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Search Publications by: Terrence J Udovic (Assoc)

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Displaying 101 - 125 of 166

Exceptional Superionic Conductivity in Disordered Sodium Decahydro-closo-decaborate

October 13, 2014
Author(s)
Terrence J. Udovic, Motoaki Matsuo, Wan Si NMN Tang, Hui Wu, Vitalie Stavila, Alexei V. Soloninin, Roman V. Skoryunov, Olga A. Babanova, Alexander Skripov, John J. Rush, Atsushi Unemoto, Hitoshi Takamura, Shin-Ichi Orimo
Na 2B 10h 10 undergoes a transition from an ordered monoclinic phase to a disordered, face-centered-cubic phase near 370 K with the emergence of a vacancy-rich, mobile Na + sublattice exhibiting dramatic superionicity ({approximately equal}0.01 S cm -1 at

Anion Reorientations in the Superionic Conducting Phase of Na 2 B 12 H 12

August 7, 2014
Author(s)
Kristina Verdal, Terrence J. Udovic, Vitalie Stavila, Wan Si NMN Tang, John J. Rush, Alexander V. Skripov
Quasielastic neutron scattering (QENS) methods were used to characterize the reorientational dynamics of the dodecahydro-closo-dodecaborate (B 12H 126u2-^0 anions in the high-temperature, superionic conducting phase of na 2B 12H6d12^. The icosahedral

Alkali Metal Hydride Modification on Hydrazine Boranes for Improved Dehydrogenation

May 29, 2014
Author(s)
Yong Shen Chua, Qijun Pei, Xiaohua Ju, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ping Chen, Hui Wu
Hydrazinoboranes of various alkali metals, i.e., NaN 2H 3BH 3 and KN 2H 3BH 3, were synthesized via a liquid approach. The crystal structures of NaN 2H 3BH 3 were determined and their dehydrogenation properties were compared with LiN 2H 3BH 3 and N 2H 4BH

Sodium Superionic Conduction in Na 2 B 12 H 12

April 11, 2014
Author(s)
Terrence J. Udovic, Matoaki Matsuo, Atsushi Unemoto, Kristina Verdal, Vitalie Stavila, Alexander V. Skripov, John J. Rush, Hitoshi Takamura, Shin-Ichi Orimo
The need for cheaper, Li-free battery technologies has prompted the search for new Na-ion-based electrolyte materials. One such material, Na 2B 12H 12, undergoes an entropy-driven transition upon heating from an ordered monoclinic structure to a disordered

Determination of the Effective Transverse Coherence of the Neutron Wave Packet as Employed in Reflectivity Investigations of Condensed-Matter Structures. I. Measurements

March 27, 2014
Author(s)
Charles F. Majkrzak, Christopher Metting, Brian B. Maranville, Joseph A. Dura, Sushil K. Satija, Terrence J. Udovic, Norman F. Berk
The primary purpose of this investigation is to determine the effective coherent extent of the neutron wave packet transverse to its mean propagation vector k, as prepared in a typical instrument used to study the structure of materials in thin film form

Mapping Trends in the Reorientational Mobilities of Tetrahydroborate Anions via Neutron-Scattering Fixed-Window Scans

December 15, 2013
Author(s)
Terrence J. Udovic, Kristina Verdal, John J. Rush, Daniel De Vries, Michael R. Hartman, John J. Vajo, Adam F. Gross, Alexander V. Skripov
The reorientational dynamics of BH 4 anions in a variety of environments of environments were measured as a function of temperature via fixed-window scans (FWSs) at zero energy transfer using a neutron backscattering spectrometer. The temperature

Nuclear Magnetic Resonance Study of Atomic Motions in A 2 B 12 H 12 (A = Na, K, Rb, Cs): Anion Reorientations and Na +} Mobility

November 22, 2013
Author(s)
Alexander V. Skripov, Olga A. Babanova, Alexei V. Soloninin, Vitalie Stavila, Kristina Verdal, Terrence J. Udovic, John J. Rush
To study the reorientational motion of icosahdral [B 12H 12] 2- anions and the translational diffusion of alkali-metal (A +) cations in A 2^B 12H 12 (A = Na, K, Rb, Cs), we have measured the 1H, 11B, and 23Na NMR spectra and spin-lattice relaxation rates

Structure Determination of a Polymeric Amorphous Chain Compound AlB 4 H 11

August 21, 2012
Author(s)
Xuenian Chen, Yongsheng Zhang, Yongli Wang, Wei Zhou, Douglas A. Knight, Teshome B. Yisgedu, Zhenguo Huang, Hima K. Lingam, Beau Billet, Terrence J. Udovic, Gilbert M. Brown, Sheldon G. Shore, Christopher M. Wolverton, Ji-Cheng Zhao
The structure of the amorphous aluminoborane compound AlB 4H 11 was identified through a collaborative study closely coupling theoretical predictions via the PEGS+DFT approach with experimental measurements using IR, NMR, and neutron vibrational

Hydrogen Species Motion in Piezoelectrics: A Quasi-Elastic Neutron Scattering Study

March 5, 2012
Author(s)
K. J. Alvine, Madhu Sudan Tyagi, Craig Brown, Terrence J. Udovic, T. Jenkins, S. G. Pitman
Hydrogen is known to damage or degrade piezoelectric materials, at low pressure for ferroelectric random access memory applications, and at high pressure for hydrogen powered vehicle applications. The piezoelectric degradation is in part governed by the