The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6

A TDPAC investigation has been accomplished on (NH4)2 HfF6 between 14 and 620 K. A phase transition was observed below 390 K. The low temperature phase is characterized by two non-equivalent sites for hafnium atoms in a 1∶1 ratio. The high temperature phase, on the other hand, is depicted by a uniqu...

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Autores principales: Martínez, Jorge Alberto, Rivas, Patricia Claudia, Caracoche, María Cristina, Rodríguez, A. M., López García, Alberto Raúl, Spinelli, Sacha
Formato: Articulo
Lenguaje:Inglés
Publicado: 1986
Materias:
Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/131102
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-131102
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
spellingShingle Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
Martínez, Jorge Alberto
Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
topic_facet Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
description A TDPAC investigation has been accomplished on (NH4)2 HfF6 between 14 and 620 K. A phase transition was observed below 390 K. The low temperature phase is characterized by two non-equivalent sites for hafnium atoms in a 1∶1 ratio. The high temperature phase, on the other hand, is depicted by a unique quadrupole interaction. Above 400 K, the compound decomposes successively to NH4 HfF5, NH4 Hf2F9 and HfF4. An enthalpy of 76±4 kJ/mol could be determined for the (NH4)2 HfF6→NH4 HfF5+NH4F chemical reaction. The hyperfine interaction and thermal evolution of (NH4)2 HfF6 was found to be quite similar to that of (NH4)2 ZrF6.
format Articulo
Articulo
author Martínez, Jorge Alberto
Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
author_facet Martínez, Jorge Alberto
Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
author_sort Martínez, Jorge Alberto
title The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title_short The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title_full The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title_fullStr The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title_full_unstemmed The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title_sort thermal behaviour of the quadrupole hyperfine interaction in (nh4)2hff6
publishDate 1986
url http://sedici.unlp.edu.ar/handle/10915/131102
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