Spectroscopic study ofβ-Ni(OH)2 under pressure |
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Authors: | Chitra Murli V Sugandhi Nandini Garg Surinder M Sharma S K Sikka |
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Institution: | (1) High Pressure Physics Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India;(2) Spectroscopy Division, Bhabha Atomic Research Centre, 400 085 Mumbai, India |
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Abstract: | Infrared absorption and Raman study ofβ-Ni(OH)2 has been carried out up to 25 GPa and 33 GPa, respectively. The frequency ofA
2u
internal antisymmetric stretching O-H mode decreases linearly with pressure at a rate of −0.7 cm−1/GPa. The FWHM of this mode increases continuously with pressure and reaches a value of ∼ 120 cm−1 around 25 GPa. There was no discernible change observed in the frequency and width of the symmetric stretchingA
1g
O-H Raman mode up to 33 GPa. The constancy of the Raman mode is taken as a signature of the repulsion produced by H-H contacts
in this material under pressure. Lack of any discontinuity in these modes suggests that there is no phase transition in this
material in the measured pressure range. |
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Keywords: | β -Ni(OH)2 phase transition infrared absorption Raman study high pressure |
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