We present a combined high pressure Ni K-edge x-ray absorption and Raman spectroscopic investigation of β-Ni(OH)2. Extended xray absorption fine structure analysis reveals a progressive shrinking of the Ni–O and Ni–Ni bond distances with pressure. As pressure is increased, Raman data show a continuous hardening of the phonon modes associated with the vibration of Ni–O sublattice, whereas a systematic frequency softening is displayed by the hydroxyl (O–H) symmetric stretching mode. This contrasting behavior implies a gradual development of a lattice instability with pressure in nickel hydroxide. Under pressure hydrogen bonds become increasingly unstable mainly due to the displacement of H atoms around the Ni–O axis inducing a locallattice instability may explain the structural, Raman and x-ray absorption results

Local structure investigation of β-Ni(OH)2 under pressure using combined Raman and Ni K-edge extended x-ray absorption fine structure studies / Marini, C; Joseph, B.; Caramazza, Simone; Bendele, M.; Kantor, I.; Lotti, P.; Mathon, O.; Pascarelli, S.; Postorino, Paolo; Capitani, F.. - In: HIGH PRESSURE RESEARCH. - ISSN 0895-7959. - ELETTRONICO. - 37:1(2017), pp. 1-10. [10.1080/08957959.2016.1269174]

Local structure investigation of β-Ni(OH)2 under pressure using combined Raman and Ni K-edge extended x-ray absorption fine structure studies

CARAMAZZA, SIMONE;POSTORINO, Paolo;Capitani, F.
2017

Abstract

We present a combined high pressure Ni K-edge x-ray absorption and Raman spectroscopic investigation of β-Ni(OH)2. Extended xray absorption fine structure analysis reveals a progressive shrinking of the Ni–O and Ni–Ni bond distances with pressure. As pressure is increased, Raman data show a continuous hardening of the phonon modes associated with the vibration of Ni–O sublattice, whereas a systematic frequency softening is displayed by the hydroxyl (O–H) symmetric stretching mode. This contrasting behavior implies a gradual development of a lattice instability with pressure in nickel hydroxide. Under pressure hydrogen bonds become increasingly unstable mainly due to the displacement of H atoms around the Ni–O axis inducing a locallattice instability may explain the structural, Raman and x-ray absorption results
EXAFS; high pressure; RAMAN; Condensed Matter Physics
01 Pubblicazione su rivista::01a Articolo in rivista
Local structure investigation of β-Ni(OH)2 under pressure using combined Raman and Ni K-edge extended x-ray absorption fine structure studies / Marini, C; Joseph, B.; Caramazza, Simone; Bendele, M.; Kantor, I.; Lotti, P.; Mathon, O.; Pascarelli, S.; Postorino, Paolo; Capitani, F.. - In: HIGH PRESSURE RESEARCH. - ISSN 0895-7959. - ELETTRONICO. - 37:1(2017), pp. 1-10. [10.1080/08957959.2016.1269174]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/927474
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