A5068579759- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Advanced Thermoelectric Materials and Devices
- Iron-based superconductors research
- Chalcogenide Semiconductor Thin Films
- Thermal Expansion and Ionic Conductivity
- Quantum Dots Synthesis And Properties
- Crystal Structures and Properties
- Inorganic Chemistry and Materials
- Rare-earth and actinide compounds
- Thermal properties of materials
- 2D Materials and Applications
- MXene and MAX Phase Materials
- Advanced Condensed Matter Physics
- Advanced Battery Materials and Technologies
- Perovskite Materials and Applications
- Physics of Superconductivity and Magnetism
- Superconductivity in MgB2 and Alloys
- Nanomaterials for catalytic reactions
- Optical properties and cooling technologies in crystalline materials
- Topological Materials and Phenomena
- Chemical Synthesis and Characterization
- Layered Double Hydroxides Synthesis and Applications
- High Entropy Alloys Studies
- Metal Extraction and Bioleaching
Iowa State University
2018-2025
Ames National Laboratory
2020-2025
Colorado School of Mines
2024-2025
United States Department of Energy
2022
Laboratoire de Cristallographie et Sciences des Matériaux
2020
Centre National de la Recherche Scientifique
2020
In this paper, we explore the drastic differences in transport properties and catalytic activities for two structural polymorphs of NiP2: cubic (Pa3; No. 205) monoclinic NiP2 (C2/c; 15). The former one has been long assumed to be high-pressure metastable phase, as it had originally synthesized through methods. Synthetic situ synchrotron X-ray diffraction studies unambiguously show that polymorph can at ambient pressure but irreversibly transforms into structure above 876 K. Band calculations...
Abstract Noncentrosymmetric (NCS) tetrel pnictides have recently generated interest as nonlinear optical (NLO) materials due to their second harmonic generation (SHG) activity and large laser damage threshold (LDT). Herein nonmetal‐rich silicon phosphides RuSi 4 P IrSi 3 are synthesized characterized. Their crystal structures reinvestigated using single X‐ray diffraction 29 Si 31 magic angle spinning NMR. In agreement with previous report crystallizes in NCS space group 1, while is found...
The family of chiral, noncentrosymmetric, quaternary sulfides R6(TM)x(E)2Q14 (R = rare-earth metal; TM transition E Si, Ge, Sn, Al, or Ga; and Q S Se) presents an exciting opportunity for exploration their magnetic characteristics. properties these materials are directly influenced by the specific R elements present in sublattices. However, since concentration is low (1 out 23 atoms) with 50% partial occupancy, it unclear whether how TMs contribute to overall magnetism compounds. To...
Abstract This study demonstrates a rapid, dry, microwave‐assisted (MW) synthesis method that enables preparation of halide argyrodites ( , ) in less than 20 min. The structures and ion transport properties the resulting materials are compared with those synthesized by conventional solid‐state methods. leads to increased site disorder elevated Arrhenius prefactors (), which lead an order magnitude improvement 30 ionic conductivity MW‐. X‐ray pair distribution function analysis (XPDF) reveals...
Aliovalent substitution is a ubiquitous strategy to increase ionic conductivity in solid-state electrolytes, often by many orders of magnitude. However, the structural and compositional changes that occur upon aliovalent are highly interrelated, deep understanding how substitutions simultaneously impact ion transport chemical evolution interfaces during electrochemical cycling remain as prevailing challenges. Here, we interrogate pnictogen Li4GeS4 series Li3.7Ge0.7Pn0.3S4 (Pn = P, As, Sb)...
The synthesis, structures, and properties of two quaternary barium‐arsenide materials are presented. first, Ba4Ag2.3In1.7As8, is a novel material with the monoclinic unit cell (P21/m space group). layered crystal structure Ba4Ag2.3In1.7As8 may be considered lower‐symmetry, distorted analog LaCuSb2 structure. features rare As fragment, cis‐trans chains along [010] direction. Large crystals can grown from Bi flux were used for subsequent transport property measurements. We report electrical...
Synthesis from atomically-mixed precursors opens up a phase space to hundreds of chiral and polar sulfide semiconductors with almost any transition metal in variable oxidation states.
The low-temperature modification of β-Ag2Se has proven to be useful as a near-room-temperature thermoelectric material. Over the past years, research been devoted interstitial, vacancy, and substitutional doping into parent structure, aiming at tuning material's charge heat transport properties enhance performance. transformation α-Ag2Se ∼134 °C low solubility dopants are main obstacles for approach. Herein, we report facile, safe, scalable, cost-effective benchtop approach successfully...
Alkali pnictogen dichalcogenides─I–V–VI2 or APnCh2─have been identified as promising semiconducting materials for energy conversion devices. However, the controlled nanoscale synthesis and our understanding of effects cation ordering stereochemically active lone pairs on structures these ternary compounds remain underdeveloped. Here, we use solution-phase chemistry to synthesize a family APnCh2 materials, including LiSbSe2, NaSbS2, NaSbSe2, NaBiS2, NaBiSe2. Our approach utilizes alkali metal...
