EXAFS and XANES Studies of Wolffram's Red Salt

Terauchi, Hikaru; Iida, Satoshi; Tanabe, Kazuhiro; Kikukawa, Kenji; Hida, Moritaka; Kamijo, Nagao

doi:10.1143/jpsj.52.3700

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…In this picture, dipoles may be frustrated by the applied field, and a process of multiple hopping among the potential dips will give rise to a deviation from the Arrhenius plot (we just guess that this leads to applicability of the Vogel-Fulcher relationship). Similar phenomena were found for dipole-glass systems [18][19][20] where FE and AF phases are mixed explicitly, e.g., RbH 2 PO 4 -NH 4 H 2 PO 4 and PbTiO 3 -PbZrO 3 systems. However, because of the inhomogeneous distribution of each component in these mixtures, the frustration is expected as a matter of course.…”

Section: Resultssupporting

confidence: 76%

“…Unlike the case for PMN [5], the dielectric behaviours appear through frustration between the FE and AF dipole orders. This is the same mechanism as is operative in the FE-AF mixed-crystal systems [18][19][20]. But disordered PSN is not a mixture of any FE and AF phases, as is seen from the chemical formula, and the pre-existence of the AF regions in the paraelectric state is caused by self-accommodation of the size-effect lattice distortions, which is an effect unique to this system.…”

Section: Discussionmentioning

confidence: 70%

See 1 more Smart Citation

Effects of B-site ordering/disordering in lead scandium niobate

Takesue

Fujii

Ichihara

et al. 1999

J. Phys.: Condens. Matter

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Effects of disordering of Sc3+ and Nb5+ in the relaxor ferroelectrics Pb(Sc1/2Nb1/2)O3 (PSN) were investigated by means of measurements of x-ray scattering and dielectricity. Results on the diffuse scattering from ordered PSN indicate lattice instabilities at the and M points near 353 K, and these were expected to cause the formation of ferroelectric (FE) and antiferroelectric (AF) phases. The freezing behaviours are slightly diffuse because of the partitioning of the thermal energy to the two modes, but yet of the type characteristic of normal soft-phonon modes. The results of the dielectric constant measurement under an alternating-current field indicated a highly polydispersive dispersion and a significant temperature dependence of the relaxation frequency. These unusual results imply a competing interaction between the two lattice instabilities. The x-ray work on disordered PSN shows `diffuse' transition behaviours at the two points. It is suggested that this feature originates from lattice relaxation through the softening of the two modes. The distortions are self-accommodated in atomic displacements at the M point, and analysis of the intensities suggests that the displacement pattern has the form of an AF distortion. During the FE freezing, the coexisting FE and AF regions may give rise to a dipole-glass state, and this is thought to cause relaxor behaviours through frustration between the two states.

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Section: Resultssupporting

confidence: 76%