A5061951299- Nuclear materials and radiation effects
- Advanced Condensed Matter Physics
- Microwave Dielectric Ceramics Synthesis
- X-ray Diffraction in Crystallography
- Ferroelectric and Piezoelectric Materials
- Glass properties and applications
- Electronic and Structural Properties of Oxides
- Geological and Geochemical Analysis
- Radioactive element chemistry and processing
- Luminescence Properties of Advanced Materials
University of Tennessee at Knoxville
2017-2025
Centre National de la Recherche Scientifique
2023-2025
CentraleSupélec
2022-2025
Université Paris-Saclay
2023-2025
Laboratoire Structures, Propriétés et Modélisation des Solides
2022-2023
Laboratoire de Mécanique, Modélisation & Procédés Propres
2022
Knoxville College
2020
A wide variety of compositions adopt the isometric spinel structure (AB2O4), in which atomic-scale ordering is conventionally described according to only three structural degrees freedom. One, inversion parameter, traditionally defined as degree cation exchange between A- and B-sites. This exchange, a measure intrinsic disorder, fundamental understanding variation physical properties different compositions. Based on neutron total scattering experiments, we have determined that local...
Metastable phases can exist within local minima in the potential energy landscape when they are kinetically “trapped” by various processing routes, such as thermal treatment, grain size reduction, chemical doping, interfacial stress, or irradiation. Despite importance of metastable materials for many technological applications, little is known about underlying structural mechanisms stabilization process and atomic-scale nature resulting defective phase. Investigating ion-irradiated...
Pyrochlore (A2B2O7) is an important, isometric structure-type because of its large variety compositions and structural derivatives that are generally related to different disordering mechanisms at various spatial scales. The key understanding variations in properties, such as magnetic behavior or ionic conduction. Neutron X-ray total scattering methods were used investigate the degree disorder Ho2Ti2-x Zr x O7 (x = 0.0-2.0, Δx 0.25) solid solution series a function Zr-content, x. Ordered...
Abstract High‐alumina containing high‐level waste (HLW) will be vitrified at the Waste Treatment Plant Hanford Site. The resulting glasses, high in alumina, have distinct composition‐structure‐property (C‐S‐P) relationships compared to previously studied HLW glasses. These C‐S‐P determine processability and product durability of glasses therefore must understood. main purpose this study is understand detailed structural changes caused by Al:Si (Al + Na):Si substitutions a simplified nuclear...
The atomic structures of the lanthanide tantalates, Ln 3 TaO 7 , series (Ln = Pr, Tb, Dy, Ho, Tm, Yb) were systematically investigated using total scattering techniques.
Abstract The structural response of Dy 2 TiO 5 oxide under swift heavy ion irradiation (2.2 GeV Au ions) was studied over a range length scales utilizing neutron total scattering experiments. Refinement diffraction data confirms that the long-range orthorhombic structure is susceptible to beam-induced amorphization with limited crystalline fraction remaining after 8 × 10 12 ions/cm . In contrast, local atomic arrangement, examined through pair distribution function analysis, shows only...
Complex oxides that adopt the isometric spinel structure (AB2O4) are important for numerous technological applications and relevant certain geological processes, which involve exposure to extreme environments such as high pressures temperatures. Recent studies have shown changes caused by these complex depend on material length scale under consideration. In this study, we expanded approach behavior of spinels situ neutron total scattering experiments, coupled with pair distribution function...