Results 211 to 220 of about 7,317 (263)

Actinide valences in xenotime and monazite

Journal of Nuclear Materials, 2011
Abstract Tetravalent U, Np and Pu can be substituted by ceramic methods into the rare earth site of xenotime and monazite in air atmospheres using Ca ions as charge compensators, while no evidence of penta- or hexavalent actinide ions was found. Some Pu3+ and Np3+ can be incorporated in xenotime samples fired in a reducing atmosphere.
E.R. Vance, Y. Zhang, T. McLeod, J. Davis   +3 more
openaire   +1 more source

Polymetamorphic events in the Jiao-Liao-Ji Belt, North China Craton：Evidence from integrated zircon, xenotime, and monazite LA–ICP–MS U–Pb dating

, 2021
Poly-metamorphism has been observed in many Precambrian metamorphic terranes. The metamorphic overprinting in the poly-metamorphic rocks makes it difficult to determine the timing and P − T path of each metamorphic event.
Pinghua Liu, Fu-Lai Liu, Zhonghua Tian, D. Wang, Jia Cai, Wen Zhang   +5 more
semanticscholar   +1 more source

Diagenetic and Epigenetic Mineralizing Events in the Kalahari Copperbelt, Botswana: Evidence from Re-Os Sulfide Dating and U-Th-Pb Xenotime Geochronology

, 2021
The ages of sedimentation and copper-silver mineralization in the late Meso- to Neoproterozoic Kalahari Copperbelt in Botswana, an economically significant copper province, have previously been poorly constrained within an ~600 m.y.
W. Hall, H. Stein, A. Kylander‐Clark, M. Hitzman, Y. Kuiper, Catherine Knight, M. S. Enders   +6 more
semanticscholar   +1 more source

X-ray-excited optical luminescence imaging for on-site identification of xenotime

, 2021
The on-site identification of rare-earth-element (REE) bearing minerals prior to off-site quantitative analysis helps to efficiently develop mines that reserve REEs.
S. Imashuku, K. Wagatsuma
semanticscholar   +1 more source

Separation of thorium and uranium from xenotime leach solutions by solvent extraction using primary and tertiary amines

, 2020
This study addressed the development of a continuous countercurrent extraction-scrubbing-stripping technique using a mixture of primary and tertiary amines as an effective extractant for both thorium (Th) and uranium (U) to simultaneously separate them ...
N. Hưng, L. B. Thuan, T. Thanh, Masayuki Watanabe, Do Van Khoai, N. T. Thuy, Hoang Nhuan, Pham Quang Nhat Minh, Trần Hoàng Mai, Nguyen Van Tung, D. Tra, M. Jha, Jin-Young Lee, R. Jyothi   +13 more
semanticscholar   +1 more source

Thermally stable red emitting xenotime phosphate nanophosphors for displays

, 2020
The synthesis, structural and optical properties of the Ho3+/Tm3+/Yb3+ codoped xenotime YPO4 nanophosphors have been reported. The developed phosphors have been structurally characterized through XRD, FESEM, HRTEM, EDAX and FTIR analysis.
Lakshmi Mukhopadhyay, V. K. Rai
semanticscholar   +1 more source

Solubility of Monazite-Cheralite and Xenotime in Granitic Melts, and Experimental Evidence of Liquid-Liquid Immiscibility in Concentrating REE

, 2021
We provide new experimental data of monazite, xenotime and U-Th-bearing cheralite solubility in slightly peralkaline to peraluminous granitic melts using dissolution and reverse (i.e., recrystallisation after dissolution) experiments in water-saturated
M. V. Lichtervelde, P. Goncalvès, Aurélien Eglinger, A. Colin, J. Montel, N. Dacheux   +5 more
semanticscholar   +1 more source

Apatite, Monazite, and Xenotime in Metamorphic Rocks

Reviews in Mineralogy and Geochemistry, 2002
This chapter focuses on phosphates that are significant in metamorphic rocks. A quick survey of phosphate mineral descriptions at a commercial mineral web-site revealed over 500 phosphate mineral names. Remarkably, only three are common in metamorphic rocks: apatite, monazite, and xenotime, and this chapter is restricted to discussion of these minerals.
F. S. Spear, J. M. Pyle
openaire   +1 more source

Phase transformations in xenotime rare-earth orthophosphates

Acta Materialia, 2013
Abstract Xenotime rare-earth orthophosphates were made with compositions close to the xenotime–monazite phase boundary. Stress-driven phase transformations and their associated deformation mechanisms were characterized for these compositions by extensive conventional and high-resolution transmission electron microscopy.
R.S. Hay, P. Mogilevsky, E. Boakye
openaire   +1 more source

Flotation concentration of a xenotime pre-concentrate

Minerals Engineering, 1997
Abstract The world market for rare-earths elements is increasing due to the development of new products and applications, resulting in the need for technology to treat deposits having highly complex mineralogy, such as that of Pitinga, AM, Brazil, with estimated reserves of 146,960 t of rare-earths oxides (REO), including Y2O3.
C.A. Pereira, A.E.C. Peres
openaire   +1 more source