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Thermodynamics of the Mg–B system: Implications for the deposition of MgB2 thin films (2001)

Liu, Zi-Kui ; Schlom, D. G.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 78 (2001), S. 3678-3680

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have studied the thermodynamics of the Mg–B system with the calculation of phase diagrams modeling technique using a computerized optimization procedure. Temperature–composition, pressure–composition, and pressure–temperature phase diagrams under different conditions are obtained. The results provide helpful insights into appropriate processing conditions for thin films of the superconducting phase, MgB2, including the identification of the pressure–temperature region for adsorption-controlled growth. Due to the high volatility of Mg, MgB2 is thermodynamically stable only under fairly high-Mg overpressures for likely growth temperatures. This places severe temperature constraints on deposition techniques employing high-vacuum conditions. © 2001 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1376145

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Thermodynamic Modeling of the YO1.5–ZrO2 System (2004)

Jacobson, Nathan S. ; Liu, Zi-Kui ; Kaufman, Larry ; [et al.]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 87 (2004), S. 0

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ISSN: 1551-2916

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: The YO1.5–ZrO2 system consists of five solid solutions, one liquid solution, and one intermediate compound. A thermodynamic description of this system is developed, which allows calculation of the phase diagram and thermodynamic properties. Two different solution models are used—a neutral species model with YO1.5 and ZrO2 as the components and a charged species model with Y3+, Zr4+, O2−, and vacancies as components. For each model, regular and subregular solution parameters are derived from selected phase equilibrium and thermodynamic data. The neutral species and charged species modeling results are compared.