Affiliation:
1. University of California at Santa Barbara, Department of Chemistry, USA
Abstract
Temperature-dependent EPR data of potassium-electro-sodalite (PES),
K8[Al6Si6O24](e-)2, are consistent with the occurrence of an
antiferromagnetic phase transition at 71?2 K. PES is a Mott insulator which
contains an unpaired electron in every sodalite cage. The same transition in
sodium-electro-sodalite occurs at a considerably lower temperature (42 K),
indicating that the exchange interaction among localized electrons is
stronger in PES. PES is obtained by the inclusion of one potassium atom in
every cage of potassium sodalite. The 27 Al MAS NMR resonance of PES is
shifted downfield in respect to diamagnetic potassium-sodalite,
K6[Al6Si6O24]. The NMR shift is due to unpaired electrons and is caused by
hyperfine Fermi contact interaction.
Publisher
National Library of Serbia
Cited by
22 articles.
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