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Doctoral Thesis
DOI
10.11606/T.54.1983.tde-21052007-161450
Document
Author
Full name
Sergio Carlos Zilio
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 1983
Supervisor
Committee
Souza, Milton Ferreira de (President)
Mokross, Bernhard Joachim
Qualifik, Paul
Title in Portuguese
Espectroscopia entre 10 e 4000 centímetros pot. Aplicação aos modos vibracionais da sodalita natural brasileira
Keywords in Portuguese
Corrente termo-estimulada
Defeitos
Hologentos alcalinos
Relaxação dielétrica
Abstract in Portuguese
Encontrou-se que a relaxação dielétrica dos dipolos impureza-vacância em KI dopado com pequenas quantidades de KCl é extremamente diferente da relaxação dielétrica na matriz KI não contendo íons Cl-. Os novos picos de relaxação, atribuídos à presença do Cl- na vizinhança imediata do íon divalente, tem um tempo de relaxação 103 vezes menor que o normal na temperatura ambiente. Foi proposto um modelo para o aprisionamento dos íons divalentes pelo Cl- e estudado a influência dos raios atômicos do divalente e do anion estranho neste processo de aprisionamento.
Title in English
The influence of capture centers on the dielectric relaxation of KI:M++ crystals
Keywords in English
Alkalihalides
Defects
Dielectric relaxation
Thermo-stimulated current
Abstract in English
The dielectric relaxation due to I-V dipoles in KI doped with small amounts of KCl was found to be strongly different than in KI crystals not containing Cl-ions. The new relaxation peak attributed to the presence of the Cl- in the close neighborhood of the divalent ion has a relax¬ation time 103 greater than the normal one. A model for the trapping of the divalent ions by the Cl- is proposed. The influence of atomic radius of the divalent and the impurity anion is discussed.
 
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SergioZilio.pdf (4.72 Mbytes)
Publishing Date
2007-09-13
 
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