Item 035 - 35. The ferroelectric phase transition in tri-glycine sulfate.

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BR SPSIARQ SP_Pi_ASC_035

Title

35. The ferroelectric phase transition in tri-glycine sulfate.

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  • s.d (Creation)

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06f.

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"The ferroelectric phase transition in Tri-Glycine Sulfate (TGS) at 49ºC has been studied by Raman spectroscopy of all the modes only the modes corresponding to the symmetry [A (y)], [y], beling the ferroelectric axis, show interesting temperature behavior. At low temperatures, we observed 9 modes and only 3 out of these 9 modes continue to be strong at room temperature, the lowest optic phonon undergoes a sharp increase in frenquecy with is in contradiction with the soft mode model of ferroelectric phase transitions. The dielectric constant of TGS has been analysed on the basis of a Mason-Debye type relaxation formula and a microscopic model is proposed which is consistent with the dielectric anomaly of the TGS at the transition temperature".

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  • English

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    Localização Física: SP Pi 35 - P3

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    Fundo: Instituto de Física " Gleb Wataghin" - IFGW

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    Descrição baseada em: CONSELHO INTERNACIONAL DE ARQUIVOS. ISAD (G): Norma geral internacional de descrição arquivística: segunda edição, adotada pelo Comitê de Normas de  Descrição,Estocolmo, Suécia, 19-22 de setembro de 1999, versão final pelo CIA - Rio de Janeiro: Arquivo Nacional, 2001.
    RIBEIRO, Antonia Motta de Castro Memória. AACR2: Anglo-American cataloguing rules, 2nd edition: descrição e pontos de acesso. Brasília: CDIT, 1995.

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    Full

    Dates of creation revision deletion

    2007/05/01

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