X-ray and neutron scattering

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Structural description of the superionic behaviour in the system (AgI)x–(PbI2)1−x, 2/3≤x≤4/5

Solid State Ionics Elsevier 147:1-2 (2002) 97-106

Authors:

S Hull, DA Keen, P Berastegui
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Comments on quasicrystalline phases and examples of quasicrystalline phase nomenclature in "Nomenclature of magnetic, incommensurate, composition-changed morphotropic, polytype, transient-structural and quasicrystalline phases undergoing phase transitions. II. Report of an IUCr Working Group on Phase Transition Nomenclature" by J.-C. Tolédano et al. (2001). Acta Cryst. A57, 614-626.

Acta crystallographica. Section A, Foundations of crystallography 58:Pt 2 (2002) 209
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The high-temperature superionic behaviour of Ag2S

Journal of Physics Condensed Matter IOP Publishing 14:1 (2002) l9

Authors:

S Hull, DA Keen, DS Sivia, PA Madden, M Wilson
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A new view of conoscopic illumination of optically active crystals

JOURNAL OF APPLIED CRYSTALLOGRAPHY 35 (2002) 185-190

Authors:

MA Geday, AM Glazer
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Investigation of a peculiar relaxor ferroelectric: Na0.5Bi0.5TiO3.

FERROELECTRICS 270 (2002) 1377-1382

Authors:

GO Jones, J Kreisel, V Jennings, MA Geday, PA Thomas, AM Glazer

Abstract:

The relaxor ferroelectric, Sodium Bismuth Titanate, (Na0.5Bi0.5TiO3), NBT is an A-site substituted distorted perovskite. An extensive temperature-, pressure- and substitution-dependent study of the crystal structure and phase transitions in this compound has been carried out using neutron/x-ray diffraction techniques. This has been complemented with optical, Raman and computational modelling studies.The temperature-dependent investigation shows that NBT undergoes a first phase transition from the high-temperature cubic prototype (Pm (3) over bar m) Phase I to Phase II of tetragonal symmetry (P4bm) and then a second one with strong diffuse character to Phase III of rhombohedral symmetry (R3c). The high-pressure study of NBT has revealed an interesting and unusual relaxor-to-antiferroelectric (R3c --> Pnma) phase transition. Structural variations as a function of temperature and doping across the (Na1-xKx)(0.5)Bi0.5TiO3 (NKBT) series have also been established.
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