scholarly journals Grain-Size Control on the Rare Earth Elements Distribution in the Late Diagenesis of Cretaceous Shales from the Southern Apennines (Italy)

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Francesco Cavalcante ◽  
Claudia Belviso ◽  
Giuseppe Piccarreta ◽  
Saverio Fiore
Keyword(s):  
Grain Size ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Size Control ◽  
Southern Apennines ◽  
Ree Distribution ◽  
Grain Size Control ◽  
Different Grain Size ◽  
Late Diagenesis ◽  
The Rare Earth

Different grain-size fractions of samples collected from shales were investigated to determine the role of late diagenetic grade and mineralogy on the rare earth elements (REE) distribution. The samples were collected from Upper Cretaceous varicoloured shales of the Sicilide Unit near the Corleto Perticara villages, Southern Apennines (Italy). The mineralogical and chemical composition of the sample’s five fractions (>63, 32–63, 2–32, 0.1–2, and <0.1 µm) was studied. The data indicate that certain accessory minerals are more important than clay minerals in controlling the REE distribution. In particular, zircon controls the distribution of earth elements in the 0.1–2 µm fraction and is an efficient mechanism in determining the concentration and distribution of REEs in the studied shales.

scholarly journals New insights about the rare earth elements (REE) mobility in river waters

2002 ◽  
Vol 173 (2) ◽  
pp. 147-160 ◽  
Author(s):  
Samuel Deberdt ◽  
Jérôme Viers ◽  
Bernard Dupré
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
River Waters ◽  
Geological Processes ◽  
Ree Distribution ◽  
Colloidal Matter ◽  
Ree Mobility ◽  
First Time ◽  
Colloidal Fraction ◽  
The Rare Earth

Abstract While the rare earth elements (REE) have largely contributed to the understanding of some internal geological processes, their use as tracers of superficial mechanisms (i.e., weathering and elements transport) remains tricky. This results from the poor knowledge we have of the REE distribution in the different fractions of solutions. Up to recently, the studies carried out on the REE behavior in continental aquatic systems were mainly based on the “paniculate” and “solution” fractions separated by an arbitrary filtration through a 0.20 or 0.45 μm pore size membrane. Some recent work has shown, using ultrafiltration experiments, that REE are mainly contained in the colloidal fraction (i.e., 0.20 μm - 1 nm). However, studies devoted to the control of REE by the colloidal matter, have essentially focused on the organic pool (i.e., humic substances). By contrast, the mineral colloidal pool has received little attention. In order to model these processes, we have developed a combined approach that consider (1) ultrafiltration experiments performed on a series of rivers located in Africa (Cameroon) and south America (Brazil, Venezuela) and (2) speciation calculations. This quantitative approach reveals, for the first time, that more than 60 % of the total REE in the solution of river waters is controlled by the mineral colloidal pool.

scholarly journals Geochemistry of the Rare Earth Elements (REE) Distribution in Terengganu Coastal Waters: A Study Case from Redang Island Marine Sediment

2013 ◽  
Vol 03 (03) ◽  
pp. 154-159 ◽  
Author(s):  
A. Nor Antonina ◽  
N. A. M. Shazili ◽  
B. Y. Kamaruzzaman ◽  
M. C. Ong ◽  
Y. Rosnan ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Marine Sediment ◽  
Coastal Waters ◽  
Ree Distribution ◽  
Study Case ◽  
The Rare Earth

Interfacial studies in Nb3Sn superconductors

1991 ◽  
Vol 49 ◽  
pp. 590-591
Author(s):  
Ernest L. Hall ◽  
Lee E. Rumaner ◽  
Mark G. Benz
Keyword(s):  
Grain Size ◽  
Grain Boundaries ◽  
Flux Pinning ◽  
Size Control ◽  
High Magnetic Fields ◽  
Type Ii ◽  
Reaction Interface ◽  
Liquid Diffusion ◽  
Type Ii Superconductor ◽  
Grain Size Control

The intermetallic compound Nb3Sn is a type-II superconductor of interest because it has high values of critical current density Jc in high magnetic fields. One method of forming this compound involves diffusion of Sn into Nb foil containing small amounts of Zr and O. In order to maintain high values of Jc, it is important to keep the grain size in the Nb3Sn as small as possible, since the grain boundaries act as flux-pinning sites. It has been known for many years that Zr and O were essential to grain size control in this process. In previous work, we have shown that (a) the Sn is transported to the Nb3Sn/Nb interface by liquid diffusion along grain boundaries; (b) the Zr and O form small ZrO2 particles in the Nb3Sn grains; and (c) many very small Nb3Sn grains nucleate from a single Nb grain at the reaction interface. In this paper we report the results of detailed studies of the Nb3Sn/Nb3Sn, Nb3Sn/Nb, and Nb3Sn/ZrO2 interfaces.

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

scholarly journals Rationally designed mineralization for selective recovery of the rare earth elements

2017 ◽  
Vol 8 (1) ◽  
Author(s):  
Takaaki Hatanaka ◽  
Akimasa Matsugami ◽  
Takamasa Nonaka ◽  
Hideki Takagi ◽  
Fumiaki Hayashi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Selective Recovery ◽  
The Rare Earth

Grain size control of perovskite films based on β-alanine self-assembled monolayers surface treatment

2021 ◽  
pp. 138770
Author(s):  
Linlin Guan ◽  
Leiming Yu ◽  
Lijuan Wu ◽  
Shuyu Zhang ◽  
Yuting Lin ◽  
...  
Keyword(s):  
Grain Size ◽  
Surface Treatment ◽  
Size Control ◽  
Self Assembled Monolayers ◽  
Assembled Monolayers ◽  
Grain Size Control ◽  
Self Assembled

scholarly journals Grain size control in polycrystalline colloidal solids

1995 ◽  
Vol 102 (12) ◽  
pp. 5082-5087 ◽  
Author(s):  
Thomas Palberg ◽  
Wolfgang Mönch ◽  
Jürgen Schwarz ◽  
Paul Leiderer
Keyword(s):  
Grain Size ◽  
Size Control ◽  
Grain Size Control
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