scholarly journals High-Entropy Pyrochlore A2B2O7 with Both Heavy and Light Rare-Earth Elements at the A Site

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 129
Author(s):  
Zhen Teng ◽  
Yongqiang Tan ◽  
Haibin Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Pyrochlore Structure ◽  
Homogeneous Distribution ◽  
Light Rare Earth ◽  
Electron Microscopic ◽  
High Entropy ◽  
Typical Morphology ◽  
A Site ◽  
Light Rare Earth Elements

A novel class of high-entropy pyrochlore ceramics (HEPCs) with multiple heavy and light rare-earth elements at the A site were successfully synthesized via solid-state reaction. Both the XRD patterns and Raman spectroscopy demonstrated the single pyrochlore structure feature of seven kinds of HEPCs. Electron microscopic images revealed the typical morphology and the homogeneous distribution of all rare-earth elements. It can be concluded that the significance of configuration entropy in the HEPC system has promoted the tervalent lanthanide nuclides to form a single pyrochlore structure. This work is expected to provide guidance for the further design of high-entropy pyrochlore/fluorite ceramics.

Depletion of light rare-earth elements in felsic magmas

Geology ◽  
1982 ◽  
Vol 10 (3) ◽  
pp. 129 ◽  
Author(s):  
Calvin F. Miller ◽  
David W. Mittlefehldt
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

Recycling and substitution of light rare earth elements, cerium, lanthanum, neodymium, and praseodymium from end-of-life applications - A review

2019 ◽  
Vol 236 ◽  
pp. 117573 ◽  
Author(s):  
Linda Omodara ◽  
Satu Pitkäaho ◽  
Esa-Matti Turpeinen ◽  
Paula Saavalainen ◽  
Kati Oravisjärvi ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
End Of Life ◽  
Light Rare Earth ◽  
Light Rare Earth Elements

Significance of the metasomatized lithospheric mantle in the formation of early basalts and Cu – platinum group element sulfide mineralization in the Coldwell Complex, Midcontinent Rift, Canada

2019 ◽  
Vol 56 (7) ◽  
pp. 693-714 ◽  
Author(s):  
David J. Good ◽  
Peter C. Lightfoot
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Trace Element ◽  
Lithospheric Mantle ◽  
Group Element ◽  
Light Rare Earth ◽  
Midcontinent Rift ◽  
Northern Margin ◽  
Lithospheric Mantle Source ◽  
Light Rare Earth Elements

A diverse suite of tholeiitic to alkaline basalt and gabbroic intrusions located in the Coldwell Complex on the northern margin of the Midcontinent Rift exhibit unusual trace element signatures that show enriched large ion lithophile elements and light rare earth elements with negative Nb and Zr anomalies. These features are not typical of magmas derived by partial melting within or above a rising mantle plume, as might be expected in an early Midcontinent Rift magmatic event. In this paper, we provide a detailed geochemical study of a 500 m thick sequence of metabasalt that represents the earliest stage of magmatism in the Coldwell Complex. We show that contamination or crystallization processes or subsequent metasomatism cannot explain the trace element variations. Instead, we propose partial melting in a metasomatized Subcontinental Lithospheric Mantle source to explain the decoupled behavior of large ion lithophile elements from light rare earth elements and heavy rare earth elements and rare earth elements from high field strength elements and the enriched Nd isotope signature of metabasalt. Similar features occur in unit 5b of the Mamainse Point Volcanic Group located at the northern margin of the Rift. An objective of this paper is to relate Two Duck Lake gabbro, host rock for low-sulfur, high precious metal sulfide mineralization at the Marathon deposit, to the metabasalt sequence. The excellent match of trace element abundances in Two Duck Lake gabbro to metabasalt unit 3 confirms an early Coldwell Complex age for metabasalt and a Subcontinental Lithospheric Mantle source for Cu – platinum group element mineralized gabbros.

scholarly journals Geochemical Characteristics of Dolomitic Phosphorite Containing Rare Earth Elements and Its Weathered Ore

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 416 ◽  
Author(s):  
Shuai Li ◽  
Jie Zhang ◽  
Huaifa Wang ◽  
Caili Wang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Test Method ◽  
Isomorphic Substitution ◽  
Leaching Test ◽  
Light Rare Earth ◽  
Marine Sedimentation ◽  
Mineralogical Characteristics ◽  
Development And Utilization ◽  
Light Rare Earth Elements

In order to provide a good theoretical guidance for the development and utilization of weathered phosphorite resources, we investigated the geochemical and mineralogical characteristics of primary and weathered phosphorites. The analysis of trace elements showed that the primary ore has hydrothermal sedimentation effect in the later stage, the weathered ore has obvious residual enrichment and the phosphate ore belongs to clastic lithologic phosphate rock. In addition, through leaching test method, it was shown that rare earth elements are present in fluorapatite in the form of isomorphic substitution, and the proportion of rare earth elements adsorbed on clay and other minerals was likely to be between 2% and 3%. The light rare earth elements are relatively enriched in both primary and weathered phosphorite, and Ce and Eu have obvious negative anomalies. The primary phosphorite is a dolomitic phosphorite containing rare earth elements, which are naturally enriched by weathering, and its weathered ore has obvious residual enrichment, while the deposit was characterized by normal marine sedimentation and hydrothermal action.

Adsorption/desorption Behaviors of Light Rare Earth Elements (Ce and Nd) using Lewatit VP OC 1026

2015 ◽  
Vol 52 (4) ◽  
pp. 353-363
Author(s):  
Won Geun Lee ◽  
Joung Woon Kim ◽  
Sungeun Lee ◽  
Insung Hwang ◽  
Hong Myeong Jeon ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Light Rare Earth ◽  
Adsorption Desorption ◽  
Light Rare Earth Elements
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