Examinando por Autor "Lanza de Dussel, H."

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    A new ferroelectric: Guanidinium uranyl sulfate trihydrate.
    (Taylor & Francis, 1978) Lanza de Dussel, H.; Wainer, L. S. de; Rodríguez de Benyacar, M. A.
    Dielectric behaviour studies have been carried out on (C(NH2) 3) 2) - UO2 - (SO4)2 - 3H2O, a member of the family of guanidinium sulfate hydrates. The uranyl compound, which is not isomorphous with G.A.S.H., is ferroelectric from about 100°C (decomposition temperature) down to -30 °C , the lowest we have employed. Domain structure and etch-pit configuration are quite similar to those observed in G.A.S.H.
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    ÍtemAcceso Abierto
    Symmetry and phase transitions in (AsO4) 2H2 (U02) 2. 8 H20.
    (Taylor & Francis, 1978) Rodríguez de Benyacar, M. A.; Lanza de Dussel, H.
    Some reasonabíe guesses on the point group symmetry of the paraelectric, antiferroelectric and ferroelectric phases of synthetic hydrogen uranospinite have been made, taking as starting points the previously known facts and macroscopic symmetry considerations. The most probable point group for the paraelectric phase is 4/m m m , for the anti ferroelectric phase II most probable point groups are 1, 1, 2 and 222, for the ferroelectric phase III is I and for the forced ferroelectric phase IV, 4m mm , Some mechanisms are proposed to explain the structural features observed.