Correlation between terbium and the other rare earth element contents in fern leaves

1998 ◽  
Vol 236 (1-2) ◽  
pp. 35-38 ◽  
Author(s):  
J. Takada ◽  
T. Sumino ◽  
Y. Tanaka ◽  
K. Nishimura ◽  
M. Akaboshi
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
The Other ◽  
Element Contents ◽  
Fern Leaves

scholarly journals The long-term variations of rare earth element contents in Tamagawa hot spring waters, Akita Prefecture, Japan.

2002 ◽  
Vol 63 (2) ◽  
pp. 135-145 ◽  
Author(s):  
Tetsuya SANADA ◽  
Nobuki TAKAMATSU ◽  
Yuzo YOSHIIKE ◽  
Masayuki IMAHASHI ◽  
Hideo HIGUCHI
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Hot Spring ◽  
Akita Prefecture ◽  
Element Contents ◽  
Long Term Variations

Micro-Structural Studies of Leached SON-68-Type Glasses

2001 ◽  
Author(s):  
N. Ollier ◽  
G. Panczer ◽  
B. Champagnon ◽  
P. Jollivet
Keyword(s):  
Rare Earth ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Rare Earth Element ◽  
Earth Element ◽  
The Other ◽  
Structural Studies ◽  
Microscopic Features ◽  
Precipitated Phases ◽  
Scanning Electron

Abstract Two types of borosilicate leached SON68-type glasses were studied, one doped with uranium and the other with rare-earth element (Nd, Eu). Photoluminescence and cathodoluminescence properties of U doped samples have been correlated to microscopic features of the corroded glass. Nuclear analysis, Electronic Microprobe and Scanning Electron Microscope investigations revealed the heterogeneous composition of the gels with differentiated phases. Enriched U phases (crystallised or not) and phosphorus precipitated phases in rare earth gel have been detected.

scholarly journals The Occurrence States of Rare Earth Elements Bearing Phosphorite Ores and Rare Earth Enrichment Through the Selective Reverse Flotation

Minerals ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 698
Author(s):  
Wenxiang Chen ◽  
Feng Zhou ◽  
Hongquan Wang ◽  
Sen Zhou ◽  
Chunjie Yan
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Rare Earth Element ◽  
Earth Element ◽  
Ion Beam ◽  
Western China ◽  
Reverse Flotation ◽  
Flotation Process ◽  
Element Bearing ◽  
Element Contents

The reserve of rare-earth element-bearing phosphorite ores in Guizhou province in western China is huge. Increased demand for the different products manufactured from rare-earth elements has resulted in an extreme need for reasonable and comprehensive extraction of rare-earth elements. An improved understanding of rare-earth element occurrence states in single minerals of ores is important for their further processing. In this paper, rare-earth element contents were analyzed by inductively coupled plasma (ICP), and the occurrence states in single minerals were further investigated through SEM-EDS and focused ion beam-scanning electron microscope (FIB-SEM) methods. The results indicate that rare-earth element contents of apatite are far more than that of dolomite. No independent mineral of rare-earth elements exists for the studied sample. Rare-earth elements are present in the form of ions in the lattices of apatite. Based on the analysis of occurrence states and properties in single minerals, the distribution of rare-earth elements in the flotation process was investigated by reverse flotation technology. It shows that rare-earth elements are mainly concentrated in apatite concentrate. Under the optimized conditions, the P2O5 grade increases from 11.36% in the raw ore to 26.04% in the concentrate, and the recovery is 81.92%, while the total rare-earth oxide grade increases from 0.09% to 0.21% with the recovery of 80.01%, which is similar to P2O5 recovery. This study presents the feasibility of extracting rare-earth elements from rare-earth element-bearing phosphorite ores through the flotation of apatite.

