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Doctoral Thesis
DOI
10.11606/T.43.1982.tde-08112013-155356
Document
Author
Full name
Jose Carlos Sartorelli
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 1982
Supervisor
Committee
Sano, Walter (President)
Cattani, Mauro Sergio Dorsa
Qualifik, Paul
Rettori, Carlos
Watanabe, Shigueo
Title in Portuguese
Contribuição do exchange na largura de linha de ressonância paramagnetica eletrônica do ion N POT. 2+
Keywords in Portuguese
Ressonância paramagnética eletrônica
Abstract in Portuguese
Efetuamos medidas de RPE nos seguintes sais hexahidratados: fluorborato de níquel (Ni (BF IND. 4) IND. 2 6 H IND. 2 O) , perclorato de níquel (Ni(Cl O IND. 4) IND. 2 6 H IND. 2 O) e fluorsilicato de níquel (NiSi F IND. 6 6 H IND. 2 O). Os parâmetros da hamiltoniana de spin deste último sal foram redeterminados no intervalo de 100 K à 323 K. Os nossos resultados de RPE indicam a existência de anomalias no intervalo 153 K a 273 K que caracterizam uma transição de fase. Estudamos também as larguras de linha dos sais acima, separando as contribuições devido à interação spin- spin e a relaxação spin- rede. Os valores destas contribuições concordam perfeitamente com os calculados a partir de modelos teóricos. Desenvolvemos uma nova forma de linha que dá excelentes ajustes, por mínimos quadrados, das curvas experimentais.
Title in English
Contribution of exchange in line width of the electron paramagnetic resonance ion 'N2 + I'.
Keywords in English
Electron paramagnetic resonance
Abstract in English
We have performed EPR measurements in the following hexahidrated salts: nickel fluorborate (Ni(BF4)2 6H2O), nickel perchlorate (Ni(Cl04) 2 6H2O) and nickel fluorsilicate (NiSiF6 6 H20). The spin hamiltonian parameters of the last salt were determined once again in the range 100 - 323K. Our results of EPR indicate anomalies in the range 153 - 273K, which characterize a phase transition. Line widths of the above salts were also studied separating the contributions given by spin-spin interaction and spin-lattice relaxation. The values of these contributions agree with theoretical calculations. We have developped a new line form, which gives excellent fits, by least square fit, for the experimental data.
 
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RE47482Sartorelli.pdf (30.86 Mbytes)
Publishing Date
2014-02-21
 
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