%0 Journal Article %1 WOS:000424854300013 %A Saraiva, G D %A Jr., J A Lima %A de Sousa, F F %A da Silva, J H %A Neto, V O Sousa %A de Castro, A J Ramiro %A Filho, J Mendes %C PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS %D 2018 %I ELSEVIER SCIENCE BV %J VIBRATIONAL SPECTROSCOPY %K Phase Raman molybdenum; scattering} transitions; {Potassium %P 89-94 %R 10.1016/j.vibspec.2016.12.009 %T Pressure dependent Raman studies in the K2Mo2O7 center dot H2O crystal %V 94 %X The pressure dependent Raman scattering in the potassium molybdenum oxide hydrate crystal, K2Mo2O7 center dot H2O, was measured. The high pressure Raman study showed, that the compound remains in the triclinic structure within the 0.0-3.81 GPa range and undergoes a structural phase transition between 3.81 and 4.13 GPa. This particular phase transition is most likely connected with changes in the Raman spectrum, in which the number of modes associated originally with the stretching vibrations in the MoO5 and MoO6 units is increased. However, the phase at atmospheric pressure shows bands due to the presence of only one equivalent site, while in the high-pressure phase, two bands are associated with the stretching modes. Continuing the pressure evolution up to 17.04 GPa, two further phase transitions occurred in this crystal in the 6.3-8.1 GPa and the 12.3-14.0 GPa range, respectively. The Raman spectra measured at about 17.04 GPa presented a crystal structure, which experienced a pre-amorphization with a total loss of all lattice modes. This particular result is indicative that this material may have undergone a complete amorphization at pressures larger than 17.04 GPa. Then, the reversible character in the triclinic P-1 (C-i(1)) structure was recovered after releasing the pressure. (C) 2016 Elsevier B.V. All rights reserved.

@article{WOS:000424854300013, abstract = {The pressure dependent Raman scattering in the potassium molybdenum oxide hydrate crystal, K2Mo2O7 center dot H2O, was measured. The high pressure Raman study showed, that the compound remains in the triclinic structure within the 0.0-3.81 GPa range and undergoes a structural phase transition between 3.81 and 4.13 GPa. This particular phase transition is most likely connected with changes in the Raman spectrum, in which the number of modes associated originally with the stretching vibrations in the MoO5 and MoO6 units is increased. However, the phase at atmospheric pressure shows bands due to the presence of only one equivalent site, while in the high-pressure phase, two bands are associated with the stretching modes. Continuing the pressure evolution up to 17.04 GPa, two further phase transitions occurred in this crystal in the 6.3-8.1 GPa and the 12.3-14.0 GPa range, respectively. The Raman spectra measured at about 17.04 GPa presented a crystal structure, which experienced a pre-amorphization with a total loss of all lattice modes. This particular result is indicative that this material may have undergone a complete amorphization at pressures larger than 17.04 GPa. Then, the reversible character in the triclinic P-1 (C-i(1)) structure was recovered after releasing the pressure. (C) 2016 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS}, author = {Saraiva, G D and Jr., J A Lima and de Sousa, F F and da Silva, J H and Neto, V O Sousa and de Castro, A J Ramiro and Filho, J Mendes}, biburl = {https://www.bibsonomy.org/bibtex/29a94b98d1583cec6cfe7e6246df9260f/ppgfis_ufc_br}, doi = {10.1016/j.vibspec.2016.12.009}, interhash = {3c49f0378d5e97d67337b3c3577b2b38}, intrahash = {9a94b98d1583cec6cfe7e6246df9260f}, issn = {0924-2031}, journal = {VIBRATIONAL SPECTROSCOPY}, keywords = {Phase Raman molybdenum; scattering} transitions; {Potassium}, pages = {89-94}, publisher = {ELSEVIER SCIENCE BV}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Pressure dependent Raman studies in the K2Mo2O7 center dot H2O crystal}, tppubtype = {article}, volume = 94, year = 2018 }