A new ultrahigh vacuum single crystal sample transfer system with direct temperature control and measurement

1991 ◽  
Vol 9 (2) ◽  
pp. 345-349 ◽  
Author(s):  
R. Raval ◽  
M. A. Harrison ◽  
D. A. King ◽  
G. Caine
Keyword(s):  
Single Crystal ◽  
Temperature Control ◽  
Ultrahigh Vacuum ◽  
Single Crystal Sample ◽  
Transfer System ◽  
Crystal Sample ◽  
Sample Transfer

scholarly journals Development of a single crystal sample holder for interfacing ultrahigh vacuum and electrochemical experimentation

2021 ◽  
Vol 92 (7) ◽  
pp. 074104
Author(s):  
Jared P. Bruce ◽  
Khanh-Ly C. Nguyen ◽  
Fabian Scholten ◽  
Rosa M. Arán-Ais ◽  
Juan J. Navarro ◽  
...  
Keyword(s):  
Single Crystal ◽  
Ultrahigh Vacuum ◽  
Single Crystal Sample ◽  
Sample Holder ◽  
Crystal Sample

scholarly journals Stability and equation of state of face-centered cubic and hexagonal close packed phases of argon under pressure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Agnès Dewaele ◽  
Angelika D. Rosa ◽  
Nicolas Guignot ◽  
Denis Andrault ◽  
João Elias F. S. Rodrigues ◽  
...  
Keyword(s):  
Equation Of State ◽  
Single Crystal ◽  
Single Crystal Sample ◽  
Moderate Pressure ◽  
Face Centered Cubic ◽  
Experimental Conditions ◽  
Crystal Sample ◽  
Hexagonal Close Packed ◽  
Face Centered ◽  
Fcc Phase

AbstractThe compression of argon is measured between 10 K and 296 K up to 20 GPa and and up to 114 GPa at 296 K in diamond anvil cells. Three samples conditioning are used: (1) single crystal sample directly compressed between the anvils, (2) powder sample directly compressed between the anvils, (3) single crystal sample compressed in a pressure medium. A partial transformation of the face-centered cubic (fcc) phase to a hexagonal close-packed (hcp) structure is observed above 4.2–13 GPa. Hcp phase forms through stacking faults in fcc-Ar and its amount depends on pressurizing conditions and starting fcc-Ar microstructure. The quasi-hydrostatic equation of state of the fcc phase is well described by a quasi-harmonic Mie–Grüneisen–Debye formalism, with the following 0 K parameters for Rydberg-Vinet equation: $$V_0$$ V 0 = 38.0 Å$$^3$$ 3 /at, $$K_0$$ K 0 = 2.65 GPa, $$K'_0$$ K 0 ′ = 7.423. Under the current experimental conditions, non-hydrostaticity affects measured P–V points mostly at moderate pressure ($$\le$$ ≤ 20 GPa).

Extending the temperature sensing range using Eu3+ luminescence up to 865 K in a single crystal of EuPO4

2019 ◽  
Vol 21 (29) ◽  
pp. 16329-16336 ◽  
Author(s):  
Suchinder K. Sharma ◽  
Thomas Köhler ◽  
Jan Beyer ◽  
Margret Fuchs ◽  
Richard Gloaguen ◽  
...  
Keyword(s):  
Single Crystal ◽  
Temperature Sensing ◽  
Single Crystal Sample ◽  
Coupling Scheme ◽  
Excitation Wavelength ◽  
Crystal Sample ◽  
Sensing Range

Extending the temperature sensing range up to 865 K using an appropriate choice of excitation wavelength and coupling scheme in a single crystal sample of EuPO4.

Stability of High-Spin State of Iron in β-NaFeO2

2020 ◽  
Vol 855 ◽  
pp. 177-182
Author(s):  
Mochammad Yan Pandu Akbar ◽  
Rieko Ishii ◽  
Agustinus Agung Nugroho
Keyword(s):  
Single Crystal ◽  
High Spin ◽  
Spin State ◽  
High Spin State ◽  
Polycrystalline Sample ◽  
Single Crystal Sample ◽  
Structural Refinement ◽  
Crystal Sample ◽  
The Stability ◽  
Crystal Volume

We investigated the stability of the high-spin state of the iron β-NaFeO2 based on the structural refinement. The oxidation of the Fe2+ ion in the as-synthesized sample is evidenced by its green color. Due to its sensitivity in air and CO2, this compound will decompose into a reddish Fe3+ state. The smaller crystal volume of the decomposed compound is mainly related to the shorter ionic radius of the high-spin state Fe3+ and this result will be compared to the single crystal sample. In contrast to the polycrystalline sample, the decomposition single crystal sample only taking place on the surface of the as-grown crystal.

Origin of Paramagnetic Defect in Single Crystal and Ceramic B4C

1987 ◽  
Vol 97 ◽  
Author(s):  
E. L. Venturini ◽  
D. Emin ◽  
T. L. Aselage
Keyword(s):  
Single Crystal ◽  
Angular Dependence ◽  
Esr Spectra ◽  
Single Crystal Sample ◽  
Paramagnetic Defect ◽  
Crystal Sample ◽  
Spin Resonance ◽  
Integrated Intensity ◽  
Increasing Temperature ◽  
Positively Charged

ABSTRACTWe compare electron spin resonance (ESR) spectra of B4C samples made by three methods. The samples are 1) two ceramics made by hot-pressing boron and carbon powders, 2) a polycrystal made by carbothermic reduction, and 3) a single crystal grown from a palladium metal melt. All samples show remarkably similar spectra between 2 and 100 K. In particular, all samples show a single Lorentzian absorption, a linewidth that decreases with increasing temperature, and an inverse temperature dependence of the integrated intensity. The integrated intensity of the paramagnetic spin signal corresponds to a density of 2×1019/cm2 localized spins. Having a single crystal sample enables us to meaningfully measure the angular dependence of the ESR linewidth. This angular dependence is consistent with the paramagetic centers being unpaired electrons centered on the central carbon atoms of positively charged C-C-C intericosahedral chains. These chains appear to replace 0.5 % of the positively charged C-B-C intericosahedral chains which occur in B4C.

A Fundamental Model of Aluminum Single Crystal Behavior with Physical Description of Kinematic Work Hardening

2007 ◽  
Vol 550 ◽  
pp. 577-582 ◽  
Author(s):  
Afaf Saai ◽  
Laurent Tabourot ◽  
Christophe Déprés ◽  
Herve Louche
Keyword(s):  
Single Crystal ◽  
Work Hardening ◽  
Single Crystal Sample ◽  
Large Strains ◽  
Shear Stresses ◽  
State Variables ◽  
Aluminum Single Crystal ◽  
Crystal Sample ◽  
Hardening Mechanism ◽  
Fundamental Model

In this paper, we present a fundamental model of FCC single crystal behaviour at room temperature: this model includes kinematic work hardening derived from the elementary description of the collective dislocations density evolution during cyclic loading. This kinematic work hardening is then coupled with the isotropic work hardening mechanism. Using this original model, a simulation of a tensile test on a single crystal sample is carried out in the case of an initial crystal orientation that promotes single glide even at rather large strains. The evolution of resolved shear stresses on the primary and secondary slip systems are interpreted by means of the interaction between the evolution of isotropic and kinematic work hardening variables. The evolution of the model state-variables including applied resolved shear strain, dislocation densities, and critical shear stresses are represented as functions of the evolution of crystalline orientation during plastic deformation.

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