Related Experiment Video
Updated: Oct 7, 2025
12:37
Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
Published on: September 4, 2015
12.5K
Nb/Sn Liquid-Solid Reactive Diffusion Couples and Their Application to Determination of Phase Equilibria and
Jiali Zhang1, Jing Zhong1, Qin Li1
1State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|January 11, 2022
Summary
Researchers developed a new method to study niobium-tin (Nb-Sn) superconductors, crucial for high-field applications. This technique accurately determined phase equilibria and diffusion data, vital for advancing superconductor design.
Area of Science:
- Materials Science
- Metallurgy
- Superconductivity
Background:
- Niobium-tin (Nb3Sn) is critical for high-field superconducting applications.
- Experimental data on Nb-Sn phase equilibria and diffusion is scarce due to fabrication challenges.
- Accurate thermodynamic and kinetic data are essential for designing advanced Nb3Sn superconductors.
Purpose of the Study:
- To propose a novel method for preparing Nb-Sn liquid-solid reactive diffusion couples (LSDCs).
- To determine phase equilibria and interdiffusion coefficients in the Nb-Sn system.
- To provide valuable data for thermodynamic and kinetic modeling of Nb-Sn alloys.
Main Methods:
- Preparation of Nb/Sn liquid-solid reactive diffusion couples (LSDCs) at 1100 °C and 1200 °C.
- Phase identification of the formed layer using experimental techniques.
- Measurement of composition-distance profiles and determination of phase equilibria and interdiffusion coefficients using HitDIC software.
Main Results:
- The formed layer in Nb/Sn LSDCs was identified as Nb3Sn.
- Determined phase equilibria align well with assessed Nb-Sn phase diagrams.
- Calculated interdiffusion coefficients and activation energy are consistent with existing literature data.
Conclusions:
- The developed LSDC method is effective for studying Nb-Sn alloys with large melting point differences.
- The obtained phase equilibria and interdiffusion coefficients are valuable for Nb-Sn system modeling.
- The LSDC approach is potentially applicable to other alloy systems with significant melting point disparities.
Related Concept Videos
01:10Recrystallization: Solid–Solution Equilibria
1.4K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
1.4K
03:10The Equilibrium Constant
50.4K
Consider the oxidation of sulfur dioxide:
50.4K
01:01Distillation: Vapor–Liquid Equilibria
3.0K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
3.0K
02:21Chemical and Solubility Equilibria
4.3K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.3K
02:54Molecular and Ionic Solids
18.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
18.3K
02:15Homogeneous Equilibria for Gaseous Reactions
26.2K
Homogeneous Equilibria for Gaseous Reactions
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
For gas-phase reactions, the equilibrium constant may be expressed in terms of either the molar concentrations (Kc) or partial pressures (Kp) of the reactants and products. A relation between these two K values may be simply derived from the ideal gas equation and the definition of molarity. According to the ideal gas equation:
26.2K