%0 Journal Article %1 WOS:000315760100008 %A Luz-Lima, C %A Batista, J C %A Freire, P T C %A de Sousa, G P %A dos Santos, F E P %A Filho, J Mendes %A Viana, B C %A Saraiva, G D %C RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS %D 2013 %I ELSEVIER %J VIBRATIONAL SPECTROSCOPY %K High Magnesium Phase Raman molybdate; spectroscopy; temperature; transformation} tungstate; {Dipotassium %P 58-65 %R 10.1016/j.vibspec.2012.11.016 %T Temperature-dependent Raman spectroscopy studies of phase transformations in the K2WO4 and the MgMoO4 crystals %V 65 %X Temperature-dependent Raman spectroscopy studies of K2WO4 and MgMoO4 polycrystals were performed in order to obtain information about vibrational and structural changes in these materials as a function of temperature. The stability of the monoclinic phase for both K2WO4 and MgMoO4 samples was assessed and our results indicated that this phase is stable in the 295-723 K and 300-770 K ranges for K2WO4 and MgMoO4, respectively. It was observed that both samples underwent two phase transformations above room temperature. The first phase transformations which occur at about 633 K and 640 K for K2WO4 and MgMoO4, respectively, is most likely connected with weak tilting and/or rotations of WO4/MoO4 tetrahedral units that lead to a disorder in the oxygen sublattice. Raman spectroscopy data also indicated that K2WO4 and MgMoO4 exhibited a first-order phase transition at around 723 K and 770 K, respectively, changing from monoclinic to hexagonal symmetry. (c) 2012 Elsevier B.V. All rights reserved.

@article{WOS:000315760100008, abstract = {Temperature-dependent Raman spectroscopy studies of K2WO4 and MgMoO4 polycrystals were performed in order to obtain information about vibrational and structural changes in these materials as a function of temperature. The stability of the monoclinic phase for both K2WO4 and MgMoO4 samples was assessed and our results indicated that this phase is stable in the 295-723 K and 300-770 K ranges for K2WO4 and MgMoO4, respectively. It was observed that both samples underwent two phase transformations above room temperature. The first phase transformations which occur at about 633 K and 640 K for K2WO4 and MgMoO4, respectively, is most likely connected with weak tilting and/or rotations of WO4/MoO4 tetrahedral units that lead to a disorder in the oxygen sublattice. Raman spectroscopy data also indicated that K2WO4 and MgMoO4 exhibited a first-order phase transition at around 723 K and 770 K, respectively, changing from monoclinic to hexagonal symmetry. (c) 2012 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {RADARWEG 29, 1043 NX AMSTERDAM, NETHERLANDS}, author = {Luz-Lima, C and Batista, J C and Freire, P T C and de Sousa, G P and dos Santos, F E P and Filho, J Mendes and Viana, B C and Saraiva, G D}, biburl = {https://www.bibsonomy.org/bibtex/2ff6b6826ce289ecef126e00d64a95112/ppgfis_ufc_br}, doi = {10.1016/j.vibspec.2012.11.016}, interhash = {3d8ab2ad904226a12ef3d21a2be3ec80}, intrahash = {ff6b6826ce289ecef126e00d64a95112}, issn = {0924-2031}, journal = {VIBRATIONAL SPECTROSCOPY}, keywords = {High Magnesium Phase Raman molybdate; spectroscopy; temperature; transformation} tungstate; {Dipotassium}, pages = {58-65}, publisher = {ELSEVIER}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Temperature-dependent Raman spectroscopy studies of phase transformations in the K2WO4 and the MgMoO4 crystals}, tppubtype = {article}, volume = 65, year = 2013 }