TDPAC characterization of Ni2HfF8·12H2O and its decomposition products View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1990-06

AUTHORS

M. Ceolín, M. A. Taylor, P. C. Rivas, J. A. Martínez, M. C. Caracoche, H. Saitovitch

ABSTRACT

The hyperfine interaction in Ni2HfF8·12H2O has been determined between 77 K and 1100 K by means of the time-differential perturbed angular correlation technique. From 200 K on, the one-site phase existing at lower temperatures undergoes a gradual phase transition until, at room temperature, the populations of both phases attain a 2:1 ratio. While the quadrupole frequencies characterizing them exhibit aT3/2 thermal dependence, their population ratio seems to obey a Boltzmann distribution. At 350 K, when the η-value of the high temperature phase electric field gradient approaches its maximum value, the starting compound decomposes to NiHfF6·6H2O. A kinetics study of the Ni2HfF8·12H2O recovery at room temperature seems to indicate that a tri-dimensional diffusion mechanism is responsible for the corresponding reaction process. The first decomposition product of NiHfF6·6H2O left to atmospheric pressure is found to be NiHfF6·4H2O at 368 K and, between 414 K and 590 K, the high temperature cubic phase of NiHfF6 and Hf2OF6 can be simultaneously observed. Finally, monoclinic HfO2 appears from 1020 K on, having been preceded by an interaction which can be though of as depicting a preliminary stage in hafnia formation. More... »

PAGES

341-349

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02395657

DOI

http://dx.doi.org/10.1007/bf02395657

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1036117657


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