Structural phase transitions in Zn(CN)2 under high pressures |
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Authors: | HK Poswal AK Tyagi SK Deb |
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Institution: | a High Pressure Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India b Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India c Synchrotron Trieste-Elettra, S. S. -14 Km 163, 5 in Area Science Park, 34012 Basovizza, Trieste, Italy |
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Abstract: | High pressure behavior of zinc cyanide (Zn(CN)2) has been investigated with the help of synchrotron-based X-ray diffraction measurements. Our studies reveal that under pressure this compound undergoes phase transformations and the structures of the new phases depend on whether the pressure is hydrostatic or not. Under hydrostatic conditions, Zn(CN)2 transforms from cubic to orthorhombic to cubic-II to amorphous phases. In contrast, the non-hydrostatic pressure conditions drive the ambient cubic phase to a partially disordered crystalline phase, which eventually evolves to a substantially disordered phase. The final disordered phase in the latter case is distinct from the amorphous phase observed under the hydrostatic pressures. |
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Keywords: | High pressure X-ray diffraction Structural phase transition Negative thermal expansion |
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