Local degrees of freedom and nuclear quadrupolar spin relaxation in liquid metals and alloys

Elwenspoek, Michael Curt; Brinkmann, R.; Hartrott, M. v.; Kiehl, M.; Maxim, Peter E.; Paulick, C. A.; Quitmann, D.

doi:10.1007/bf02147319

Cited by 4 publications

(3 citation statements)

References 11 publications

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“…It might be possible to explain this behavior for the bimetallic catalyst in terms of an In−Pt melt (not observed in a previous experiment by EXAFS 10 ). In this case, the EFG produced by them could differ enough so that the cancellation of the two- and three-particle correlation functions is no longer perfect and the ions have to move longer distances to destroy the memory of the EFG at the probe and a relaxation process would occur. , However, this explanation would not be possible for the monometallic catalyst. The presence of liquid metallic indium in this catalyst, given the characteristics indicated above, could not bring about the observed relaxation.…”

Section: Discussionmentioning

confidence: 99%

“…For the case of In 2 O 3 , practically no attenuation is observed above 350 °C . Liquid phases can also lead to the appearance of relaxation processes . In liquid metals and alloys, time-dependent relaxation is due to fluctuating electrical field gradients.…”

Section: Methodsmentioning

confidence: 99%

“…19 Liquid phases can also lead to the appearance of relaxation processes. 21 In liquid metals and alloys, timedependent relaxation is due to fluctuating electrical field gradients. It is well established that the main contribution to these fluctuations comes from the thermal motion of the ions surrounding a probe atom.…”

Section: Introductionmentioning

confidence: 99%

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In Situ PAC Study of InPt Exchanged Zeolites under Different Redox Conditions

et al. 2002

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The effect of reduction treatments in H 2 at 500 °C in both wet and dry atmosphere on mono and bimetallic In-zeolite supported catalysts has been studied using the perturbed angular correlation technique. The relaxation in the observed hyperfine interaction has been associated with the formation of oxygen vacancies in the indium sesquioxide particles present on the external surface of the catalysts. The addition of Pt has consequences for the relaxation process. The effect of Pt atoms could be associated with the trapping of vacancies, thus slowing down their jump frequency. This particular and indirect In-Pt interaction does not seem to have any effect on the enhancement of the catalytic activity observed in the bimetallic sample. A new indium species with cubic symmetry for the In site, i.e., metallic indium and/or In 2 O 3 nanosized crystallites, was detected in reduced In/ferrierite and InPt/ferrierite samples.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%