Directed synthesis and study of their spectroscopic behavior in solution of rare-earth phthalocyaninates substituted by benzyloxy- and methylphenylethylphenoxy-groups

2022 ◽  
Author(s):  
A. A. Botnar ◽  
A. N. Bychkova ◽  
N. P. Domareva ◽  
T. V. Tikhomirova ◽  
A. S. Vashurin
Keyword(s):  
Rare Earth ◽  
Directed Synthesis ◽  
Spectroscopic Behavior

Rare Earth pcu Metal–Organic Framework Platform Based on RE4(μ3-OH)4(COO)62+ Clusters: Rational Design, Directed Synthesis, and Deliberate Tuning of Excitation Wavelengths

2017 ◽  
Vol 139 (27) ◽  
pp. 9333-9340 ◽  
Author(s):  
Tian-Yi Luo ◽  
Chong Liu ◽  
Svetlana V. Eliseeva ◽  
Patrick F. Muldoon ◽  
Stéphane Petoud ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rational Design ◽  
Metal Organic Framework ◽  
Directed Synthesis ◽  
Metal Organic ◽  
Organic Framework

Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) - Directed Synthesis, Crystal and Electronic Structures, and Bonding Features

2018 ◽  
Vol 644 (24) ◽  
pp. 1886-1896 ◽  
Author(s):  
Hagen Poddig ◽  
Tom Donath ◽  
Paul Gebauer ◽  
Kati Finzel ◽  
Miroslav Kohout ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Electronic Structures ◽  
Earth Metal ◽  
Directed Synthesis

Photomagnetic behavior and infrared spectroscopy of rare-earth doped La0.7Sr0.3MnO3

MRS Advances ◽  
2019 ◽  
Vol 4 (09) ◽  
pp. 559-565
Author(s):  
Ricardo Martínez ◽  
Hannu Huhtinen ◽  
Wojciech Jadwisienczak ◽  
Ratnakar Palai
Keyword(s):  
Rare Earth ◽  
Uv Light ◽  
Structural Phase ◽  
Optical Excitation ◽  
X Ray Diffraction ◽  
Structural Phase Transformation ◽  
Co Doping ◽  
Ir Spectroscopic ◽  
Rare Earth Doped ◽  
Spectroscopic Behavior

AbstractWe report on photo-induced magnetic effect and infrared (IR) spectroscopic behavior of colossal magnetorestive manganite La0.7Sr0.3MnO3 (LSMO) with rare earth co-doping (Er3+ and Yb3) at room temperature. X-ray diffraction shows that a structural phase transformation from rhombohedral to hexagonal with increasing Er and Yb concentrations. Photo-induced magnetoresistance showed that Er3+ and Yb+3 ions have significant influence on the magnetic and electrical ordering of LSMO under the influence of UV light. The optical excitation also shows an enhancement in the magnetotransport properties of LSMO.

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.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

Microstructural characterization of a cast RENi5-based alloy

1993 ◽  
Vol 51 ◽  
pp. 1176-1177
Author(s):  
G. M. Micha ◽  
L. Zhang
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Microstructural Characterization ◽  
Binary Compound ◽  
Nickel Metal ◽  
Cast Material ◽  
Nickel Metal Hydride ◽  
Transmission Electron ◽  
Cast Condition

RENi5 (RE: rare earth) based alloys have been extensively evaluated for use as an electrode material for nickel-metal hydride batteries. A variety of alloys have been developed from the prototype intermetallic compound LaNi5. The use of mischmetal as a source of rare earth combined with transition metal and Al substitutions for Ni has caused the evolution of the alloy from a binary compound to one containing eight or more elements. This study evaluated the microstructural features of a complex commercial RENi5 based alloy using scanning and transmission electron microscopy.The alloy was evaluated in the as-cast condition. Its chemistry in at. pct. determined by bulk techniques was 12.1 La, 3.2 Ce, 1.5 Pr, 4.9 Nd, 50.2 Ni, 10.4 Co, 5.3 Mn and 2.0 Al. The as-cast material was of low strength, very brittle and contained a multitude of internal cracks. TEM foils could only be prepared by first embedding pieces of the alloy in epoxy.

Rare Earth Production

1952 ◽  
Vol 44 (3) ◽  
pp. 442-442
Author(s):  
Frank Spedding ◽  
Harley Wilhelm ◽  
Wayne Keller et al
Keyword(s):  
Rare Earth
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