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rare earth alkali

Partitioning of rare earth, alkali and alkaline earth ...

Concentrations of rare earth, alkali and alkaline earth elements in phenocryst and groundmass components of pyroclastic dacites have been measured. Mafic mineral rare-earth partition coefficients are much larger in these dacites than in more basic rocks. This may be due to differences in host ion concentrations in basic and acidic magmas.

Theta‐phase stabilization by rare‐earth and alkali ...

The incorporation of alkali or rare-earth dopants into the alumina structure further influences the thermal conversion and crystallization behavior. The Kissinger activation energy of the θ → α phase transition in Al 2 O 3 indicates an inhibitory effect of Eu 3+ and K + on the formation of the stable α phase, also confirmed by X-ray ...

Recent advances in rare earth doped alkali-alkaline earth ...

Rare earth activated alkali-alkaline earth borate phosphors for LEDs and SSLs4.1. KCaBO 3. The phosphor materials based on borate host matrices have been the topic scientific interest due to their potential applications in optoelectronic research. They have high transparency over a broad spectral range, flexibility in structure and durability ...

Exchange Processes in Shibasaki's Rare Earth Alkali Metal ...

Shibasaki's rare earth alkali metal BINOLate (REMB) catalysts (REMB; RE = Sc, Y, La – Lu; M = Li, Na, K; B = 1,1-bi-2-naphtholate; RE/M/B = 1/3/3) are among the most successful enantioselective catalysts and have been employed in a broad range of mechanistically diverse reactions. Despite the phenomenal success of these catalysts, several fundamental questions central to their reactivity ...

Rare earth and alkali elements in stalagmites, as markers ...

Alkaline-earth metal and rare-earth element incorporation control by ionic radius and growth rate on a stalagmite from the Chauvet Cave, Southeastern France Chem. Geol., 290 ( 2011 ), pp. 1 - 2), 1–11, 10.1016/j.chemgeo.2011.08.006

Periodic Table of the Elements, Alkali, Rare earth ...

Alkali, Rare earth, Transition, Alkali earth, Other metals, Nonmetals, Noble gases, Halogens. Solid, Liquid and Gas Elements. Code to add this calci to your website . Periodic Table of Elements. Periodic Table was first discovered in 1869 by Dmitry I. Mendeleyev. The elements are ...

The Rare Earth Content and Origin of Alkali-Rich Basalts ...

The rare earth content of alkali-rich, silica-undersaturated basalts erupted onto oceanic and continental plates is consistent with their derivation by slight amounts of partial melting of hydrous garnet peridotite at the top of the asthenosphere, within the low-velocity, low-Q zone of the mantle. The rare earths are fractionated during partial melting by retention of heavy rare earths ...

Study on extraction of rare earth elements from coal fly ...

The concentration of each rare earth element in leachate after alkali fusion was significantly improved, which is over two times larger than those of direct leaching. In terms of yttrium, the leaching concentration increased sharply from 8.93 ppm to 48.9 ppm, which increased by 5.48 times.

Rare-earth element - Wikipedia

The rare-earth elements, also called the rare-earth metals or (in context) rare-earth oxides, or the lanthanides (though yttrium and scandium are usually included as rare-earths) are a set of 17 nearly-indistinguishable lustrous silvery-white soft heavy metals. Scandium and yttrium are considered rare-earth elements because they tend to occur in the same ore deposits as the lanthanides and ...

Rare-earth distribution in alkali rocks from Oki-Dogo ...

Rare-earth, Sr and Ba abundances were determined for three basalts, one mugearite, one trachyandesite and five trachytes from Dogo, Oki Islands, Japan and Ca-rich clinopyroxene and feldspar phenocryst samples separated from them. It is concluded that rareearth, Sr and Ba abundance patters for basalts and three trachytes could be explained by crystallization differentiation of olivine basalt ...

Alkali metal and rare earth element evolution of rock ...

The magmatic evolution of these systems from a granitic source is reconstructed by means of alkali element and rare earth element (REE) analyses of rock-forming minerals (feldspars, micas and tourmaline), which represent a whole sequence of regional pegmatite zonation. The Gatumba pegmatite field (Rwanda, Central Africa) is chosen as case study ...

Carbonatite and Alkaline Intrusi on-Related Rare Earth ...

Verplanck, P.L., and Van Gosen, B.S., 2011, Carbonatite and alkaline intrusion-related rare earth element deposits─A deposit model: U.S. Geological Survey Open-File Report 2011–1256, 6 p. Any use of trade, product, or firm names is for descriptive purposes only and does not imply

Exchange Processes in Shibasaki's Rare Earth Alkali Metal ...

Shibasaki's rare earth alkali metal BINOLate (REMB) catalysts (REMB; RE = Sc, Y, La - Lu; M = Li, Na, K; B = 1,1-bi-2-naphtholate; RE/M/B = 1/3/3) are among the most successful enantioselective catalysts and have been employed in a broad range of mechanistically diverse reactions. Despite the phenom …

Alkaline earth metal - Wikipedia

The alkaline earth metals are six chemical elements in group 2 of the periodic table.They are beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). The elements have very similar properties: they are all shiny, silvery-white, somewhat reactive metals at standard temperature and pressure.. Structurally, they (together with helium) have in common an outer s ...