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Inelastic neutron scattering study of the specific features of the phase transitions in (NH4)2WO2F4 |
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| Authors: | L S Smirnov A I Kolesnikov I N Flerov and N M Laptash |
| Institution: | 1.Alikhanov Institute for Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, 117218, Russia ;2.Spallation Neutron Source, Oak Ridge National Laboratory, 1 Bethel Valley Rd., Oak Ridge, TN, 37830-8050, USA ;3.Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russia ;4.Siberian Federal University, Svobodny pr. 79, Krasnoyarsk, 660041, Russia ;5.Institute of Chemistry, Far-Eastern Branch, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia ; |
| Abstract: | Oxyfluoride (NH4)2WO2F4 has been studied by the inelastic neutron scattering method over a wide temperature range 10–300 K at two initial neutron energies of 15 and 60 meV. The role of tetrahedral ammonium groups in the mechanism of sequential phase transitions at T 1 = 201 K and T 2 = 160 K has been discussed. |
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