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

Autores
Martínez, Jorge Alberto; Rivas, Patricia Claudia; Caracoche, María Cristina; Rodríguez, A. M.; López García, Alberto Raúl; Spinelli, Sacha
Año de publicación
1986
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
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.
Facultad de Ciencias Exactas
Materia
Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/131102
Acceder
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network_name_str SEDICI (UNLP)
spelling The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6Martínez, Jorge AlbertoRivas, Patricia ClaudiaCaracoche, María CristinaRodríguez, A. M.López García, Alberto RaúlSpinelli, SachaCiencias ExactasFísicaThermal behaviourammonium hafnium hexafluorideA 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.Facultad de Ciencias Exactas1986info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf9-16http://sedici.unlp.edu.ar/handle/10915/131102enginfo:eu-repo/semantics/altIdentifier/issn/0304-3843info:eu-repo/semantics/altIdentifier/issn/1572-9540info:eu-repo/semantics/altIdentifier/doi/10.1007/bf02400096info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-15T11:23:33Zoai:sedici.unlp.edu.ar:10915/131102Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-15 11:23:34.103SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
title The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
spellingShingle The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
Martínez, Jorge Alberto
Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
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 The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
dc.creator.none.fl_str_mv Martínez, Jorge Alberto
Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
author Martínez, Jorge Alberto
author_facet Martínez, Jorge Alberto
Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
author_role author
author2 Rivas, Patricia Claudia
Caracoche, María Cristina
Rodríguez, A. M.
López García, Alberto Raúl
Spinelli, Sacha
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
topic Ciencias Exactas
Física
Thermal behaviour
ammonium hafnium hexafluoride
dc.description.none.fl_txt_mv 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.
Facultad de Ciencias Exactas
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.
publishDate 1986
dc.date.none.fl_str_mv 1986
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/131102
url http://sedici.unlp.edu.ar/handle/10915/131102
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0304-3843
info:eu-repo/semantics/altIdentifier/issn/1572-9540
info:eu-repo/semantics/altIdentifier/doi/10.1007/bf02400096
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
9-16
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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score 13.22299

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