Influence of the temperature of CO2-rich springs on their aluminium and rare-earth element contents

1988 ◽  
Vol 68 (1-2) ◽  
pp. 57-67 ◽  
Author(s):  
Bernard Sanjuan ◽  
Annie Michard ◽  
Gil Michard
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Element Contents

Rare earth element contents of Jurassic fish and reptile teeth and their potential relation to seawater composition (Anglo-Paris Basin, France and England)

2002 ◽  
Vol 186 (1-2) ◽  
pp. 1-16 ◽  
Author(s):  
Stéphanie Picard ◽  
Christophe Lécuyer ◽  
Jean-Alix Barrat ◽  
Jean-Pierre Garcia ◽  
Gilles Dromart ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Earth Element ◽  
Paris Basin ◽  
Element Contents

scholarly journals Nioboaeschynite-(Ce), Ce(NbTi)O6

2012 ◽  
Vol 68 (8) ◽  
pp. i64-i65
Author(s):  
Shaunna M. Morrison ◽  
Robert T. Downs ◽  
Kenneth J. Domanik ◽  
Hexiong Yang ◽  
Donald Doell
Keyword(s):  
Rare Earth ◽  
Structural Feature ◽  
General Formula ◽  
Rare Earth Element ◽  
Earth Element ◽  
Three Dimensional ◽  
The Other ◽  
Crystal Chemical ◽  
Natural Sample ◽  
Bond Lengths

Nioboaeschynite-(Ce), ideally Ce(NbTi)O6[cerium(III) niobium(V) titanium(IV) hexaoxide; refined formula of the natural sample is Ca0.25Ce0.79(Nb1.14Ti0.86)O6], belongs to the aeschynite mineral group which is characterized by the general formulaAB2(O,OH)6, where eight-coordinatedAis a rare earth element, Ca, Th or Fe, and six-coordinatedBis Ti, Nb, Ta or W. The general structural feature of nioboaeschynite-(Ce) resembles that of the other members of the aeschynite group. It is characterized by edge-sharing dimers of [(Nb,Ti)O6] octahedra which share corners to form a three-dimensional framework, with theAsites located in channels parallel to thebaxis. The averageA—O andB—O bond lengths in nioboaeschynite-(Ce) are 2.471 and 1.993 Å, respectively. Moreover, another eight-coordinated site, designated as theCsite, is also located in the channels and is partially occupied byA-type cations. Additionally, the refinement revealed a splitting of theAsite, with Ca displaced slightly from Ce (0.266 Å apart), presumably resulting from the crystal-chemical differences between the Ce3+and Ca2+cations.

U–Pb ages and Sm–Nd signature of two subsurface granites from the Fort Simpson magnetic high, northwest Canada

1991 ◽  
Vol 28 (7) ◽  
pp. 1003-1008 ◽  
Author(s):  
M. E. Villeneuve ◽  
R. J. Thériault ◽  
G. M. Ross
Keyword(s):  
Rare Earth ◽  
Isotopic Composition ◽  
Rare Earth Element ◽  
Earth Element ◽  
The Other ◽  
Zircon Geochronology ◽  
Light Rare Earth ◽  
Great Bear Magmatic Zone ◽  
Drill Holes ◽  
Nd Isotopic Composition

Two undeformed biotite granites recovered from exploratory hydrocarbon drill holes that penetrated basement in the Fort Simpson magnetic high were analyzed for U–Pb zircon geochronology and Sm–Nd isotopic composition. Both samples give crystallization ages of 1845 Ma, with errors of less than 5 Ma. This age overlaps with the waning stages of magmatism in the Great Bear magmatic zone of Wopmay Orogen, 200 km to the east. One sample has an initial εNd of +1.3 and a TDM of 2.14 Ga, whereas the other yielded an initial εNd of −2.1 and a TDM of 2.45 Ga. The latter sample indicates that Early Proterozoic light rare-earth element enriched lithosphere with a crustal history dating back to at least 2.45 Ga is present in the subsurface west of Wopmay Orogen.

Rare earth element contents in lower and higher flora from the Bulgarian region of the black sea

1994 ◽  
Vol 46 (4) ◽  
pp. 229-238 ◽  
Author(s):  
T. Denchev ◽  
L. Petrov ◽  
O. GARCIA Martinez ◽  
S. Dimitrova ◽  
D. Vodenicharov
Keyword(s):  
Rare Earth ◽  
Rare Earth Element ◽  
Black Sea ◽  
Earth Element ◽  
The Black Sea ◽  
Element Contents
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