Gallium Arsenide Dissolution

US4759917A - Oxidative dissolution of gallium arsenide and ...

Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild...

EP0283740B1 - Oxidative dissolution of gallium arsenide ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic

Oxidative dissolution of gallium arsenide and separation ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic. Full Record; Other Related Research; Abstract. The method of dissociating gallium arsenide into a gallium-containing component and an arsenic-containing component, is described which comprises contacting the gallium arsenide with an oxidizing agent and a liquid comprising hydroxamic acid to convert the gallium to ...

Crystallographic forms of dissolution of gallium arsenide ...

Crystallochemical data are used to explain the results of a kinetic study of the process of dissolution of gallium arsenide by the gaseous mixture GaI/sub 3/ +H/sub 2/. The kinetic and morphological study was carried out simultaneously with the help of direct observation of the change in the ...

Oxidative dissolution of gallium arsenide and separation ...

Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions, e.g. with aqueous hydrogen peroxide and mild temperature, to effect separation of gallium hydroxamic acid chelates from water soluble arsenic compounds.

Oxidative dissolution of gallium arsenide and separation ...

Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions. Oxidative dissolution of gallium arsenide and separation of gallium from arsenic - Monsanto Company.

Oxidative dissolution of gallium arsenide and separation ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic. 0283740 - EP88102624B1 - EPO . Application Feb 23, 1988 - Publication Nov 24, 1993 James Patrick Coleman Bruce Francis Monzyk

Gallium arsenide (GaAs) leaching behavior and surface ...

01/07/2018· Gallium arsenide (GaAs) is a material widely used in electronic devices. Disposal of electronic waste containing GaAs in municipal solid waste landfills raises concerns about the public health and ecological risks associated with the potential release of toxic arsenic (As) species. In this study, different tests were performed to investigate the leaching behavior of particulate GaAs in …

Metabolism and excretion of orally and intraperitoneally ...

This study deals with the metabolism of gallium arsenide (GaAs). GaAs was shown to be soluble in various media. Since this compound could dissolve in aqueous solvents, in vivo dissolution was investigated. Hamsters were used to study the dissolution and subsequent pharmacokinetics of any liberated arsenic species. The fecal and urinary excretion data following oral and intraperitoneal …

A Process for the Recovery of Gallium from Gallium ...

Abstract: The recovery of gallium (Ga) from gallium arsenide (GaAs) scrap using a leaching-ion exchange method was investigated. The ground GaAs scrap was leached, using 2.0 N nitric acid at 30 C for 1.0 h, and the dissolution of Ga and arsenic (As) reached 98%. The pregnant solution with a

Oxidative dissolution of gallium arsenide and separation ...

Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions, e.g. with aqueous hydrogen peroxide and mild temperature, to effect separation of gallium hydroxamic acid chelates from water soluble arsenic compounds.

Oxidative dissolution of gallium arsenide and separation ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic. Full Record; Other Related Research; Abstract. The method of dissociating gallium arsenide into a gallium-containing component and an arsenic-containing component, is described which comprises contacting the gallium arsenide with an oxidizing agent and a liquid comprising hydroxamic acid to convert the gallium to ...

EP0283740A3 - Oxidative dissolution of gallium arsenide ...

oxidative dissolution gallium arsenide Prior art date 1987-02-24 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Granted Application number EP88102624A Other versions EP0283740B1 (en EP0283740A2 (en Inventor James Patrick Coleman Bruce Francis …

Crystallographic forms of dissolution of gallium arsenide ...

Crystallochemical data are used to explain the results of a kinetic study of the process of dissolution of gallium arsenide by the gaseous mixture GaI/sub 3/ +H/sub 2/. The kinetic and morphological study was carried out simultaneously with the help of direct observation of the change in the ...

Oxidative dissolution of gallium arsenide and separation ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic. 0283740 - EP88102624B1 - EPO . Application Feb 23, 1988 - Publication Nov 24, 1993 James Patrick Coleman Bruce Francis Monzyk

Gallium arsenide (GaAs) leaching behavior and surface ...

Gallium arsenide (GaAs) ... Additional tests performed to evaluate the dissolution of GaAs under a range of redox conditions, pH levels, ionic strength, and presence of organic constituents commonly found in landfills revealed that oxic environments and mildly alkaline conditions (pH 8.1–8.5) promote release of As (chiefly arsenite) and gallium species to the surrounding aqueous environment ...

A Process for the Recovery of Gallium from Gallium ...

