X-ray and neutron scattering

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Automatic determination of the morphotropic phase boundary in lead magnesium niobate titanate Pb(Mg1/3Nb2/3)(1-x)TixO3 within a single crystal using birefringence imaging

JOURNAL OF APPLIED CRYSTALLOGRAPHY 37 (2004) 143-149

Authors:

D Zekria, AM Glazer
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Birefringence of lead titanate (PbTiO3)

JOURNAL OF APPLIED CRYSTALLOGRAPHY 37 (2004) 551-554

Authors:

D Zekria, AM Glazer, V Shuvaeva, J Dec, S Miga
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Diffuse first-order phase transition in NaNbO3:Gd

JOURNAL OF PHYSICS-CONDENSED MATTER 16:15 (2004) PII S0953-8984(04)77241-0

Authors:

IP Raevski, SI Raevskaya, SA Prosandeev, VA Shuvaeva, AM Glazer, MS Prosandeeva
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Effect of high pressure on the relaxor ferroelectrics Na1/2Bi1/2TiO3 (NBT) and PbMg(1/3)Nb(2/3)O3 (PMN)

FERROELECTRICS 302 (2004) 539-544

Authors:

J Kreisel, P Bouvier, B Dkhil, B Chaabane, AM Glazer, PA Thomas, TR Welberry

Abstract:

The aim of the present paper is to review and briefly discuss recent experimental results on the effect of high pressure (p > 1.5 GPa) on relaxor ferroelectrics, exemplified by Na1/2Bi1/2TiO3 and PbMg1/3Nb2/3O3. The main result is that relaxor ferroelectrics present important polar and structural pressure-instabilities, which lead to both phase transitions of the average structure and considerable changes of the local structure. It is in particular the observation of a pressure-induced suppression of the relaxor characteristic X-ray diffuse scattering that points to important changes in the local order. The complementary use of Raman spectroscopy, X-ray diffraction and X-ray diffuse scattering allows the proposition of a mechanism for the observed changes.
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Magnetic excitations in La1.5Sr0.5CoO4

Physica B Elsevier 350 (2004) e273-e275

Authors:

LM Helme, AT Boothroyd, D Prabhakaran, FR Wondre, CD Frost, J Kulda

Abstract:

We report magnetization and neutron scattering measurements of the half-doped compound La1.5Sr0.5CoO4, which exhibits a checkerboard pattern of charge ordering below not, vert, similar800 K. In the antiferromagnetically-ordered phase below not, vert, similar40 K the spins are found to be canted in the ab plane. The spin excitation spectrum includes spin-wave excitations with a maximum energy of 16 meV, and diffuse magnetic modes at energies around 30 meV.
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