A Raman scattering study of the phase transition in the (NH4)3WO3F3 oxyfluoride

Krylov, A.; Gerasimova, Yu.; Vtyurin, A.; Fokina, V.; Laptash, N.; Voit, E.
July 2006
Physics of the Solid State;Jul2006, Vol. 48 Issue 7, p1356
Academic Journal
The Raman scattering spectra of polycrystalline samples of the (NH4)3WO3F3 perovskite-like oxyfluoride were measured at frequencies of 70�3600 cm-1 in the temperature range 93�323 K, including the transition from the orientationally disordered cubic phase to the low-symmetry phase. Transitional anomalies in the spectral parameters were revealed in the frequency ranges of internal vibrations of the ammonium ions and WO3F3 octahedral groups. An analysis of the experimental results allowed the conclusion that the phase transition under study is associated primarily with the ordering of the octahedral groups.


Related Articles

  • Raman spectroscopic study of the phase transitions in the (NH4)3WO3F3 oxyfluoride. Vtyurin, A.; Krylov, A.; Gerasimova, Yu.; Fokina, V.; Laptash, N.; Voit, E. // Physics of the Solid State;Jun2006, Vol. 48 Issue 6, p1067 

    The Raman spectra of (NH4)3WO3F3 perovskite-like oxyfluorides are measured in the frequency range 70�3600 cm-1. The anomalies observed in the spectral parameters upon phase transitions at a temperature of 200 K under atmospheric pressure and at room temperature under a pressure of 1.4 GPa...

  • Inelastic neutron scattering study of the specific features of the phase transitions in (NH4)2WO2F4. Smirnov, L. S.; Kolesnikov, A. I.; Flerov, I. N.; Laptash, N. M. // Physics of the Solid State;Nov2009, Vol. 51 Issue 11, p2362 

    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 T1 = 201 K and T2 = 160 K...

  • Probing the ferroelectric phase transition through Raman spectroscopy in Pb(Fe2/3W1/3)1/2Ti1/2O3 thin films. Kumar, Ashok; Murari, N. M.; Katiyar, R. S.; Scott, James F. // Applied Physics Letters;6/25/2007, Vol. 90 Issue 26, p262907 

    The present work investigates the evolution of micro-Raman spectra of (1-x)Pb(Fe2/3W1/3)O3-xPbTiO3 (PFWT) (x=0.50) thin films in the temperature range from 80 to 600 K. Raman and dielectric data indicate that the crystal structure changes from tetragonal to cubic, i.e., a ferroelectric phase...

  • Deuteration-induced phase transition in ammonium hexachloroplumbate. Kume, Y.; Muraoka, H. // Journal of Chemical Physics;3/8/1998, Vol. 108 Issue 10, p4090 

    Explores the deuteration-induced phase transition in ammonium hexachloroplumbate. Gradual phase transition of ammonium compounds; Shift of transition temperature in ammonium compounds; Calculation of the standard thermodynamic functions from the heat capacity.

  • Characterization of four phase transitions in Pb5Al3F19, including a new transition at 670 K, by.... Omari, Mohammed El; Reau, Jean-Maurice // Journal of Chemical Physics;2/15/1998, Vol. 108 Issue 7, p2896 

    Characterizes four phase transitions in lead aluminum fluoride PB5Al3F19 by impedance and nuclear magnetic resonance spectroscopy. Inclusion of ferroelectric phase V in four phase transitions; Similarity in transition temperature between phase V and F- ions; Importance of alternating...

  • Phase transitions and chemical transformations of nitromethane up to 350 �C and 35 GPa. Courtecuisse, St�phane; Cansell, Fran�ois; Fabre, Denise; Petitet, Jean-Pierre // Journal of Chemical Physics;1/8/95, Vol. 102 Issue 2, p968 

    Nitromethane has been studied as a model of the energetic nitro compounds. The phase diagram has been determined by Raman scattering in the pressure and temperature ranges of 0�35 GPa and 20�350 �C, respectively. Three new solid phases of nitromethane called III, IV, V, and their...

  • Magnetic sublevel specific stimulated Raman pumping of molecular H[sub 2]. Cureton-Chinn, Sarah; Kelly, Peter B.; Augustine, Matthew P. // Journal of Chemical Physics;3/22/2002, Vol. 116 Issue 12, p4837 

    The magnetic sublevel specific preparation of the X� [sup +][sub g], v = 1, J =1 state of molecular H[sub 2] using stimulated Raman pumping with circularly polarized light to saturate the Q[sub 01](1) transition is reported. The intensities of S branch rotational Raman scattering signals...

  • The Cubic-to-Monoclinic Phase Transition in (NH[sub 4])[sub 3]ScF[sub 6] Cryolite: A Raman Scattering Study. Vtyurin, A. N.; Bulou, A.; Krylov, A. S.; Afanas�ev, M. L.; Shebanin, A. P. // Physics of the Solid State;Dec2001, Vol. 43 Issue 12, p2307 

    This paper reports on a Raman study of the cubic-to-monoclinic phase transition in (NH[sub 4])[sub 3]ScF[sub 6] cryolite. We observed sharp anomalies in the frequencies and half-widths of the Raman lines corresponding to internal vibrations of the ScF[sup 3+][sub 6] ions and to lattice...

  • Critical chain dynamics near the interdigitated�noninterdigitated chain configurational phase transition in decylammonium chloride. Lee, Kyu Won; Oh, D. K.; Lee, Cheol Eui; Kang, J. K.; Lee, Chang Hoon; Kim, Joon // Journal of Chemical Physics;11/1/2002, Vol. 117 Issue 17, p8004 

    We have carried out a �H nuclear magnetic resonance line shape analysis near the irreversible interdigitated-to-noninterdigitated chain configurational phase transition in decylammonium chloride (C[sub 10]H[sub 21]NH[sub 3]Cl), a model biomembrane. The splitting parameter corresponding to...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics