In-Situ Observation of Phase Separation During Growth of Cs2LiLaBr6:Ce Crystals Using Energy-Resolved Neutron Imaging

2017 ◽  
Vol 17 (12) ◽  
pp. 6372-6381 ◽  
Author(s):  
Anton S. Tremsin ◽  
Didier Perrodin ◽  
Adrian S. Losko ◽  
Sven C. Vogel ◽  
Takenao Shinohara ◽  
...  
Keyword(s):  
Phase Separation ◽  
Neutron Imaging ◽  
In Situ Observation

scholarly journals In-Situ Imaging of Molten High-Entropy Alloys Using Cold Neutrons

2019 ◽  
Vol 5 (2) ◽  
pp. 29 ◽  
Author(s):  
Nicholas Derimow ◽  
Louis Santodonato ◽  
Benjamin MacDonald ◽  
Bryan Le ◽  
Enrique Lavernia ◽  
...  
Keyword(s):  
Real Time ◽  
Liquid State ◽  
Single Phase ◽  
Neutron Imaging ◽  
Phase Changes ◽  
Vacuum Furnace ◽  
In Situ Observation ◽  
Complex Alloy ◽  
Phase Liquid

Real-time neutron imaging was utilized to produce a movie-like series of radiographs for in-situ observation of the remixing of liquid state immiscibility that occurs in equiatomic CoCrCu with the addition of Ni. A previous neutron imaging study demonstrated that liquid state immiscibility can be observed in-situ for the equiatomic CoCrCu alloy. In this follow-up study, equiatomic buttons of CoCrCu were placed alongside small Ni buttons inside an alumina crucible in a high-temperature vacuum furnace. The mass of the Ni buttons was specifically selected such that when melted in the same crucible as the CoCrCu buttons, the overall composition would become equiatomic CoCrCuNi. Neutron imaging was simultaneously carried out to capture 10 radiographs in 20 °C steps from 1000 °C to 1500 °C and back down to 1000 °C. This, in turn, produced a movie-like series of radiographs that allow for the observation of the buttons melting, the transition from immiscible to miscible as Ni is alloyed into the CoCrCu system, and solidification. This novel imaging process showed the phase-separated liquids remixing into a single-phase liquid when Ni dissolves into the melt, which makes this technique crucial for understanding the liquid state behavior of these complex alloy systems. As metals are not transparent to X-ray imaging techniques at this scale, neutron imaging of melting and solidification allows for the observation of liquid state phase changes in real time. Thermodynamic calculations of the isopleth for CoCrCuNix were carried out to compare the observed results to the predictions resulting from the current Thermo-Calc TCHEA3 thermodynamic database. The calculations show a very good agreement with the experimental results, as the calculations indicate that the CoCrCuNix alloy solidifies from a single-phase liquid when x ≥ 0.275, which is close to the nominal concentration of the CoCrCuNi alloy (x = 0.25). The neutron imaging shows that the solidification of CoCrCuNi results from a single-phase liquid. This is evident as no changes in the neutron attenuation were observed during the solidification of the CoCrCuNi alloy.

In situ observation of phase separation processes in gelling alkoxy-derived silica system by light scattering method

1994 ◽  
Vol 3 (3) ◽  
pp. 169-188 ◽  
Author(s):  
Hironori Kaji ◽  
Kazuki Nakanishi ◽  
Naohiro Soga ◽  
Tadashi Inoue ◽  
Norio Nemoto
Keyword(s):  
Phase Separation ◽  
Light Scattering ◽  
In Situ Observation ◽  
Scattering Method ◽  
Separation Processes

scholarly journals In Situ Observation of Liquid-Liquid Phase Separation of Glass under Microgravity

2005 ◽  
Vol 113 (1321) ◽  
pp. 593-596
Author(s):  
Yuji MINAMI ◽  
Akio MAKISHIMA ◽  
Akira TANJI ◽  
Tomoya KONISHI ◽  
Satoru INOUE
Keyword(s):  
Phase Separation ◽  
Liquid Phase ◽  
Liquid Phase Separation ◽  
In Situ Observation ◽  
Liquid Liquid Phase Separation

In Situ Observation of Phase Separation of a Barium Borate Melt in a Stable Immiscibility Region under Microgravity

2005 ◽  
Vol 80 (9) ◽  
pp. 2413-2417 ◽  
Author(s):  
Satoru Inoue ◽  
Akio Makishima ◽  
Hiroyuki Inoue ◽  
Kohei Soga ◽  
Tomoya Konishi ◽  
...  
Keyword(s):  
Phase Separation ◽  
In Situ Observation ◽  
Barium Borate ◽  
Immiscibility Region

scholarly journals In Situ Observation of Phase Separation in High-Temperature Superconductor La2-xSrxCuO4

2017 ◽  
Vol 23 (S1) ◽  
pp. 1680-1681
Author(s):  
Jong Seok Jeong ◽  
Wangzhou Wu ◽  
Guichuan Yu ◽  
Martin Greven ◽  
K. Andre Mkhoyan
Keyword(s):  
Phase Separation ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
In Situ Observation

In Situ Observation of Catalyzed Gasification of Graphite by Nickel

1981 ◽  
Vol 39 ◽  
pp. 76-77
Author(s):  
R. T. K. Baker ◽  
R. D. Sherwood
Keyword(s):  
Objective Lens ◽  
In Situ Observation ◽  
Gas Flows ◽  
Catalytic Gasification ◽  
Television Camera ◽  
Viewing Screen ◽  
Fuels And Chemicals ◽  
Gasification Of Carbon ◽  
Transmission Microscope

The catalytic gasification of carbon at high temperature by microscopic size metal particles is of fundamental importance to removal of coke deposits and conversion of refractory hydrocarbons into fuels and chemicals. The reaction of metal/carbon/gas systems can be observed by controlled atmosphere electron microscopy (CAEM) in an 100 KV conventional transmission microscope. In the JEOL gas reaction stage model AGl (Fig. 1) the specimen is positioned over a hole, 200μm diameter, in a platinum heater strip, and is interposed between two apertures, 75μm diameter. The control gas flows across the specimen and exits through these apertures into the specimen chamber. The gas is further confined by two apertures, one in the condenser and one in the objective lens pole pieces, and removed by an auxiliary vacuum pump. The reaction zone is <1 mm thick and is maintained at gas pressure up to 400 Torr and temperature up to 1300<C as measured by a Pt-Pt/Rh 13% thermocouple. Reaction events are observed and recorded on videotape by using a Philips phosphor-television camera located below a hole in the center of the viewing screen. The overall resolution is greater than 2.5 nm.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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