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Featured researches published by Hien-Yoong Hah.


Inorganic Chemistry | 2017

Oxygen Insertion Reactions within the One-Dimensional Channels of Phases Related to FeSb2O4

Benjamin P. de Laune; Gregory J. Rees; Mariana J. Whitaker; Hien-Yoong Hah; Charles E. Johnson; Jacqueline A. Johnson; Dennis E. Brown; Matthew G. Tucker; Thomas C. Hansen; Frank J. Berry; John V. Hanna; C. Greaves

The structure of the mineral schafarzikite, FeSb2O4, has one-dimensional channels with walls comprising Sb3+ cations; the channels are separated by edge-linked FeO6 octahedra that form infinite chains parallel to the channels. Although this structure provides interest with respect to the magnetic and electrical properties associated with the chains and the possibility of chemistry that could occur within the channels, materials in this structural class have received very little attention. Here we show, for the first time, that heating selected phases in oxygen-rich atmospheres can result in relatively large oxygen uptakes (up to ∼2% by mass) at low temperatures (ca. 350 °C) while retaining the parent structure. Using a variety of structural and spectroscopic techniques, it is shown that oxygen is inserted into the channels to provide a structure with the potential to show high one-dimensional oxide ion conductivity. This is the first report of oxygen-excess phases derived from this structure. The oxygen insertion is accompanied not only by oxidation of Fe2+ to Fe3+ within the octahedral chains but also Sb3+ to Sb5+ in the channel walls. The formation of a defect cluster comprising one 5-coordinate Sb5+ ion (which is very rare in an oxide environment), two interstitial O2- ions, and two 4-coordinate Sb3+ ions is suggested and is consistent with all experimental observations. To the best of our knowledge, this is the first example of an oxidation process where the local energetics of the product dictate that simultaneous oxidation of two different cations must occur. This reaction, together with a wide range of cation substitutions that are possible on the transition metal sites, presents opportunities to explore the schafarzikite structure more extensively for a range of catalytic and electrocatalytic applications.


Journal of Power Sources | 2014

The reaction mechanism of SnSb and Sb thin film anodes for Na-ion batteries studied by X-ray diffraction, 119Sn and 121Sb Mössbauer spectroscopies

Loïc Baggetto; Hien-Yoong Hah; Jean-Claude Jumas; Charles E. Johnson; Jacqueline A. Johnson; Jong K. Keum; Craig A. Bridges; Gabriel M. Veith


Physical Chemistry Chemical Physics | 2014

The reaction mechanism of FeSb2 as anode for sodium-ion batteries

Loïc Baggetto; Hien-Yoong Hah; Charles E. Johnson; Craig A. Bridges; Jacqueline A. Johnson; Gabriel M. Veith


Physical Chemistry Chemical Physics | 2014

The reaction mechanism of FeSb(2) as anode for sodium-ion batteries.

Loïc Baggetto; Hien-Yoong Hah; Charles E. Johnson; Craig A. Bridges; Jacqueline A. Johnson; Gabriel M. Veith


Chemical Geology | 2017

Iron K-edge X-ray absorption near-edge structure spectroscopy of aerodynamically levitated silicate melts and glasses

O. L. G. Alderman; Martin Wilding; Antony Tamalonis; S. Sendelbach; Steve M. Heald; C. J. Benmore; Charles E. Johnson; Jacqueline A. Johnson; Hien-Yoong Hah; J. K. R. Weber


Hyperfine Interactions | 2016

Mössbauer studies of stoichiometry of Fe3O4: characterization of nanoparticles for biomedical applications

Charles E. Johnson; Jacqueline A. Johnson; Hien-Yoong Hah; M. Cole; Sharon K. Gray; V. Kolesnichenko; P. Kucheryavy; Galina Goloverda


Geochimica et Cosmochimica Acta | 2017

Local structural variation with oxygen fugacity in Fe2SiO4+x fayalitic iron silicate melts

O. L. G. Alderman; Lena Lazareva; Martin Wilding; C. J. Benmore; Steve M. Heald; Charles E. Johnson; Jacqueline A. Johnson; Hien-Yoong Hah; S. Sendelbach; A. Tamalonis; L. B. Skinner; John B. Parise; J. K. R. Weber


Journal of Magnetism and Magnetic Materials | 2018

Magnetism and Mössbauer study of formation of multi-core γ-Fe2O3 nanoparticles

Saeed Kamali; Eugenio Bringas; Hien-Yoong Hah; Brian Bates; Jacqueline A. Johnson; Charles E. Johnson; Pieter Stroeve


Chemical Communications | 2016

The magnetic and crystal structures of Sr1−δFeO2−xFx, a new oxyfluoride

Bing Li; John Woods; Joan Siewenie; Hien-Yoong Hah; Jacqueline A. Johnson; Charles E. Johnson; Despina Louca


Hyperfine Interactions | 2018

Magnetic interactions in Fe1−xMxSb2O4, M = Mg, Co, deduced from Mössbauer spectroscopy

Frank J. Berry; Benjamin P. de Laune; C. Greaves; Hien-Yoong Hah; Charles E. Johnson; Jacqueline A. Johnson; Saeed Kamali; José F. Marco; M F Thomas; Mariana J. Whitaker

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Charles E. Johnson

Northern Illinois University

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Jacqueline A. Johnson

University of Tennessee Space Institute

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Craig A. Bridges

Oak Ridge National Laboratory

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Gabriel M. Veith

Oak Ridge National Laboratory

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Loïc Baggetto

Oak Ridge National Laboratory

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Sharon K. Gray

University of Tennessee Space Institute

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C. J. Benmore

Argonne National Laboratory

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J. K. R. Weber

Argonne National Laboratory

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M. W. Cole

Pennsylvania State University

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O. L. G. Alderman

Argonne National Laboratory

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