rare earth potassium

Reactions of hypersilyl potassium with rare-earth metal ...

The scope of hypersilyl potassium, KHyp [Hyp = Si(SiMe3)3], as a silylation or deprotonation agent for some rare-earth bis(trimethylsilyl)amides has been explored.

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Reactions of Hypersilyl Potassium with Rare-Earth Metal ...

Reactions of Hypersilyl Potassium with Rare-Earth Metal Bis(Trimethylsilylamides): Addition versus Peripheral Deprotonation. Mark Niemeyer; View Author Information. Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany .

Crystal structures and comparisons of potassium rare …

DOE PAGES Journal Article: Crystal structures and comparisons of potassium rare-earth molybdates KRE(MoO 4) 2 (RE = Tb, Dy, Ho, Er, Yb, and Lu)

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Argon sealed sample of 1 gram completely shiny. This sample of potassium metal is absolutely rare and it is a must have for every element collectors. Pure and Safe Potassium metal oxide free sample for element collection, display and …

Potassium, Rubidium, Strontium, Barium, and Rare-Earth ...

Potassium and rubidium are at chondritic levels, strontium at 15 times, and barium and rare earths at 30 to 100 times chondritic levels. There are trace element similarities between the lunar samples and basaltic achondrites, terrestrial dredge basalts and the bulk earth.

Physical and electrical properties enhancement of rare ...

Physical and electrical properties enhancement of rare-earth doped-potassium sodium niobate (KNN): a review Ceramics – Silikáty 59 (2) 158-163 (2015) 163 …

The study of activity of rare-earth doped four potassium ...

The results showed that the photocatalytic activity was better when potassium titanate whiskers were calcinated at 600℃ without rare-earth doping. The effect of potassium titanate whiskers doped neodymium ion was the best, the degradation rate could increase to 59.0%.

The importance of the counter-cation in reductive rare ...

The use of 18-crown-6 (18-c-6) in place of 2.2.2-cryptand (crypt) in rare earth amide reduction reactions involving potassium has proven to be crucial in the synthesis of Ln(ii) complexes and isolation of their CO reduction products. The faster speed of crystallization with 18-c-6 appears to be important. Pr

Steven D. Jacobsen – Mineral Physics and High-Pressure ...

New rare-earth perovskite Potassium niobate found as inclusion in diamond and named after V.M. Goldschmidt . HyMaTZ Detecting water in the mantle transition zone . Geophysics. Earth science encompasses the physics, chemistry, and biology of the planet, while appreciating its beauty Mineralogy. The Earth's chemistry is contained within minerals ...

The Study of Activity of Rare-Earth Doped Four Potassium ...

In this paper, the high temperature was adopted to treat the composited photocatalysts. The effects of different heat treatment temperature, rare-earth and concentration rare-earth on photocatalytic activity were investigated. The results showed that the photocatalytic activity was better when potassium titanate whiskers were calcinated at 600 0C without rare-earth doping.

Terahertz lattice dynamics of the potassium rare-earth ...

Binary molybdates with a general chemical formula MRe(MoO 4) 2, where M + is an alkali metal ion and Re 3+ is rare-earth ion, have the characteristic feature of strong coupling between the electronic excitations of Re 3+ and phonons. This coupling together with strong anisotropy of Re 3+ electronic excitations causes structural phase transitions induced by an …

Potassium chloride and rare earth elements improve …

of rare earth elements, Ce and La on the efﬁciency of Agrobacterium-mediated plant transformation. We found that exposure to KCl, CeCl 3 and LaCl 3 leads to an increase in recombination frequency in Arabidopsis and tobacco. Plants grown in the presence of CeCl 3 and LaCl 3 had higher biomass, longer roots and greater root number.

ON THE SOLUBILITY OF RARE EARTH HYDROXIDES IN …

Solubility of Rare Earth Hydroxides in Aqueous Sodium Potassium Tartrate 317 undissolved after treatment with Rochelle salt solution. The quantity measured was the weight of oxide in the filtrate. This was done by igniting the precipitated oxalate and also by titrating its sulphuric acid solution

Optically active uniform potassium and lithium rare earth ...

This paper reports the first systematical synthesis of near-monodisperse potassium and lithium rare earth (RE) fluoride (K(Li)REF4) nanocrystals with diverse shapes (cubic KLaF4 and KCeF4 wormlike nanowires, nanocubes and nanopolyhedra; cubic LiREF4 (RE = Pr to Gd, Y) nanopolyhedra; tetragonal LiREF4 (RE = Tb to Lu, Y) rhombic nanoplates) via co-thermolysis …

Rare earth element-bearing tausonite and potassium …

Rare earth element-bearing tausonite and potassium barium titanates from the Little Murun potassic alkaline complex, Yakutia, Russia - Volume 57 Issue 389

Spectroscopic investigation of rare earth activated ...

This study investigates the spectroscopic properties of rare earth activated potassium calcium pyrophosphate K 2 Ca 1-x RE x P 2 O 7 (RE = Tb 3+, Dy 3+, Sm 3+ and Eu 3+) phosphors synthesized by a solid-state reaction method.The synthesized phosphor samples were characterized by powder X-ray diffraction, Scanning electron microscope, Fourier transform …

The behaviour of the rare earths during the precipitation ...

The results indicate that higher concentrations of the rare earth elements can be present in the potassium systems without the precipitation of alkali-rare earth sulphate phases, such as KLa(SO 4) 2 ·H 2 O, than is the situation in the corresponding sodium system. Even for rare earth concentrations as high as 1.0 g/L, however, it does not ...

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Crystal structures and comparisons of potassium rare …

Six potassium rare-earth molybdates KRE(MoO4)2 (RE = Tb, Dy, Ho, Er, Yb, and Lu) were synthesized by flux-assisted growth in K2Mo3O10. The crystal structures were determined using single-crystal X-ray diffraction data. The synthesized molybdates crystallize within the orthorhombic Pbcn space group (No. 60). The unit-cell parameters a and c increase linearly …

(PDF) Rare earth element mobility in and around ...

Rare earth element mobility in and around carbonatites controlled by sodium, potassium, and Michael Anenburg, John A. Mavrogenes, Corinne Frigo and Frances Wall DOI: 10.1126/sciadv.abb6570

Rare Earth Reference for Wavelength in the Far UV, NIST ...

The Rare Earth reference is measured against an air blank. Periodically check the spectra. The periodic use of your Rare Earth cell will build a log of your instrument's wavelength accuracy for use with certification and troubleshooting should the correlation change over time. Absorbance Scan of Rare Earth Interpertation of Results

Rare-Earth Elements - USGS

Rare-Earth Elements. By Bradley S. Van Gosen, Philip L. Verplanck, Robert R. Seal II, Keith R. Long, and Joseph Gambogi Chapter O of. Critical Mineral Resources of the United States—Economic and

The development of rare earth element-labelled potassium ...

Rare earth elements sorbed by cation exchange may be subsequently desorbed where ionic strength of the surrounding solution is high. The highest capacities for cation exchange are associated with clay minerals that contain hydrated interlayer cations, namely smectites and …