Thermodynamic assessment of the As–Zn and As–Ga–Zn systems

Abstract

We have performed a thermodynamic assessment of the As-Zn and As-Ga-Zn systems. The systems are assessed based on the CALPHAD method and using available first principles and experimental data. Using the optimized set of parameters found in this work, the calculated As-Zn binary phase diagram, isoplethal sections and the monovariants lines of the As-Ga-Zn ternary system are presented. The comparison of the calculated diagrams with the experimental and first principles data shows good agreement.

Obtaining of Mg-Zn Co-Doped GaN Powders via Nitridation of the Ga-Mg-Zn Metallic Solution and Their Structural and Optical Properties

“…To obtain the Mg-Zn co-dopedGaN, the powders were used 1.32 g of metallic gallium (19.02 mmol), 5.20 mg of metallic magnesium (0.21 mmol ∼ = 0.4%), and 7.80 mg of metallic zinc (0.12 mmol ∼ = 0.6%). To obtain the undoped GaN powders, 3.37 g (48.41 mmol) of metallic gallium was used, following the process realized in our before work [18]. The reaction formulated to obtain the Mg-Zn co-dopedGaN material is the following [17]:…”

“…To begin the process of synthesis of Mg-Zn co-dopedGaN powders, the general preparation of the metallic solution was carried out according to the work of Gastellou et al [18]. Once obtained, the metallic solution was introduced inside a chemical vapor deposition furnace (CVD), whereupon the CVD system was purged, and later an N 2 flow at 50 sccm was opened and was allowed to flow into the atmosphere.…”

“…Once obtained, the metallic solution was introduced inside a chemical vapor deposition furnace (CVD), whereupon the CVD system was purged, and later an N 2 flow at 50 sccm was opened and was allowed to flow into the atmosphere. After, to ensure the diffusion of Zn atoms into the gallium of the Ga-Zn liquid solution, the temperature was increased to 440 • C for 40 min [18,19]. On the other hand, to ensure the diffusion of Mg atoms into the metallic gallium of the Ga-Mg-Zn metallic solution, the temperature was increased to 670 • C for 40 min (20 • C above the Mg melting point) [20,21].…”

Calculation of Hole Concentrations in Zn Doped GaAs Nanowires

“…The chemical potentials of Zn and Ga in the liquid quaternary alloy catalyst particle containing Zn, Ga, As, and Au were calculated using the software Thermo-Calc [ 22 ]. The thermodynamic data were extrapolated from the As-Ga-Zn ternary system [ 23 ] and the As-Ga [ 24 ], As-Zn [ 23 ], As-Au [ 25 ], Au-Ga [ 26 ], Au-Zn [ 27 ], and Ga-Zn [ 28 ] binary systems. When using Thermo-Calc’s graphical interface for chemical potential calculations, a reference state has to be chosen and we choose the enthalpy of the stable state at 298 K and 1 bar as reference state for each species.…”

Sonochemical synthesis of supersaturated Ga–Al liquid-alloy fine particles and Al3+-doped γ-Ga2O3 nanoparticles by direct oxidation at near room temperature

“…Owing to the low melting point of metallic Ga ( T m = 29.8 °C), liquid Ga-based alloys (Ga–M; M = In, Al, Zn, etc.) can be obtained at low temperatures [21] , [22] , [23] . However, at room temperature, considering energy conservation, only a small atomic percentage of metal (2.1 atom% for Al) can dissolve in liquid Ga at 25 °C.…”