Thermodynamics of the Mg-B system: Implications for the deposition of MgB2 thin films

Abstract

We have studied thermodynamics of the Mg-B system with the modeling technique CALPHAD 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 constraint places severe temperature constraints on deposition techniques employing high vacuum conditions.

References in corpus (1)

• Boron Isotope Effect in Superconducting MgB${}_2$

Cited by in corpus (25)

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• Synthesis and Stoichiometry of MgB2
• Theory of Cross Phenomena and Their Coefficients Beyond Onsager Theorem
• In-situ growth of superconducting MgB2 thin films by molecular beam epitaxy
• MgB2 single crystals: high pressure growth and anisotropic properties
• Experimental study of MgB2 decomposition
• Superconducting properties of nanocrystalline MgB${}_2$ thin films made by an in situ annealing process
• Low Temperature Fabrication of MgB2
• Single crystal growth of MgB2 and thermodynamics of Mg-B-N system at high pressure
• Thermochemistry of MgB2 Thin Film Synthesis
• Strongly connected ex-situ MgB2 polycrystalline bulks fabricated by solid-state self-sintering
• Influence of the starting composition on the structural and superconducting properties of MgB2 phase
• Growth of Strongly Biaxially Aligned MgB2 Thin Films on Sapphire by Post-annealing of Amorphous Precursors
• Synthesis of as-grown superconducting MgB_2 thin films by molecular beam epitaxy in UHV conditions
• Influence of Mg deficiency in MgB2 single crystals on crystal structure and superconducting properties
• In situ annealing of superconducting MgB2 films prepared by pulsed laser deposition
• Nanogranular MgB2 thin films on SiC buffered Si substrates prepared by in-situ method
• Intrinsic nonlinearity probed by intermodulation distortion microwave measurements on high quality MgB2 thin films
• Properties of MgB2 Films Grown at Various Temperatures by Hybrid Physical-Chemical Vapour Deposition
• On Gibbs Equilibrium and Hillert Nonequilibrium Thermodynamics
• Wafer-Scale MgB2 Superconducting Devices
• Preparation and properties of amorphous MgB${}_2$/MgO superstructures: A new model disordered superconductor
• Magnetic anisotropy of thin sputtered MgB2 films on MgO substrates in high magnetic fields