Titanium isotopes and rare earth patterns in CAIs: Evidence for thermal processing and gas-dust decoupling in the protoplanetary disk

2018 ◽  
Vol 221 ◽  
pp. 275-295 ◽  
Author(s):  
Andrew M. Davis ◽  
Junjun Zhang ◽  
Nicolas D. Greber ◽  
Jingya Hu ◽  
François L.H. Tissot ◽  
...  
Keyword(s):  
Rare Earth ◽  
Thermal Processing ◽  
Protoplanetary Disk ◽  
Titanium Isotopes

Discovery of a New FUN CAI from a CV Carbonaceous Chondrite: Evidence for Multistage Thermal Processing in the Protoplanetary Disk

2008 ◽  
Vol 680 (2) ◽  
pp. L141-L144 ◽  
Author(s):  
Kristine Thrane ◽  
Kazuhide Nagashima ◽  
Alexander N. Krot ◽  
Martin Bizzarro
Keyword(s):  
Thermal Processing ◽  
Carbonaceous Chondrite ◽  
Protoplanetary Disk

Effect of thermal processing on the concentration and bioaccessibility of rare earth elements in seaweed and oyster

2017 ◽  
Vol 41 (6) ◽  
pp. e13259 ◽  
Author(s):  
Chune Liu ◽  
Hong Lin ◽  
Nasha Mi ◽  
Yue Xu ◽  
Yan Song ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Thermal Processing

The Absolute Chronology and Thermal Processing of Solids in the Solar Protoplanetary Disk

Science ◽  
2012 ◽  
Vol 338 (6107) ◽  
pp. 651-655 ◽  
Author(s):  
J. N. Connelly ◽  
M. Bizzarro ◽  
A. N. Krot ◽  
A. Nordlund ◽  
D. Wielandt ◽  
...  
Keyword(s):  
Thermal Processing ◽  
Protoplanetary Disk ◽  
The Absolute

scholarly journals Potassium isotope anomalies in meteorites inherited from the protosolar molecular cloud

2020 ◽  
Vol 6 (41) ◽  
pp. eabd0511 ◽  
Author(s):  
Y. Ku ◽  
S. B. Jacobsen
Keyword(s):  
Solar System ◽  
Isotopic Composition ◽  
Thermal Processing ◽  
Molecular Cloud ◽  
Protoplanetary Disk ◽  
The Sun ◽  
Volatile Elements ◽  
Heterogeneous Distribution ◽  
Solar System Bodies ◽  
K Depletion

Potassium (K) and other moderately volatile elements are depleted in many solar system bodies relative to CI chondrites, which closely match the composition of the Sun. These depletions and associated isotopic fractionations were initially believed to result from thermal processing in the protoplanetary disk, but so far, no correlation between the K depletion and its isotopic composition has been found. Our new high-precision K isotope data correlate with other neutron-rich nuclides (e.g., 64Ni and 54Cr) and suggest that the observed 41K variations have a nucleosynthetic origin. We propose that K isotope anomalies are inherited from an isotopically heterogeneous protosolar molecular cloud, and were preserved in bulk primitive meteorites. Thus, the heterogeneous distribution of both refractory and moderately volatile elements in chondritic meteorites points to a limited radial mixing in the protoplanetary disk.

Silicide Formation by Rapid Thermal Processing

1994 ◽  
Vol 342 ◽  
Author(s):  
L.J. Chen ◽  
W. Lur ◽  
J.F. Chen ◽  
T.L. Lee ◽  
J.M. Liang
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Thermal Processing ◽  
Metastable Phase ◽  
Rapid Thermal Processing ◽  
Silicide Formation ◽  
Vacancy Ordering ◽  
Shallow Junctions ◽  
Device Applications ◽  
Growth Formation

ABSTRACTAn overview of silicide formation by rapid thermal processing is presented. Recent progresses on device applications, phase formation, growth kinetics, thermal stability, epitaxial growth, formation of metastable phase, vacancy ordering in rare-earth silicides and Ti-based shallow junctions involving rapid thermal processing are used as examples to highlight the applications of rapid thermal processing in connection with silicide formation.

Stability of Superalloys Doped with Rare Earth Elements

2013 ◽  
Vol 586 ◽  
pp. 141-145
Author(s):  
Walenty Jasinski ◽  
Paweł Zawada
Keyword(s):  
Phase Transformation ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Thermal Processing ◽  
Microstructure Analysis ◽  
Hardness Distribution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Hardness ◽  
The Stability

The stability of the microstructure and properties of the iron superalloys of the secondgeneration IN 519 (24% Cr, 24% Ni, 1.5% Nb) modified with 0.1 and 0.2 [wt.%] rare earthelements was investigated. The alloys underwent annealing at 825 oC for 10, 100 and 1000 h. Thefollowing techniques were used to evaluate the phase transformation: X-ray diffraction on crosssectionand isolates extracted from the as-cast and annealed alloys, microstructure analysis byoptical microscopy, hardness measurements by Brinell and nanoindentation with a Berkovich tipmethod. The analysis of changes in hardness distribution due to thermal processing of superalloyswas conducted with respect to the average hardness of matrix and phase precipitates.

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

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