High-pressure phase transitions in adamantane

Vijayakumar, V. ; Garg, Alka B. ; Godwal, B. K. ; Sikka, S. K. (2000) High-pressure phase transitions in adamantane Chemical Physics Letters, 330 (3-4). pp. 275-280. ISSN 0009-2614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00092...

Related URL: http://dx.doi.org/10.1016/S0009-2614(00)01074-5


We report angle dispersive X-ray diffraction (ADXRD) measurements on adamantane carried out at SPRING-8 to the pressures of 25 GPa. The tetragonal phase observed at 0.5 GPa remains stable up to 12.5 GPa. In this pressure range the intermolecular hydrogen separation reduces from 2.37 to1.87 Å with relative angle of rotation of the two molecules increasing from 8.5° to 10.5° in agreement with values from energy minimization. At 16 GPa, the diffraction pattern could be indexed either by a tetragonal or a monoclinic cell. Beyond 22 GPa only monoclinic cell indexes the patterns. The present findings corroborate the earlier Raman results.

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Deposited On:13 Nov 2010 13:57
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