Some Solid Solutions of the Rare Earth Sulfides in Strontium Sulfide

1949 ◽  
Vol 96 (5) ◽  
pp. 304 ◽  
Author(s):  
Harry L. Yakel ◽  
Ephraim Banks ◽  
Roland Ward
Keyword(s):  
Rare Earth ◽  
Solid Solutions ◽  
Strontium Sulfide ◽  
The Rare Earth

scholarly journals Crystallochemical Design of Huntite-Family Compounds

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 100 ◽  
Author(s):  
Galina Kuz’micheva ◽  
Irina Kaurova ◽  
Victor Rybakov ◽  
Vadim Podbel’skiy
Keyword(s):  
Rare Earth ◽  
Solid Solutions ◽  
Materials Science ◽  
Structural Features ◽  
Effective Option ◽  
Space Symmetry ◽  
Diffraction Patterns ◽  
Real Composition ◽  
The Rare Earth

Huntite-family nominally-pure and activated/co-activated LnM3(BO3)4 (Ln = La–Lu, Y; M = Al, Fe, Cr, Ga, Sc) compounds and their-based solid solutions are promising materials for lasers, nonlinear optics, spintronics, and photonics, which are characterized by multifunctional properties depending on a composition and crystal structure. The purpose of the work is to establish stability regions for the rare-earth orthoborates in crystallochemical coordinates (sizes of Ln and M ions) based on their real compositions and space symmetry depending on thermodynamic, kinetic, and crystallochemical factors. The use of diffraction structural techniques to study single crystals with a detailed analysis of diffraction patterns, refinement of crystallographic site occupancies (real composition), and determination of structure–composition correlations is the most efficient and effective option to achieve the purpose. This approach is applied and shown primarily for the rare-earth scandium borates having interesting structural features compared with the other orthoborates. Visualization of structures allowed to establish features of formation of phases with different compositions, to classify and systematize huntite-family compounds using crystallochemical concepts (structure and superstructure, ordering and disordering, isostructural and isotype compounds) and phenomena (isomorphism, morphotropism, polymorphism, polytypism). Particular attention is paid to methods and conditions for crystal growth, affecting a crystal real composition and symmetry. A critical analysis of literature data made it possible to formulate unsolved problems in materials science of rare-earth orthoborates, mainly scandium borates, which are distinguished by an ability to form internal and substitutional (Ln and Sc atoms), unlimited and limited solid solutions depending on the geometric factor.

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%.

Solid solutions in the rare-earth oxysulfide series

1976 ◽  
Vol 19 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Markku Leskelä ◽  
Lauri Niinistö
Keyword(s):  
Rare Earth ◽  
Solid Solutions ◽  
Rare Earth Oxysulfide ◽  
The Rare Earth

Flame spectra of the rare-earth elements*

1962 ◽  
Vol 18 (4) ◽  
pp. 1127-1153
Author(s):  
V FASSEL ◽  
R CURRY ◽  
R KNISELEY
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
The Rare Earth

Physico-chemical properties of the rare-earth metals, scandium, and yttrium

1963 ◽  
Vol 79 (2) ◽  
pp. 263-293 ◽  
Author(s):  
E.M. Savitskii ◽  
V.F. Terekhova ◽  
O.P. Naumkin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Chemical Properties ◽  
Physico Chemical ◽  
The Rare Earth
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