Abstract: The recovery of gallium (Ga) from gallium arsenide (GaAs) scrap using a leaching-ion exchange method was investigated. The ground GaAs scrap was leached, using 2.0 N nitric acid at 30 C for 1.0 h, and the dissolution of Ga and arsenic (As) reached 98%. The pregnant solution with a

Gallium Arsenide (GaAs) Etchants - Solexir

As a III/V semiconductor, gallium arsenide (GaAs) is used for high technology applications such as electronics, optics, photovoltaics, lasers as well as defense and aerospace applications. Like silicon, GaAs wet etching proceeds via the formation of an oxide, or oxides, on the surface followed by dissolution of the oxidized products by either acids or bases. Ga is already in the oxide form (Ga

6.12: Electronic Grade Gallium Arsenide - Chemistry LibreTexts

08/09/2020· Gallium arsenide can be prepared by the direct reaction of the elements, (6.12.2). However, while conceptually simple the synthesis of GaAs is complicated by the different vapor pressures of the reagents and the highly exothermic nature of the reaction. Furthermore, since the synthesis of GaAs at atmospheric pressure is accompanied by its simultaneous decomposes due to the loss by …

The Role of Arsenic in the Mining Industry

Limited quantities of arsenic metal have been recovered from gallium-arsenide semiconductor scrap. [23] Arsenic may also be obtained from copper, gold, and lead smelter flue dust as well as from roasting arsenopyrite, the most abundant ore mineral of arsenic. However, arsenic is not recovered from these sources but is rather disposed of in an environmentally safe manner. Arsenic has been ...

Oxidative dissolution of gallium arsenide and separation ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic. Full Record; Other Related Research; Abstract. The method of dissociating gallium arsenide into a gallium-containing component and an arsenic-containing component, is described which comprises contacting the gallium arsenide with an oxidizing agent and a liquid comprising hydroxamic acid to convert the gallium to ...

Oxidative dissolution of gallium arsenide and separation ...

Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions, e.g. with aqueous hydrogen peroxide and mild temperature, to effect separation of gallium hydroxamic acid chelates from water soluble arsenic compounds.

Crystallographic forms of dissolution of gallium arsenide ...

Crystallochemical data are used to explain the results of a kinetic study of the process of dissolution of gallium arsenide by the gaseous mixture GaI/sub 3/ +H/sub 2/. The kinetic and morphological study was carried out simultaneously with the help of direct observation of the change in the ...

US Patent for Oxidative dissolution of gallium arsenide ...

Oxidative dissolution of gallium arsenide and separation of gallium from arsenic . Feb 24, 1987 - Monsanto Company. Gallium is recovered from gallium arsenide by reacting and dissolving the gallium arsenide with an oxidant and a complexing agent, especially with water insoluble hydroxamic acids with mild conditions, e.g. with aqueous hydrogen peroxide and mild temperature, to effect separation ...

International Journal of Toxicology Cytotoxicity ...

the dissolution of toxic arsenic species. Keywords real-time cell analysis, human bronchial epithelial cells, GaAs, InAs, nanoparticles, impedance Introduction Gallium arsenide (GaAs) and indium arsenide (InAs) materials are being considered for semiconductor manufacturing. In comparison to silicon, these materials have direct band gap,

Nanosize Silicon and Gallium Arsenide Particles Left after ...

15/05/1992· Powders of pure silicon and gallium arsenide were reacted with molten silicate glass of a composition used in our prior work on CdS and CdTe quantum dots in glass [1–4]. After the Si or GaAs agglomerated particles had reacted with the melt for an hour, the material was solidified to obtain a gray-black glass. Ground powders of this glass were again mixed with additional base glass powders to ...

Cytotoxicity Assessment of Gallium- and Indium-Based ...

31/03/2020· Time course of dissolution of gallium arsenide (GaAs) nanoparticles (NPs) (80-100 nm) ( ) and indium arsenide (InAs) NPs (80-100 nm) (•) in 1 g/L NaHCO 3 at pH 7.8. The initial NP concentration was 500 mg/L. Cytotoxicity of Soluble As, In, and Ga Species. It has been suggested that the toxicity of GaAs NPs, and to a lesser extent that of InAs NPs, is due to the As that dissociates in ...

6.12: Electronic Grade Gallium Arsenide - Chemistry LibreTexts

08/09/2020· Gallium arsenide can be prepared by the direct reaction of the elements, (6.12.2). However, while conceptually simple the synthesis of GaAs is complicated by the different vapor pressures of the reagents and the highly exothermic nature of the reaction. Furthermore, since the synthesis of GaAs at atmospheric pressure is accompanied by its simultaneous decomposes due to the loss by …

7.2: Structures of Element and Compound Semiconductors ...

21/03/2021· Since both silicon and gallium arsenide are fcc structures and the {100} and {111} are the only technologically relevant surfaces, discussions will be limited to fcc {100} and {111}. The atom density of a surface may be defined as the number of atoms per unit area. Figure shows a schematic view of the {111} and {100} planes in a fcc lattice. The {111} plane consists of a hexagonal close packed ...

The Role of Arsenic in the Mining Industry

Limited quantities of arsenic metal have been recovered from gallium-arsenide semiconductor scrap. [23] Arsenic may also be obtained from copper, gold, and lead smelter flue dust as well as from roasting arsenopyrite, the most abundant ore mineral of arsenic. However, arsenic is not recovered from these sources but is rather disposed of in an environmentally safe manner. Arsenic has been ...

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