rare earth alkali

  • 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 …

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  • 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 …

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

    Rare earth activated alkali-alkaline earth borate phosphors for LEDs and SSLs 4.1. KCaBO 3 The phosphor materials based on borate host matrices have been the topic scientific interest due to their potential applications in optoelectronic research.

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  • Powerful X-rays reveal the birth of giant rare earth ...

    A new geochemical discovery could lead to a cleaner way to extract the rare earth elements needed for the transition to renewable energy. ... but instead include a lot of alkali metals (sodium and ...

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  • 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

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  • Carbonatite and Alkaline Intrusion-Related Rare Earth ...

    The rare earth elements are not as rare in nature as their name implies, but economic deposits with these elements are not common and few deposits have been large producers. In the past 25 years, demand for rare earth elements has increased dramatically because of their wide and diverse use in high-technology applications.

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  • Homologous Alkali Metal Copper Rare-Earth Chalcogenides ...

    Homologous Alkali Metal Copper Rare-Earth Chalcogenides A2Cu2nLn4Q7+n (n = 1, 2, 3) Chemistry of Materials ( IF 9.811) Pub Date :, DOI: 10.1021/acs.chemmater.2c00223

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  • Homologous Alkali Metal Copper Rare-Earth Chalcogenides ...

    Homologous Alkali Metal Copper Rare-Earth Chalcogenides A 2 Cu 2n Ln 4 Q 7+n (n = 1, 2, 3) Craig C. Laing Department of Chemistry, Northwestern University, Evanston, Illinois …

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  • 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 ...

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  • 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 …

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

    Alkalis and rare earth elements can trace environmental changes in speleothems. • Alkalis are associated with particles from soil or organic ligands depending on the climatic context. • Rare earth elements fractionation can distinguish bedrock or soil contribution. Abstract

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  • Powerful X-rays reveal the birth of giant rare earth ...

    S. Korean scientists develop protein absorbent that collects rare earth elements from steel slag ... but instead include a lot of alkali metals …

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  • CA2230716C - Rare-earth and alkali sulphide, method for ...

    The present invention relates to a rare earth and alkali sulfide, its preparation process and its use as a coloring pigment. This sulfide is characterized in that it corresponds to the formula: ABS2, in which A represents at least one alkali and B at least one rare earth and in that it is made up of grains of average size of at most 1, 5 .mu.m.

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  • Rare-earth element - Wikipedia

    The rare-earth elements (REE), 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 …

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  • 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 …

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  • Rare-earth element - Wikipedia

    Enriched deposits of rare-earth elements at the surface of the Earth, carbonatites and pegmatites, are related to alkaline plutonism, an uncommon kind of magmatism that occurs in tectonic settings where there is rifting or that are near subduction zones.

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  • Catalytic activity of rare earth and alkali metal promoted ...

    The CO 2 conversion and CO selectivity of alkali and rare earth promoted 5% Ni/Al 2 O 3 catalysts are presented in Fig. 8a–d, respectively. Results showed that addition of rare earth metal or alkali promoters decreased the catalytic activity at 400 °C, but at higher temperatures they exhibited almost the same activity and even higher.

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  • Catalytic activity of rare earth and alkali metal promoted ...

    10%The CO 2 conversion and CO selectivity of alkali and rare earth promoted 5% Ni/Al 2 O 3 catalysts are presented in Fig. 8a–d, respectively. Results showed that addition of rare earth metal or alkali promoters decreased the catalytic activity at 400 °C, but at higher temperatures they exhibited almost the same activity and even higher.

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  • 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.

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  • Granada Gold Hits Massive Rare Earth and Alkali Metals ...

    "The 1.6 kilometer step out along the Cadillac Break could potentially be a massive rare earth and alkali metals mineralized zone yet to be discovered which would greatly impact the value of the property. The company has 5.5 kilometers of east-west strike length to further explore along the Cadillac Break.

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