Results 11 to 20 of about 2,032 (202)

Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses

Geosciences, 2018
Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass ...
Marian V. Lupulescu, Jeffrey R. Chiarenzelli, Mark E. Pecha, Jared W. Singer, Sean P. Regan   +4 more
doaj   +2 more sources

Influence of synthesis and processing parameters of the columbite precursor on the amount of Perovskite PMN

Materials Research, 1999
Columbite route for synthesis of P3MgNb2O9 (PMN) allows the suppression of secondary phases in PMN powders. These phases, having low dielectric constant, affect negatively the dielectric properties of PMN ceramics. Aiming to get reactive PMN powders, the
A.A. Cavalheiro, M.A. Zaghete, C.O. Paiva Santos, J.A. Varela, E. Longo   +4 more
doaj   +2 more sources

FeNb₂O₆ as a High-Performance Anode for Sodium-Ion Batteries Enabled by Structural Amorphization Coupled with NbO₆ Local Ordering. [PDF]

Adv Mater
FeNb2O6 is applied for the first time as a high‐performance anode material for sodium‐ion batteries. The presence of iron disrupts the long‐range order by local disorder of the FeO6 octahedra during initial sodiation. Simultaneously, the formation of short‐range ordered zigzag‐chain structures within the NbO6 planes establishes a robust intercalation ...
Liu Y, Guilherme Buzanich A, Alippi P, Montoro LA, Lee KS, Jeon T, Weißer K, Karlsen MA, Russo PA, Pinna N.   +9 more
europepmc   +2 more sources

Data for some African columbite-tantalite specimens [PDF]

Bulletin of the Geological Society of Finland, 1975
Twenty-three specimens from equatorial and southern Africa are investigated, primarily for X-ray powder data. Unit cell dimensions and volume, ranging from 414.7 Å3 (columbite) to 424.1 Å3 (manganotantalite) are given. A correlation between the unit cell
G.A.D. Zelt
doaj   +1 more source

Columbite Single-Crystal CoV₂O₆ under High Pressure: An XRD and Raman Spectroscopy Study. [PDF]

J Phys Chem C Nanomater Interfaces
International audienceThe application of high pressure to columbite CoV2O6 resulted in two phase transitions, characterised by single-crystal X-ray diffraction and Raman spectroscopy up to 54.9(1) GPa.
Sánchez-Martín J, Bouvier P, Garbarino G, Gallego-Parra S, Isnard O, Rodríguez-Hernández P, Muñoz A, Errandonea D, Pellicer-Porres J.   +8 more
europepmc   +2 more sources

Features of berillium and rare metal mineralization  in syenite of the Perga deposit (Ukrainian shield)

Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія, 2020
The results of the ore and accessory minerals study in the syenite of the Perga beryllium deposit are discussed. Phenakite and genthelvite are found among Be-bearing minerals.
O. Dubyna, S. Kryvdik, V. Belskyy, О. Vyshnevskyi   +3 more
doaj   +1 more source

Atomistic Insights into the Electrochemical Oxygen Evolution Activity of Hollandite IrO₂ Surfaces. [PDF]

Adv Sci (Weinh)
Lattice distortions at tunnel‐structured hollandite IrO2 surfaces reshape Ir‐O bonding: they weaken the σ‐bond contribution in the Ir‐*OH bond while enhancing the π contribution of the Ir‐*O bond. This orbital reorganization in hollandite surfaces stabilizes *O, facilitates the *OH → O step, and lowers the oxygen‐evolution reaction overpotential ...
Lee S, Kang K, Lee T, Soon A.
europepmc   +2 more sources

Multi-Force-Driven Self-Recoverable SWIR Mechanoluminescence for Underwater Communication. [PDF]

Adv Sci (Weinh)
This study represents the first demonstration of self‐recoverable mechanoluminescent (ML) within a single material across diverse mechanical modes, enabled by the synergistic coupling of piezoelectric and triboelectric effects. Through a combinatorial doping approach, the MgNb2O6 crystal exhibits breakthrough short‐wavelength infrared ML performance ...
Sun J, Li Y, Wang L, Li L, Zhao B, Wang Y, Zhang Y, Zheng X, Zhang J, Wen X, Zhang G, Wang Z, Li P, Suo H.   +13 more
europepmc   +2 more sources

ACCESSORY NIOBIUM-TANTALUM MINERALS OF THE ALEISK GRANITE MASSIF (N-W RUDNY ALTAY AREA)

Известия Томского политехнического университета: Инжиниринг георесурсов, 2020
Relevance of the research. Accessory niobioum-tantalum mineralization of granitoids is an important additional feature at detecting potential rare-metal ore content of leucogranites, which are the derivatives of the final stage of polyphase Aleisk ...
Konstantin L. Novoselov
doaj   +1 more source

Influence of Synthesis-Related Microstructural Features on the Electrocaloric Effect for 0.9Pb(Mg_1/3Nb_2/3)O₃–0.1PbTiO₃ Ceramics

Crystals, 2021
Despite having a very similar electrocaloric (EC) coefficient, i.e., the EC temperature change divided by the applied electric field, the 0.9Pb(Mg1/3Nb2/3)O3–0.1PbTiO3 (PMN-10PT) ceramic prepared by mechanochemical synthesis exhibits a much higher EC ...
Hana Uršič, Marko Vrabelj, Mojca Otoničar, Lovro Fulanović, Brigita Rožič, Zdravko Kutnjak, Vid Bobnar, Barbara Malič   +7 more
doaj   +1 more source