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23 Apr 2012

Volume 100, Issue 17, Articles (17xxxx)

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Appl. Phys. Lett. 100, 171903 (2012); http://dx.doi.org/10.1063/1.4704193 (3 pages)

Y. Peng and K. Kempa
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A pulse-modulated nonequilibrium atmospheric-pressure microwave argon plasma discharge preionized by a kilohertz excited plasma jet

Shou-Zhe Li, Mao-Chun Xu, Xin Zhang, and Jialiang Zhang

Appl. Phys. Lett. 100, 174101 (2012); http://dx.doi.org/10.1063/1.4705433 (4 pages) | Cited 1 time

Online Publication Date: 23 April 2012

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A pulse-modulated nonequilibrium atmospheric-pressure microwave argon surface wave plasma is generated by means of a preionization discharge with a single-electrode plasma jet driven by a power supply of 50 kHz. It is found that the electron induced Saha-like balance dominates excitation process in the plasma discharge through the electron temperature varying with the microwave input power and the applied voltage of kilohertz power supply. The microwave pulse-modulating effect on nonequilibrium characteristics of dual-frequency exciting argon surface wave plasma is studied by spectroscopic measurement of the excitation temperature and gas temperature.
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52.80.Pi High-frequency and RF discharges
52.25.Jm Ionization of plasmas
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables
52.75.-d Plasma devices

Microstructure and magnetocaloric effect of melt-spun Ni52Mn26Ga22 ribbon

Z. B. Li, J. L. Sánchez Llamazares, C. F. Sánchez-Valdés, Y. D. Zhang, C. Esling, X. Zhao, and L. Zuo

Appl. Phys. Lett. 100, 174102 (2012); http://dx.doi.org/10.1063/1.4704780 (4 pages) | Cited 2 times

Online Publication Date: 27 April 2012

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Microstructural features and magnetocaloric properties of Ni52Mn26Ga22 melt-spun ribbons were studied. Results show that there are four types of differently oriented variants of seven-layered modulated (7M) martensite at room temperature, being twin-related one another and clustered in colonies. Due to the coupled magnetic and structural transformations between parent austenite and 7M martensite, the melt-spun ribbons exhibit a significant magnetocaloric effect. At an applied magnetic field of 5 T, an absolute maximum value of the isothermal magnetic entropy change of 11.4 J kg−1 K−1 is achieved with negligible hysteresis losses.
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75.30.Sg Magnetocaloric effect, magnetic cooling
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
81.30.Kf Martensitic transformations
64.70.kd Metals and alloys
61.72.Mm Grain and twin boundaries
75.30.Kz Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)
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