Results 21 to 30 of about 2,032 (202)

High-Power Performance of Textured Piezoelectric Ceramics Through Synergistic A-Site Donor and B-Site Acceptor Doping. [PDF]

Small Methods
A/B‐site co‐doping combined with templated grain growth enables synergistic defect and domain engineering in textured PIN–PMN–PT ceramics. The approach simultaneously enhances piezoelectric response and mechanical quality factor, achieving a balanced soft–hard characteristic.
Kim M, Lee DG, Yoo IR, Min BJ, Choi YR, Kim HS, Hur S, Kang H, Nahm S, Ryu J, Yan Y, Baik JM, Cho KH, Song HC.   +13 more
europepmc   +2 more sources

Ilmenorutile and strüverite from Penikoja, Somero, SW Finland [PDF]

Bulletin of the Geological Society of Finland, 1970
This paper reports the occurrence of ilmenorutile (niobian rutile) and striiverite (tantalian rutile) in two specimens from the Penikoja pegmatite in Somero, SW Finland.
J. Siivola
doaj   +1 more source

Effect of the Addition of Potassium or Lithium on the Columbite Precursor Microstructure

Materials Research, 2002
Pechini method has been used to synthesize MN powders with stoichiometric control. By this method, K and Li-doped MN in the range from 0.1 to 5.0 mol% of dopants have been obtained at relatively lower temperatures than it is possible with the ...
Alberto A. Cavalheiro, Maria A. Zaghete, Carlos O. Paiva-Santos, José A. Varela   +3 more
doaj   +1 more source

Interplay of quantum criticality and geometric frustration in columbite [PDF]

Nature Physics, 2010
Motivated by CoNb2O6 (belonging to the columbite family of minerals), we theoretically study the physics of quantum ferromagnetic Ising chains coupled anti-ferromagnetically on a triangular lattice in the plane perpendicular to the chain direction.
Lee, SungBin, Kaul, Ribhu K., Balents, Leon   +2 more
openaire   +2 more sources

Granitoids, rare-metal pegmatites and Та-Nb mineralization of Shpoliano-Tashlyk ore area (Ingul megablock, Ukrainian shield)

Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія, 2018
Composition of granites, genetically associated pegmatites and superimposed metasomatites distributed within Shpoliano-Tashlyk ore area (Ingul megablock) is considered.
О. Hrinchenko, S. Bondarenko, T. Mironchuk   +2 more
doaj   +1 more source

Mineralogical and physical studies of low-grade tantalum-tin ores from selected areas of Rwanda

Results in Engineering, 2021
In this work, mineralogical and physical characterization of low-grade tantalum-tin ore-samples from Ntunga and Kamonyi of Rwanda were carried out using various techniques.
Jean Baptiste Habinshuti, Jeanne Pauline Munganyinka, Adelena R. Adetunji, Brajendra Mishra, Grace Ofori-Sarpong, Gbetoglo Charles Komadja, Himanshu Tanvar, Janvier Mukiza, Azikiwe P. Onwualu   +8 more
doaj   +1 more source

Rhombic-shaped nanodomains in columbite driven by contrasting cation order [PDF]

, 2011
Transient (non-equilibrium) microstructures in crystals may arise in an order-disorder phase transition that generates lattice strain. A two-phase field can develop if fluctuations of the order parameter lead to nucleation of an ordered phase in a ...
Brunelli, Michela, Tarantino, Serena C., Zema, Michele, Carpenter, Michael A., Ghigna, Paolo, Capitani, Giancarlo, Scavini, Marco, Scavini M., Marco Scavini, Ghigna P, Tarantino S C, Michael A. Carpenter, Ghigna P., Paolo Ghigna, Serena C. Tarantino, Capitani G, Zema M., Carpenter M. A., Zema M, Scavini M, Michela Brunelli, Brunelli M., S. C. Tarantino, P. Ghigna, Brunelli M, Giancarlo Capitani, M. Scavini, Michele Zema, G. Capitani, M. Brunelli, M. Zema, M. A. Carpenter, Capitani G., Tarantino S. C., Carpenter M A   +34 more
core   +3 more sources

Evaluation of the acid leaching technique for recovery of U3O8 and ThO2 in niobium/tantalum slag

Brazilian Journal of Radiation Sciences, 2023
This study presented the recovery of uranium oxide and thorium oxide from aluminothermic slag from the metallurgical processing of columbite – a niobium/tantalum mineral with the presence of U3O8 and ThO2 – from a mining-industrial facility.
Vanderlei Vilaça Moura, Talita Santos, Claubia Pereira   +2 more
doaj   +1 more source

MINERALOGICAL, GEOCHEMICAL AND RADIOACTIVE ASPECTS OF NUWEIBI BASEMENT ROCKS, CENTRAL EASTERN DESERT, EGYPT [PDF]

Delta Journal of Science, 2010
Nuweibi area is situated in the Central Eastern Desert, Egypt, covers an area of about 135km2. The field observations and the detailed petrographic study revealed that the mapped area is distinguished into several rock units: serpentinites, metasediments,
Sameh M. Mansour, Mohamed A. Wetait, Salah S. El-Balakssy   +2 more
doaj   +1 more source

Caustic potash assisted roasting of the Nigerian ferro-columbite concentrate and guanidine carbonate-induced precipitation: A novel technique for extraction of Nb–Ta mixed-oxides

Results in Engineering, 2022
The current study focuses on alkali-assisted roasting, dissolution, and recovery of mixed oxides of niobium (Nb) and tantalum (Ta) from a ferro-columbite concentrate collected from Jos Plateau in Nigeria. Alkali-assisted roasting and water-based leaching
Jean Baptiste Habinshuti, Jeanne Pauline Munganyinka, Adelana R. Adetunji, Brajendra Mishra, Himanshu Tanvar, Janvier Mukiza, Grace Ofori-Sarpong, Azikiwe Peter Onwualu   +7 more
doaj   +1 more source