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125. Preparation of Te-based compound target for amorphous semiconductor thin film

Author

PAN Xing-hao, CHU Mao-you, WANG Xing-ming, LIU Yu-yang, BAI Xue, GUI Tao, and ZHANG Chao

Subjects
chalcogenide amorphous, powder, target, teasgesi, densification, Mining engineering. Metallurgy, TN1-997, Environmental engineering, TA170-171
Abstract

When a certain threshold switching voltage is applied to a semiconductor of Te-based compound in a high-impedance amorphous state, the semiconductor transits into a low-resistance state, and the resistance difference is more than five orders of magnitude. Therefore, TeAsGeSi material can be prepared as a threshold switch and used in the form of a thin film in a phase-change memory and other elements to improve the performance of such elements. There are few studies on the preparation of such targets, and the key technologies have been monopolized. In this study, the powder difference was taken as the basis to study the target material preparation process of this material in order to prepare a target with high density and uniform composition. Two kinds of TeAsGeSi alloy powders were prepared by vacuum melting under different cooling conditions: quenching and slow cooling. The X-ray diffraction (XRD) analysis shows that the powder prepared by rapid cooling is amorphous, while the powder prepared by slow cooling process is crystalline, and the main crystal phase is As 2GeTe4. The differential scanning calorimetry and thermogravimetry (DSC-TG) curves of the two powders shows that the powders begin to lose weight quickly at 400 ℃, and the slowly cooled powder melts at 350 ℃. As a result, the sintering temperature must not exceed 340 ℃. The TeAsGeSi alloy target was prepared by vacuum hot pressing. The two powders were incubated at 340 ℃ for 2 h and 20 MPa to prepare two targets. The target material prepared by the slowly cooled powder has a high density of 5. 46 g·cm-3, reaching 99. 5% of the theoretical density. The morphological characterization shows that the target has a smooth surface with few holes and uniform distribution of elements, and this target can produce high-performance thin films.

Published
2019
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136. Surface Electronic Structure Engineering of Manganese Bismuth Tellurides Guided by Micro‐Focused Angle‐Resolved Photoemission

Author

Volckaert, Klara, primary, Majchrzak, Paulina, additional, Biswas, Deepnarayan, additional, Jones, Alfred J. H., additional, Bianchi, Marco, additional, Jiang, Zhihao, additional, Dubourg, Raphaël, additional, Stenshøj, Rasmus Ørnekoll, additional, Jensen, Mads Lykke, additional, Jones, Nykola C., additional, Hoffmann, Søren V., additional, Mi, Jian‐Li, additional, Bremholm, Martin, additional, Pan, Xing‐Chen, additional, Chen, Yong P., additional, Hofmann, Philip, additional, Miwa, Jill A., additional, and Ulstrup, Søren, additional

Published
2023
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149. Lifetime Measurements in 120Xe

Author

Walpe, J. C., Davis, B. F., Naguleswaran, S., Reviol, W., Garg, U., Pan, Xing-Wang, Feng, Da Hsuan, and Saladin, J. X.

Subjects
Nuclear Experiment, Nuclear Theory
Abstract

Lifetimes for the lowest three transitions in the nucleus $^{120}$Xe have been measured using the Recoil Distance Technique. Our data indicate that the lifetime for the $2_{1}^{+} \to 0_{1}^{+}$ transition is more than a factor of two lower than the previously adopted value and is in keeping with more recent measurements performed on this nucleus. The theoretical implications of this discrepancy and the possible reason for the erroneous earlier results are discussed. All measured lifetimes in $^{120}$Xe, as well as the systematics of the lifetimes of the 2$_{1}^{+}$ states in Xe isotopes, are compared with predictions of various models. The available data are best described by the Fermion Dynamic Symmetry Model (FDSM)., Comment: 9 pages, RevTeX, 3 figures with Postscript file available on request at Umesh.Garg.1@nd.edu, pan@einstein.physics.drexel.edu. Submitted to Phys. Rev. C

Published
1995
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150. Single-Particle Nondegeneracy and SU(3) Fermion Dynamical Symmetry

Author

Wu, Cheng-Li, Feng, Da Hsuan, Guidry, Mike W., Chen, Hsi-Tseng, and Pan, Xing-Wang

Subjects
Nuclear Theory
Abstract

It is shown that the SU(3) symmetry of the fermion dynamical symmetry model is essentially preserved even for highly nondegenerate spherical single-particle energies. The breaking of SU(3) symmetry by single-particle energy terms for either normal deformation or superdeformation occurs only through an indirect Pauli effect and is significant only when the spherical single-particle splitting within shells is artificially large relative to that observed experimentally.

Published
1994
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