Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related UIV Phosphates

Justin B. Felder; Stuart Calder; Hans Conrad Zur Loye

doi:10.1021/acs.inorgchem.8b01284

Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related U^IV Phosphates

Justin B. Felder, Stuart Calder, Hans Conrad Zur Loye

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Abstract

A new uranium fluoride phosphate, UFPO₄, was synthesized via a mild hydrothermal route and characterized optically, thermally, and magnetically. Two thermal transformation products, U₂O(PO₄)₂ and U^IVU^VIO₂(PO₄)₂, were discovered to be structurally related, and were subsequently synthesized for bulk property measurements. All three materials failed to follow Curie-Weiss behavior at low temperatures, attributed to the nearly ubiquitous singlet ground state of U(IV), transitioning into a Curie-Weiss paramagnetic regime at high temperatures. Neutron diffraction experiments were performed on UFPO₄ and U^IVU^VIO₂(PO₄)₂ in order to characterize this unusual magnetic behavior.

Original language	English
Pages (from-to)	9286-9295
Number of pages	10
Journal	Inorganic Chemistry
Volume	57
Issue number	15
DOIs	https://doi.org/10.1021/acs.inorgchem.8b01284
State	Published - Aug 6 2018

Funding

We gratefully acknowledge the United States Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering for funding this work through award DE-SC0008664 and DE-SC0018739. The work at ORNL was funding by the United States Department of Energy, Office of Basic Energy Sciences.

Funders	Funder number
Office of Basic Energy Sciences
United States Department of Energy
Division of Materials Sciences and Engineering	DE-SC0018739, DE-SC0008664

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title = "Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related UIV Phosphates",

abstract = "A new uranium fluoride phosphate, UFPO4, was synthesized via a mild hydrothermal route and characterized optically, thermally, and magnetically. Two thermal transformation products, U2O(PO4)2 and UIVUVIO2(PO4)2, were discovered to be structurally related, and were subsequently synthesized for bulk property measurements. All three materials failed to follow Curie-Weiss behavior at low temperatures, attributed to the nearly ubiquitous singlet ground state of U(IV), transitioning into a Curie-Weiss paramagnetic regime at high temperatures. Neutron diffraction experiments were performed on UFPO4 and UIVUVIO2(PO4)2 in order to characterize this unusual magnetic behavior.",

author = "Felder, {Justin B.} and Stuart Calder and {Zur Loye}, {Hans Conrad}",

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N2 - A new uranium fluoride phosphate, UFPO4, was synthesized via a mild hydrothermal route and characterized optically, thermally, and magnetically. Two thermal transformation products, U2O(PO4)2 and UIVUVIO2(PO4)2, were discovered to be structurally related, and were subsequently synthesized for bulk property measurements. All three materials failed to follow Curie-Weiss behavior at low temperatures, attributed to the nearly ubiquitous singlet ground state of U(IV), transitioning into a Curie-Weiss paramagnetic regime at high temperatures. Neutron diffraction experiments were performed on UFPO4 and UIVUVIO2(PO4)2 in order to characterize this unusual magnetic behavior.

AB - A new uranium fluoride phosphate, UFPO4, was synthesized via a mild hydrothermal route and characterized optically, thermally, and magnetically. Two thermal transformation products, U2O(PO4)2 and UIVUVIO2(PO4)2, were discovered to be structurally related, and were subsequently synthesized for bulk property measurements. All three materials failed to follow Curie-Weiss behavior at low temperatures, attributed to the nearly ubiquitous singlet ground state of U(IV), transitioning into a Curie-Weiss paramagnetic regime at high temperatures. Neutron diffraction experiments were performed on UFPO4 and UIVUVIO2(PO4)2 in order to characterize this unusual magnetic behavior.

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Retention of a Paramagnetic Ground State at Low Temperatures in a Family of Structurally Related U^IV Phosphates

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