Results 81 to 90 of about 2,032 (202)

Synthesis of 0.64Pb(Mg1/3Nb2/3)O3–0.36PbTiO3 ceramic near morphotropic phase boundary for high performance piezoelectric, ferroelectric and pyroelectric applications

Journal of Asian Ceramic Societies, 2016
A near MPB composition of 0.64PMN–0.36PT ceramic has been synthesized by solid-state reaction technique using columbite precursor. Sintering at 1030 °C resulted in a single perovskite phase with tetragonal structure having uniform and dense ...
Abid Hussain, Nidhi Sinha, Sonia Bhandari, Harsh Yadav, Binay Kumar   +4 more
doaj   +1 more source

Preparation of NiNb₂O₆ Columbite Ceramics by a Reaction-Sintering Process

, 2004
Preparation of NiNb2O6 columbite ceramics by a reaction-sintering process has been investigated. The mixture of raw materials was pressed and sintered into ceramics without any calcination stage involved.
Chao-Yang Shiue, Yi-Cheng Liou
core   +1 more source

Unusual Compression Behavior of Columbite TiO2 via First-Principles Calculations [PDF]

, 2010
The physical mechanisms behind the reduction in the bulk modulus of a high-pressure cubic TiO2 phase are revealed by first-principles calculations.
Yonjun Tian, Yonjun Tian (田永君, Xiang-feng Zhou (周向锋, Xiao Dong (董校, Lixin Zhang (张立新, Guang-Rui Qian, Lixin Zhang, Hui-Tian Wang, Guang-rui Qian (钱广锐, Xiang-Feng Zhou, Xiao Dong, Zhou, Xiang-Feng, Dong, Xiao, Wang, Hui-Tian, Tian, Yonjun, Qian, Guang-Rui, Zhang, Lixin   +16 more
core   +1 more source

U-Pb columbite-tantalite chronology of rare-element pegmatites using TIMS and Laser Ablation-Multi Collector-ICP-MS

, 2004
U-Pb isotopic analyses using TIMS and Laser Ablation-Multi Collector-ICP-MS were carried out on columbite-tantalite minerals from three suites of rare-element (Li, Cs, Ta) pegmatites in the Superior Province of Canada. Conventional TIMS analyses of these
Tindle, A.G., Smith, S. R., Noble, S. R., Romer, RL, Breaks, FW, Smith, S.R., Kelley, SP, Foster, G.L., Breaks, F.W., Smith, SR, Tindle, A, Noble, S.R., Noble, S, Kelley, S. P., Romer, R. L., Breaks, F. W., Romer, R.L., Horstwood, M., Horstwood, MSA, Kelley, S.P., Tindle, A. G., Foster, G. L., Foster, GL, A. G. Tindle, G. L. Foster, S. R. Smith, S. R. Noble, F. W. Breaks, M. Horstwood, R. L. Romer, S. P. Kelley   +30 more
core   +1 more source

Comparison of some physicochemical characterisation of columbite and tantalite samples from different locations in Nigeria

, 2011
A detailed physicochemical characterization of columbite and tantalite samples from different locations in Nigeria has been undertaken. Parameters such as moisture content, loss of mass on ignition, pH, and the specific gravity of columbite and ...
Adekola, Folahan A, Ayanda, Olushola Sunday   +1 more
core   +1 more source

Columbite-tantalite and garnet geochemistry in Evje-Iveland, South Norway

, 2016
A study of columbite-tantalite paragenesis and garnet chemistry in the mixed NYF+LCT pegmatite field of Evje-Iveland, South Norway. A detailed study of the muscovite rare-element REE pegmatite at Solås were done to better understand in-situ mineral ...
Lund, Mats
core  

Analysis of columbite from the environs of limoges [PDF]

The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science
n ...
openaire   +1 more source

Two generations of zoned crystals of columbite-group minerals from granitic aplite–pegmatite in the Gouveia area, central Portugal

, 2015
Columbite-group minerals from dykes and sills composed of both aplite and rare-element-class pegmatite in the Gouveia area show different zonation patterns.
Silva, Paulo Bravo, Neiva, Ana M.R., Gomes, C. Leal   +2 more
core   +1 more source

Сhromespinelides with zinc-bearing epigene rims from Devonian conglobreccia horizons of Ichet’yu placer-like occurrence (Middle Timan)

Литосфера, 2015
Study results of accessory zinc-bearing chromespinelides from Middle Devonian psephites of Pizhemskaya suite (D2pg) of Ichet’yu placer-like occurrence (Middle Timan) are represented.
Yu. V. Glukhov, B. A. Makeev, D. A. Varlamov, S. S. Shevchuk, S. I. Isaenko   +4 more
doaj   +2 more sources

Ore specialization of carbonatite complexes at the Urais and Timan

Литосфера, 2017
The ore specialization of carbonatite complexes of Urals-Timan region has been established: niobium and rare earth-niobium - for the Urals’ carbonatite complexes, the rare-earth - for carbonatites of Timan.
I. L. Nedosekova, D. A. Zamyatin, O. V. Udoratina   +2 more
doaj   +2 more sources