The zinc–antimony phase space has been heavily investigated due to the structural complexity and abundance of high-performing thermoelectric materials. Consequentially, desire use zinc antimony as framework elements encage rattling cations achieve phonon-glass-electron-crystal-type properties remained an enticing goal with only two alkali metal clathrates date, Cs8Zn18Sb28 K58Zn122Sb207. Guided by Zintl electron-counting predictions, we explored Ba–Zn–Pn (Pn = As, Sb) proximal expected...
Five novel Zintl phase solid solutions in the Ba1–xSrxZn2–yCdySb2 (0 ≤ x 0.13(1); 0 y 0.32(2)) system were successfully synthesized by molten Pb metal-flux method, and powder X-ray diffraction single-crystal analyses proved that all five title compounds adopted BaCu2S2-type having orthorhombic Pnma space group (Z = 4, Pearson code oP20) with crystallographically independent atomic sites. The previously studied antimonides demonstrated a limited tolerance for doping contrast to CaAl2Si2-type...
Semiconducting pnictides with a ThCr 2 Si type structure were realized via mixing Cu and group 13 elements (Al, Ga, In) in the metal site.
Two novel ternary compounds in a La–Zn–P system, La2Zn11P9 and La7Zn2P11, were synthesized via high-temperature transport reactions. The crystal structures for both established by means of single X-ray diffraction. complex three-dimensional (3D) structure metal-rich La3Zn2P4 is composed Zn–P framework with large channels accommodating four atomic columns La atoms. isolated atoms alternating tetrahedral chains disordered P3 chains, resembling polyacene fragments, build up the phosphorus-rich...
Abstract Non‐linear optical materials must possess a balanced combination of laser‐induced damage threshold (LDT) and second‐harmonic generation (SHG) be phase matchable. In our previous work, chiral polar La 3 CuGeS 7 was identified as promising non‐linear material. Herein, we report the optimization properties through replacement with smaller lanthanides. It is determined that Gd exhibits best SHG (1.6× AgGaS 2 at 88–105 μm particle size) LDT (3× , 89 MW/cm ) Based on changes in...
A series of Eu-doped Zintl compounds belonging to the Ca5–x–yYbxEuyAl2Sb6 (x = 0, 1.12; 0 ≤ y 0.63(2)) system have been successfully synthesized by both arc-melting and molten Pb-flux methods. All five title initially crystallized in Ca5Ga2As6-type phase (space group Pbam, Z 2, Pearson code oP26) maintained their original structure even after post-heat treatment, unlike recently reported n-type analogues Ca5–x–yYbxREyAl2Sb6 (RE Pr, Nd, Sm) systems, which underwent a transition from...
Non-centrosymmetric semiconductors may exhibit non-linear optical (NLO) properties.
The inertness of elemental selenium is a significant obstacle in the synthesis selenium-containing materials at low reaction temperatures. Over years, several recipes have been developed to overcome this hurdle; however, most methods are associated with use highly toxic, expensive, and environmentally harmful reagents. As such, there an increasing demand for design cheap, stable, nontoxic reactive precursors usable low-temperature transition metal selenides vast applications nanotechnology,...
Intermetallic compounds are atomically ordered inorganic materials containing two or more transition metals and main-group elements in unique crystal structures. Intermetallics based on group 10 14 have shown enhanced activity, selectivity, durability comparison to simple alloys many catalytic reactions. While high-temperature solid-state methods prepare intermetallic exist, softer synthetic can provide key advantages, such as enabling the preparation of metastable phases smaller particles...
Giant clathrate supercell driven by ordering of Zn/Sb bonding in the framework and Cs-guest vacancies is found unconventional Cs<sub>8</sub>Zn<sub>18</sub>Sb<sub>28</sub>.
The nickel chalcogenide family contains multiple phases, each with varying properties that can be applied to an expansive range of industrially relevant processes. Specifically, pyrite-type NiS2 and NiSe2 have been used as electrocatalysts for oxygen or hydrogen evolution reactions. These pyrites also in batteries solar cells due their optoelectronic transport properties. phase pyrite polymorphism briefly studied the literature, but there has limited work focusing on transformations within...
[Fe(en)(tren)][FeSe2]2 (en = ethylenediamine, C2H8N2, tren tris(2-aminoethyl)amine, C6H18N4) has been synthesized by a mixed-ligand solvothermal method. Its crystal structure contains heteroleptic [Fe(en)(tren)]2+ complexes with distorted octahedral coordination, incorporated between 1D-FeSe2 chains composed of edge–sharing FeSe4 tetrahedra. The twisted coordination environment the Fe–amine complex leads to partial dimerization Fe–Fe distances in FeSe2 so that polyhedra deviate strongly from...