Nuclear spin relaxation in electrolyte glasses

Kanert, O.; Hackmann, Andreas; Küchler, R.; Ngai, K. L.

doi:10.1016/0022-3093(94)90672-6

Cited by 5 publications

(7 citation statements)

References 8 publications

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“…The x-ray pattern of the treated sample at 653 K contains some peaks that are not present in the sample treated at 673 K. This is consistent with the hypothesis expressed above, which suggests that some solid phase transformation could occur at high temperature. This behavior is similar to that of fluorozirconate glasses, in which BaF 2 and BaZrF 6 have also been identified by XRD, for heat treated samples, 14 with a ␤-␣ solid state transition.…”

Section: B X-ray Diffractionsupporting

confidence: 79%

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Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

Franco

Tambelli

Magon

et al. 1998

The Journal of Chemical Physics

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Results of differential scanning calometry ͑DSC͒, x-ray diffraction ͑XRD͒, and 19 F nuclear magnetic resonance ͑NMR͒ of InF 3 -based glasses, treated at different temperatures, ranging from glass transition temperature (T g ) to crystallization temperature (T c ), are reported. The main features of the experimental results are as follows. DSC analysis emphasizes several steps in the crystallization process. Heat treatment at temperatures above T g enhances the nucleation of the first growing phases but has little influence on the following ones. XRD results show that several crystalline phases are formed, with solid state transitions when heated above 680 K. The 19 F NMR results show that the spin-lattice relaxation, for the glass samples heat treated above 638 K, is described by two time constants. For samples treated below this temperature a single time constant T 1 was observed. Measurements of the 19 F spin-lattice relaxation time (T 1 ), as a function of temperature, made possible the identification of the mobile fluoride ions. The activation energy, for the ionic motion, in samples treated at crystallization temperature was found to be 0.18Ϯ0.01 eV.

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Section: B X-ray Diffractionsupporting

confidence: 79%

“…14,24,25 Progress in NMR characterization of ionic transport and relaxation in glasses was recently reviewed by Kanert and co-workers. 15 In general, little attention has been paid to NMR studies concerning the crystallization process occurring above the glass transition temperature.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

Franco

Tambelli

Magon

et al. 1998

The Journal of Chemical Physics

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“…Figure 23 ArrheniusploPo4 of exchange time between radical conformers in photopolymerized triacrylate without(0) and in the presence (H) of l per cent of photoinitiator…”

mentioning

confidence: 99%

“…Figure 24 Arrhenius plot3" of rate parameters for pyrene ion growth and dimethyl-diphenyl ion decay in pulse irradiated polyethylene jilm: Py' (O), Py-(a), DMD(0) …”

mentioning

confidence: 99%

Chapter 5. Dispersive kinetics

Płonka¹

1994

Annu. Rep. Prog. Chem., Sect. C

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“…Pode-se observar neste sistema que a curva de relaxação do 19F muda abruptamente próximo a Tg , mostrando uma taxa máxima para temperaturas bem acima de Tg . Este comportamento tem sido também observado em outros vidros fluorados [97,119,120] , bem como em eletrólitos vítreos aquosos [105].…”

Section: Introdução: Vidros Fluoradosunclassified

Estudo de condutores iônicos vítreos e poliméricos por ressonância magnética nuclear

Júnior¹,

Luiz²

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Embora seja dificil expressar a minha gratidão, a todas as pessoas que direta ou indiretamente, contribuíram para a realização deste trabalho, deixo aqui meus sinceros agradecimentos: Ao meu orientador, Prof. Or. José Pedro Donoso G., pessoa ímpar, figura humana excepcional, pela orientação dispensada, pelo incentivo, pelo auxílio na solução dos problemas encontrados, enfim pelo apoio na conclusão deste trabalho, tenho-lhe a mais alta estima. Ao Prof. Dr. Claudio J. Magon, pelo apoio incondicional na solução dos problemas experimentais ou teóricos, pela amizade durante estes anos de trabalho, pelo incentivo e sua enorme colaboração. Ao Prof. Or. TeImo S. Auler, pela arni7ade, pelas discussões valiosas, pelo seu apoio na solução dos problemas, sou-lhe muito grato. Ao Prof. Or. Tito J. Bonagamba e ao Nilson C. Mello pelas medidas de relaxação do Lítio no Laboratório de Espectroscopia de Alta Resolução. Ao Prof. Or Younes Messadeq e a Prof. Dra. Angela Delben pelas discussões sobre as amostras vítreas. Ao Ruberlei R. Souza, pelo grande auxilio e pela amizade. Ao Alexandre Ferraz, pela sua presteza em ajudar, pela preparação das amostras de vidros fluorados e pela amizade. Aos engenheiros do grupo Edson L. Géa Vidoto, Mateus J. Martins, pela grande colaboração na resolução de problemas experimentais. Aos meus colegas de trabalho no grupo de RMN, João G. da Silva, 1. Carlos Gazziro, 000 A. Canevarollo, Roberto W. A. Franco, pela grande colaboração e pela amizade. Ao Ricardo Santana, pela grande amizade e coleguismo. Ao meu colega e grande amigo Marco Aurélio Pagnano, pela discussões e pela sincera amizade. Ao Ronan Lebullenger pelas medidas de DSC nas amostras vítreas. Ao Samuel , pelos desenhos dos "probes". Aos meus pais que sempre compreenderam e apoiaram-me para que eu pudesse concluir esta Tese. À Silvia, pessoa sensível, de qualidades excepcionais, pelo carinho. Ao Daniel, meu filho, pela alegria de poder estar ao seu lado. Ao CNPq, CAPES, FAPESP, USP, pelo auxílio financeiro.

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Nuclear spin relaxation in electrolyte glasses

Cited by 5 publications

References 8 publications

Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

Differential scanning calorimetry, x-ray diffraction and F19 nuclear magnetic resonance investigations of the crystallization of InF3-based glasses

Chapter 5. Dispersive kinetics

Estudo de condutores iônicos vítreos e poliméricos por ressonância magnética nuclear

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