
- Putting the squeeze on NaCl: modelling and simulation of the pressure driven B1-B2 phase transition
- Mechanism of the pressure induced reconstructive transformation of KCl from the NaCl type to the CsCl type structure
- Ab initio investigations of TlI-type compounds under high pressure
- Polymorphic forms of Rb2Te: in-situ high-pressure DAC X-ray diffraction investigations and structure modelling with CASTEP
- Electronic structure and bonding in antimony and its high pressure phases
- Metallic high-pressure modifications of main group elements
