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Date(s)
- s.d (Production)
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Étendue matérielle et support
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".
Appraisal, destruction and scheduling
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Language of material
- anglais
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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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Rules and/or conventions used
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.
Statut
Niveau de détail
Dates of creation revision deletion
2007/05/01