Formation and properties of solid solutions of zirconium dioxide with oxides of rare earth elements

Refractories ◽  
1963 ◽  
Vol 4 (5-6) ◽  
pp. 243-251
Author(s):  
�. K. Keler ◽  
A. B. Andreeva
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Solutions ◽  
Zirconium Dioxide

The Mutual Solubility of Salts of Rare Earth Elements

2015 ◽  
Vol 670 ◽  
pp. 82-88
Author(s):  
Vera A. Batyreva ◽  
Larisa S. Grigor’eva
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Solutions ◽  
Mutual Solubility ◽  
Pure Form ◽  
High Tech

Relevance of the work caused by necessity of expanding the database of the mutual solubility of salts of rare earth elements to create technologies for producing them in pure form for high-tech industries. The main aim of the study: was to investigate reciprocal solubility of lanthanum and erbium bromates and trichloroacetates in the water and the and to determine the conditions of solid solutions formation and the possibility of obtaining concentrates of lanthanum and erbium.

Zirconia – A Ceramic for Excess weapons Plutonium Wastes

1999 ◽  
Vol 556 ◽  
Author(s):  
W. L. Gong ◽  
W. Lutze ◽  
R. C. Ewing
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Metal Oxides ◽  
Solid Solutions ◽  
Binary Systems ◽  
Single Phase ◽  
Sol Gel ◽  
Neutron Absorber ◽  
Cubic Zirconia

AbstractWe synthesized a ceramic containing simulated excess weapons plutonium waste in solidsolution with zirconia (ZrO2)ss. ZrO2 has a large solubility for other metal oxides. More thantwenty binary systems AxOy- ZrO2 have been reported in the literature, including PuG2, rare earth elements, and oxides of metals contained in weapons plutonium wastes. We show that significant amounts of gadolinium (neutron absorber) and yttrium (stabilizer of the cubic modification) can be dissolved in ZrO2, together with plutonium (simulated by Th4+, Ce4+, or U4+) and impurities (e.g., Ca Mg, Fe, Si). Sol-gel and powder methods were applied to make homogeneous, single phase zirconia solid solutions. Pu waste impurities were completely dissolved in the solid solutions. In contrast to other phases, e.g., zirconolite and pyrochlore, yttrium stabilized cubic zirconia does not undergo amorphization upon irradiation.

scholarly journals Compositional Variability of Monazite–Cheralite–Huttonite Solid Solutions, Xenotime, and Uraninite in Geochemically Distinct Granites with Special Emphasis to the Strongly Fractionated Peraluminous Li–F–P-Rich Podlesí Granite System (Erzgebirge/Krušné Hory Mts., Central Europe)

Minerals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 127
Author(s):  
Karel Breiter ◽  
Hans-Jürgen Förster
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Solutions ◽  
Heavy Rare Earth Elements ◽  
Compositional Variability ◽  
Variscan Granites ◽  
Almost All ◽  
Ree Pattern ◽  
Highly Evolved ◽  
Comprehensive Study

A comprehensive study of monazite–cheralite–huttonite solid solutions (s.s.) and xenotime from the highly evolved, strongly peraluminous P–F–Li-rich Podlesí granite stock in the Krušné Hory Mts., Czech Republic, indicates that, with the increasing degree of magmatic and high-T early post-magmatic evolution, the content of the cheralite component in monazite increases and the relative dominance of middle rare earth elements (MREE) in xenotime becomes larger. Considering the overall compositional signatures of these two accessory minerals in the late Variscan granites of the Erzgebirge/Krušné Hory Mts., three types of granites can be distinguished: (i) chemically less evolved F-poor S(I)- and A-type granites contain monazite with a smooth, mostly symmetric chondrite-normalized (CN) rare-earth elements (REE) pattern gradually declining from La to Gd; associated xenotime is Y-rich (˃0.8 apfu Y) with a flat MREE–HREE (heavy rare earth elements) pattern; (ii) fractionated A-type granites typically contain La-depleted monazite with Th accommodated as the huttonite component, combined with usually Y-poor (0.4–0.6 apfu Y) xenotime characterized by a smoothly inclining, Yb–Lu-dominant CN-REE pattern; (iii) fractionated peraluminous Li-mica granites host monazite with a flat, asymmetric (kinked at La and Nd) CN-LREE pattern, with associated xenotime distinctly MREE (Gd–Tb–Dy)-dominant. Monazite and xenotime account for the bulk of the REE budgets in all types of granite. In peraluminous S(I)-type granites, which do not bear thorite, almost all Th is accommodated in monazite–cheralite s.s. In contrast, Th budgets in A-type granites are accounted for by monazite–huttonite s.s. together with thorite. The largest portion of U is accommodated in uraninite, if present.

The effects of the modification of the BST-system solid solutions with rare earth elements

2021 ◽  
Author(s):  
K.P. Andryushin ◽  
L.A. Shilkina ◽  
S.V. Khasbulatov ◽  
A.V. Nagaenko ◽  
S.I. Dudkina ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Solutions

Ab-initio study of the effect of rare-earth elements on the stacking faults of Mg solid solutions

2012 ◽  
Vol 29 ◽  
pp. 21-26 ◽  
Author(s):  
Quan Zhang ◽  
Tou-Wen Fan ◽  
Lin Fu ◽  
Bi-Yu Tang ◽  
Li-Ming Peng ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Ab Initio ◽  
Solid Solutions ◽  
Stacking Faults ◽  
Ab Initio Study

scholarly journals Механическое упрочнение наноструктурированных кристаллов Ba-=SUB=-0.9-=/SUB=-R-=SUB=-0.1-=/SUB=-F-=SUB=-2.1-=/SUB=- (R --- редкоземельные элементы): размерный эффект

2021 ◽  
Vol 63 (2) ◽  
pp. 255
Author(s):  
Н.И. Сорокин
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Solid Solutions ◽  
Point Defects ◽  
Cluster Size ◽  
Structural Type ◽  
Block Type ◽  
The Rare Earth

The effect of strong deviations from stoichiometry in the structural type of fluorite (CaF2) on the microhardness of Ba0.9R0.1F2.1 crystals (R is the rare earth elements La-Lu) has been studied. Mechanical hardening of heterovalent Ba0.9R0.1F2.1 solid solutions in comparison with the BaF2 matrix is due to the formation of nanosized clusters of point defects [Ba8R6F69], replacing structural fragments [Ba14F64] (block type of isomorphism). It was found that, with a decrease in the cluster size from [Ba8La6F69] to [Ba8Lu6F69], the microhardness of nanostructured Ba0.9R0.1F2.1 crystals increases by 73%.

scholarly journals Influence of rare earth elements (REEs) on the structure and optical properties of lithium zirconium phosphate (LZP)

CrystEngComm ◽  
2020 ◽  
Vol 22 (35) ◽  
pp. 5890-5899
Author(s):  
Gorodylova Nataliia ◽  
Kosinová Veronika ◽  
Šulcová Petra
Keyword(s):  
Optical Properties ◽  
Rare Earth ◽  
Optical Absorption ◽  
Rare Earth Elements ◽  
Solid Solutions ◽  
Zirconium Phosphate ◽  
Absorption Properties ◽  
Substitution Models ◽  
Lithium Zirconium

The objective of presented study was to verify the concept of the formation of the REE–LZP solid solutions according to two different substitution models and to examine optical absorption properties of the samples for pigment application.

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