Scientific Commons: S. A. T. Redfern

Effect of Chemical Pressure on the Magnetic Transition of Multiferroic Ca-BiFeO3 (2009)

Catalan, G., Sardar, K., Church, N. S., Scott, J. F., Harrison, R. J., Redfern, S. A. T.

Multiferroic BiFeO3 ceramics have been doped with Ca. The smaller ionic size of Ca compared with Bi means that doping acts as a proxy for hydrostatic pressure, at a rate of 1%Ca=0.3GPa. It is also...

Structural Origin of the Metal-Insulator Transition of Multiferroic BiFeO3 (2009)

Redfern, S. A. T., Walsh, J. N., Clark, S. M., Catalan, G., Scott, J. F.

We report X-ray structural studies of the metal-insulator phase transition in bismuth ferrite, BiFeO3, both as a function of temperature and of pressure (931 oC at atmospheric pressure and ca. 45 GPa...

Magnetoelastic-magnetoelectric phase transitions in multiferroic BiFeO3 (2008)

Redfern, S. A. T., Wang, C., Hong, J. W., Catalan, G., Scott, J. F.

Our measured dielectric constant and mechanical response of multiferroic BiFeO3 indicate four phase transitions below room temperature. Features correlate with those reported at 50K (from a peak in...

The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition (2007)

Palai, R., Katiyar, R. S., Schmid, H., Tissot, P., Clark, S. J., Robertson, J., ...

We show that epitaxial (001) thin films of multiferroic bismuth ferrite BiFeO3 are monoclinic at room temperature instead of tetragonal or Rhombohedral as reported earlier . We report a orthorhombic...

Neutron total scattering and reverse Monte Carlo study of cation ordering in CaxSr1-xTiO3 (2007)

Hui, Q, Dove, M T, Tucker, M G, Redfern, S A T, Keen, D A

Ferroelectric nanoscale domains and the 905K phase transition in SrSnO3: A neutron total scattering study (2007)

Goodwin, A L, Redfern, S A T, Dove, M T, Keen, D A, Tucker, M G

Pressure dependence of Fe-Ti order in the ilmenite-hematite solid solution: implications for the origin of lower crustal magnetization (2005)

Harrison, R J, Stone, H J, Redfern, S A T

Solid solubilities of (La Nd,)2(Zr,Ti)2O7 phases deduced by neutron diffraction (2005)

Harvey, E J, Whittle, K R, Lumpkin, G R, Smith, R I, Redfern, S A T

Phase transitions in BaTiO3: a high-pressure neutron diffraction study (2005)

Hayward, S A, Redfern, S A T, Stone, H J, Tucker, M G, Whittle, K R, Marshall, W G

The sequence of ferroelectric phase transitions (Pm3m P4mm Amm2) in BaTiO3 has been studied as a function of temperature (298 K 130 K) at a fixed pressure (3.2 GPa). The same sequence of...

Remote determination of sample temperature by neutron resonance spectroscopy (2005)

Stone, H J, Cope, E R, Tucker, M G, Le Godec, Y, Méducin, F M, Hayward, S A, ...

Low-temperature behaviour of ammonium ion in buddingtonite [N(D/H) 4 AlSi 3 O 8 ] from neutron powder diffraction (2004)

Mookherjee, M., Swainson, I., Redfern, S. A. T., Harlov, D. E.

The structural response of buddingtonite [N(D/H) 4 AlSi 3 O 8 ] on cooling has been studied by neutron diffraction. Data have been collected from 280 K down to 11 K, and the crystal structure refined...

Study of cation order-disorder in MgAl2O4 spinel by in situ neutron diffraction up to 1600 K and 3.2 GPa (2004)

Méducin, F, Redfern, S A T, Le Godec, Y, Stone, H J, Tucker, M G, Dove, M T, ...

Structural studies of hollandite-based radioactive waste forms (2004)

Whittle, K R, Ashbrook, SE, Redfern, S A T, Lumpkin, G R, Attfield, J P, Dove, M, ...

Materials Research Society Symposium Proceedings 807: 339344 (2004)

Mineral Sciences, Earth Sciences, Environment and Cultural Heritage (2003)

Rinaldi, R, Winkler, B, Redfern, S A T

Recent developments using the Paris-Edinburgh cell for neutron diffraction at high pressure and high temperature and some applications (2003)

Le Godec, Y, Dove, M T, Redfern, S A T, Tucker, M G, Marshall, W G, Syfosse, G, ...

Neutron powder diffraction of minerals at high pressures and temperatures: some recent technical developments and scientific applications (2002)

Redfern, S A T

Temperature dependent Fe2+-Mn2+ order-disorder in amphiboles (2002)