Synthesis of Europium Sulfides by CS2 Sulfurization and Heat Treatment

MRS Advances ◽  
2016 ◽  
Vol 1 (60) ◽  
pp. 3983-3988 ◽  
Author(s):  
Liang Li ◽  
Shinji Hirai ◽  
Eiji Nakamura ◽  
Haibin Yuan
Keyword(s):  
Heat Treatment ◽  
High Purity ◽  
Single Phase ◽  
Inert Atmosphere ◽  
Sulfurization Temperature ◽  
Oxygen Formation ◽  
Sulfur Atmosphere ◽  
Impurity Oxygen ◽  
Sulfurization Time

ABSTRACTThe formation of europium sulfides (Eu3S4 and EuS) via CS2 gas sulfurization of Eu2O3 powder was investigated. Single-phase Eu3S4 was obtained via CS2 gas sulfurization of Eu2O3 at 773 K for periods longer than 0.5 hr and EuS was generated by sulfurization at 1073 K for 8 hr. The higher sulfurization temperature and shorter sulfurization time accelerated the formation of high purity EuS. Synthetic pure Eu3S4 was treated under vacuum, rich-sulfur atmosphere and inert atmosphere, respectively. EuS was obtained when heat treatment was performed at 873 K under vacuum, at 973 K under CS2/Ar atmosphere, and at 1073 K under Ar atmosphere. Heat treatment of Eu3S4 generated a small amount of Eu2O2S due to impurity oxygen. Formation of Eu2O2S could be inhibited by heat treatment under CS2/Ar atmosphere.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

ALCOA 1XXX SERIES

Alloy Digest ◽  
2005 ◽  
Vol 54 (7) ◽  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Shear Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
High Purity ◽  
High Conductivity ◽  
Good Corrosion Resistance

Abstract Aluminum 1xxx series alloys are nonhardenable by heat treatment. They have high purity, high conductivity, and good corrosion resistance and are easily formed. This datasheet provides information on composition, physical properties, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, machining, joining, and surface treatment. Filing Code: AL-395. Producer or source: Alcoa Engineered Products.

Measuring Water Vapour in High-Purity Gas

1969 ◽  
Vol 2 (6) ◽  
pp. 236-238
Author(s):  
G. W. Lord
Keyword(s):  
Heat Treatment ◽  
Water Vapour ◽  
High Purity ◽  
Semiconductor Materials ◽  
Direct Reading ◽  
Magnetic Alloys ◽  
Water Vapour Content

The desired properties of magnetic alloys, semiconductor materials and similar products are usually developed by heat treatment in a stream off pure dry gas … the presence of even a few parts per million of water vapour in this gas can cause unwanted changes in such properties … to monitor the water-vapour content, a direct-reading dewpoint meter has been developed which is claimed to be more rapid and sensitive than similar meters

Effect of Ferrite Volume Fraction on Mechanical Properties of X80 Pipeline Steel

2014 ◽  
Vol 989-994 ◽  
pp. 212-215
Author(s):  
J. Liu ◽  
G. Zhu ◽  
W. Mao
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Work Hardening ◽  
Single Phase ◽  
Volume Fraction ◽  
Pipeline Steel ◽  
X80 Pipeline Steel ◽  
Hardening Behavior ◽  
Two Phases ◽  
Better Than

The effect of volume fraction of ferrite on the mechanical properties including strength, plasticity and wok hardening was systematically investigated in X80 pipeline steel in order to improve the plasticity. The microstructures with different volume fraction of ferrite and bainite were obtained by heat-treatment processing and the mechanical properties were tested. The work hardening behavior was analyzed by C-J method. The results show that the small amount of ferrite could effectively improve the plasticity. The work hardening ability and the ratio of yield/tensile strength with two phases of ferrite/bainite would be obviously better than that with single phase of bainite. The improvement of plasticity could be attributed to the ferrite in which more plastic deformation was afforded.

Sol-gel processing of cordierite: Effect of seeding and optimization of heat treatment

1990 ◽  
Vol 5 (5) ◽  
pp. 1095-1103 ◽  
Author(s):  
Ann M. Kazakos ◽  
Sridhar Komarneni ◽  
Rustum Roy
Keyword(s):  
Heat Treatment ◽  
Single Phase ◽  
Excess Free Energy ◽  
Sol Gel ◽  
Nucleating Agents ◽  
Optimum Conditions ◽  
Nanosized Powders ◽  
Nanocomposite Gels ◽  
Powder Compacts ◽  
Gel Processing

Three series of cordierite powders were prepared by the sol-gel route: a single phase (monophasic) gel prepared from alkoxides, a nominally triphasic nanocomposite gel made with two nanosized powders and one solution phase, and a truly compositionally triphasic nanocomposite gel prepared from three nanosized powders. Crystalline α-cordierite seeds were also incorporated with the gels and their effectiveness as nucleating agents was investigated and found to lower the crystallization temperature of α-cordierite by 125–150°C. The densification behavior of powder compacts was examined and alterations made to the heat treatment until optimum conditions were found. The truly triphasic compact sintered at 1300°C for 2 h resulted in 100% of theoretical density whereas the nominally triphasic and monophasis pellets densified to 96% and 80%, respectively. The enhanced densification achieved with powder compacct prepared for triphasic nanocomposite gels is due to part to the excess free energy of the three components.

Magnetic Properties of Rapidly Quenched Soft Magnetic Co-Based Alloy Subjected to Heat Treatment in a Sulfur Atmosphere

2021 ◽  
Vol 122 (1) ◽  
pp. 1-5
Author(s):  
A. A. Feshchenko ◽  
N. A. Kulesh ◽  
E. A. Mikhalitsina ◽  
D. S. Neznakhin ◽  
N. V. Selezneva ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Magnetic Properties ◽  
Soft Magnetic ◽  
Sulfur Atmosphere

scholarly journals Surface segregation of lead in high-purity aluminum during heat treatment.

2002 ◽  
Vol 52 (9) ◽  
pp. 410-416 ◽  
Author(s):  
Harushige TSUBAKINO ◽  
Atsushi NOGAMI ◽  
Mititaka TERASAWA ◽  
Toru MITAMURA ◽  
Tomoaki YAMANOI ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Purity ◽  
Surface Segregation ◽  
High Purity Aluminum
Sign in / Sign up

Export Citation Format

Share Document