Results 91 to 100 of about 2,032 (202)

The synthesis, properties, and applications of columbite niobates (M 2+Nb2O6): A critical review

, 2009
The binary niobate ceramics, with the formula M2+Nb 2O6 where M2+=Ca, Mg, or a transition metal (TM), have the orthorhombic columbite structure. The best-known members of this group are zinc niobate (ZnNb2O6) and magnesium niobate (MgNb2O6), but Ca, Co ...
Pullar R. C.
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Mechanism of anatase-to-columbite TiO2 phase transformation via sheared phases: first-principles calculations and high-pressure torsion experiments [PDF]

High-pressure torsion (HPT) can facilitate phase transformations in titanium dioxide (TiO2) and stabilize its high-pressure columbite phase, as an active photocatalyst, by shear straining under high pressure.
Ikeda, Yuji, Ishihara, Tatsumi, Hidalgo-Jimenez, Jacqueline, Akbay, Taner, Edalati, Kaveh   +4 more
core   +1 more source

Implications of U-Pb ages of columbite-tantalites from granitic pegmatites for the Palaeoproterozoic accretion of 1.90-1.85 Ga magmatic arcs to the Baltic Shield

, 1994
The Palaeoproterozoic growth of the Baltic Shield involved the accretion of several ~1.90-1.85 Ga old magmatic arcs to the southwest of the Archaean craton and the deformation and migmatization of sedimentary basins located between the arcs.
Romer, Rolf,, Smeds, Sten-Anders,
core   +1 more source

Estudio de PMN cerámico dopado con KNbO₃ y LiNbO₃ sintetizado por Pechini

Boletín de la Sociedad Española de Cerámica y Vidrio, 2002
PMN belongs to a special class of materials named relaxor ferroelectrics. It has high volumetric efficiency due to its high dielectric constant, which makes it in a perfect material for application in multilayer capacitors.
Cilense, M., Paiva-Santos, C. O., Zaghete, M. A., Cavalheiro, A. A., Varela, J. A.   +4 more
doaj  

MAGNETITE- AND ILMENITE-SERIES OF GRANITIC ROCKS AND THEIR POTENTIAL NIOBIUM AND TANTALUM MINERALIZATION WITHIN THE UKRAINIAN SHIELD

Вісник Київського національного університету імені Тараса Шевченка. Серія Геологія
The paper discusses differentiating between different types of granites that occur within the territory of the Ukrainian Shied. The classification in the article partly follows the principles formulated in the early taxonomies of granites, among which ...
O. Grinchenko, S. Bondarenko, І. Ashirova, T. Mironchuk   +3 more
doaj  

Cleavelandite, Spodumene, Montebrasite, Elaibte, Columbite, Lepidolite, Montmor., Pollucite, and Petalite, etc. ! at Mt. Marie. View to the WSW.

, 1996
Cleavelandite, Spodumene, Montebrasite, Elaibte, Columbite, Lepidolite, Montmor., Pollucite, and Petalite, etc. ! at Mt. Marie.
Thompson, Woodrow B
core  

Synthesis and characterization of 0.9PMN-0.1PT powders by the use of a modified columbite precursor

, 2005
The complex perovskite compound 0.9PbMg 1/3Nb 2/3O 3-0.1PbTiO 3 is one of the most promising relaxor ceramic because the addition of lead titanate increases T m, by about 5°C/mol% from intrinsic T m value for pure PMN (near -7 to -15°C).
Cavalheiro, A. A., Zaghete, M. A., Cilense, M., Bruno, J. C., Varela, José Arana   +4 more
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Dielectric response of ANb2O6 (A = Zn, Co, Mn, Ni) columbite niobates: From microwave to terahertz

Journal of Advanced Ceramics
In the upcoming 6-generation (6G) revolution, the achievement of low power consumption has become a key objective in research concerning terahertz devices.
Weijia Luo, Shun Wang, Siyong Zheng, Jining Li, Menglong Wang, Yongzheng Wen, Lingxia Li, Ji Zhou   +7 more
doaj   +1 more source

LV. On the acid contained in the North American columbite [PDF]

The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
n ...
openaire   +2 more sources

Enhanced dissolution of tantalite/columbite following milling

International Journal of Mineral Processing, 2001
Abstract A tantalum/niobium concentrate has been ball-milled for up to 50 h in a laboratory mill without apparent phase change, other than a decrease in unit cell symmetry and some amorphisation. The extent of dissolution in a mixture of hydrochloric acid and sodium fluoride increased with milling time.
openaire   +2 more sources