scholarly journals The use of mixed-metal single source precursors for the synthesis of complex metal oxides

2020 ◽  
Vol 56 (6) ◽  
pp. 854-871 ◽  
Author(s):  
Haijiao Lu ◽  
Dominic S. Wright ◽  
Sebastian D. Pike
Keyword(s):  
Metal Oxide ◽  
Metal Oxides ◽  
Oxide Materials ◽  
Single Source ◽  
Feature Article ◽  
Single Source Precursors ◽  
Mixed Metal ◽  
Complex Metal ◽  
Complex Metal Oxides ◽  
Complex Metal Oxide

This Feature Article highlights the use of mixed-metal single source precursors to directly access useful complex metal oxide materials.

scholarly journals Discovery of Complex Metal Oxide Materials by Rapid Phase Identification and Structure Determination

2019 ◽  
Vol 141 (12) ◽  
pp. 4990-4996 ◽  
Author(s):  
Jian Li ◽  
Cong Lin ◽  
Yuxin Min ◽  
Youyou Yuan ◽  
Guobao Li ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Structure Determination ◽  
Phase Identification ◽  
Oxide Materials ◽  
Rapid Phase ◽  
Complex Metal ◽  
Complex Metal Oxide

Aerosol Routes to Perovskite Phase Mixed Metal Oxides

1993 ◽  
Vol 310 ◽  
Author(s):  
C.D. Chandler ◽  
Q. Powell ◽  
M.J. Hampden-Smith ◽  
T.T. Kodas
Keyword(s):  
Metal Oxide ◽  
Low Temperatures ◽  
Perovskite Phase ◽  
Mixed Metal Oxide ◽  
Single Source ◽  
Single Source Precursors ◽  
Mixed Metal ◽  
Oxide Powders ◽  
Metal Organic ◽  
Oxide Particles

AbstractSub-micron sized metal oxide particles were formed via aerosol decomposition using single-source mixed metal-organic precursors specifically designed to decompose at low temperatures. The advantage of these single-source precursors over mixtures of individual precursors is that each particle contains a fixed stoichiometry and molecular level homogeneity. Furthermore, the loss of volatile intermediates (such as PbO) may be avoided. Aerosol processing routes can produce uniform sub-micron sized powder that can be sintered at low temperatures for various thin film and membrane applications. The single-source precursors were prepared in pyridine by reaction of divalent metal α-hydroxycarboxylates of general empirical formula A(O2CCMe2OH)2 (where A = Pb, Ca, Sr, Ba; Me = methyl) with metal alkoxides (for example, Ti(O-i-Pr)4) with the elimination of two equivalents of alcohol. These species were then hydrolyzed in solution and yellow powders were isolated by removal of the pyridine solvent in vacuo. These powders were dissolved in water and used to prepare mixed metal oxide powders via spray pyrolysis. Phase-pure submicron-sized particles of PbTiO3 and BaTiO3 were produced at temperatures of 600-900 °C. The particles were hollow, ranged in size from 0.1 to 1 μm and consisted of 30-50 nm crystallites.

Single Source Precursors for Semiconducting Metal Oxide-Based Films

2016 ◽  
pp. 26-41
Author(s):  
Carolina Egler Lucas ◽  
Carlos Lizandara Pueyo
Keyword(s):  
Thin Films ◽  
Metal Oxide ◽  
Scientific Research ◽  
Semiconductor Materials ◽  
Oxide Materials ◽  
Single Source ◽  
Single Source Precursors ◽  
Important Group ◽  
Semiconducting Metal Oxide

Materials possessing interesting properties for current and future everyday products always have a valuable place in the scientific research. Accordingly, semiconductor materials are the foundation of modern electronics. In most of the applications, metal oxide based semiconductors are at present generally useful in the form of thin films. Metal–alkoxo complexes constitute a very important group of precursors for oxide materials. The most common chemical approaches are well described in the literature and the most relevant pathways will be summarized later in this chapter.

scholarly journals First-Principles and Thermodynamics Comparison of Compositionally-Tuned Delafossites: Cation Release from the (001) Surface of Complex Metal Oxides

2019 ◽  
Author(s):  
Joseph W. Bennett ◽  
Diamond Jones ◽  
Blake G. Hudson ◽  
Joshua Melendez-Rivera ◽  
Robert Hamers ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Driving Forces ◽  
Structure Type ◽  
Solution Chemistry ◽  
Lattice Stability ◽  
Operational Conditions ◽  
Electric Cars ◽  
Complex Metal ◽  
Complex Metal Oxides ◽  
Complex Metal Oxide

<p> Nanoscale complex metal oxides have transformed how technology is used around the world. A ubiquitous example is the class of electroreactive cathodes used in Li-ion batteries, found in portable electronics and electric cars. Lack of recyling infrasructure and financial drivers contribute to improper disposal, and ultimate introduction of these materials into the environment. Outside of sealed operational conditions, it has been demonstrated that complex metal oxides can transform in the environment, and cause negative biological impact through leaching of cations into aqueous phases. Using a combined DFT + Thermodynamics analysis, insights into the mechanism and driving forces of cation release can be studied at the molecular-level. Here, we describe design principles that can be drawn from previous collaborative research on complex metal oxide dissoltuion of the Li(Ni<sub>y</sub>Mn<sub>z</sub>Co<sub>1−y−z</sub>)O2 family of materials, and go on to posit ternary complex metal oxides in the delafossite structure type with controlled release behavior. Using equistoichiometric formulations, we use DFT + Thermodynamics to model cation release. The trends are discussed in terms of lattice stability, solution chemistry/solubility limits, and electronic/magnetic properties. Inercalation voltages are calculated and discussed as a predictive metric for potential functionality of the model materials.</p>

scholarly journals First-Principles and Thermodynamics Comparison of Compositionally-Tuned Delafossites: Cation Release from the (001) Surface of Complex Metal Oxides

2019 ◽  
Author(s):  
Joseph W. Bennett ◽  
Diamond Jones ◽  
Blake G. Hudson ◽  
Joshua Melendez-Rivera ◽  
Robert Hamers ◽  
...  
Keyword(s):  
Metal Oxides ◽  
Driving Forces ◽  
Structure Type ◽  
Solution Chemistry ◽  
Lattice Stability ◽  
Operational Conditions ◽  
Electric Cars ◽  
Complex Metal ◽  
Complex Metal Oxides ◽  
Complex Metal Oxide

<p> Nanoscale complex metal oxides have transformed how technology is used around the world. A ubiquitous example is the class of electroreactive cathodes used in Li-ion batteries, found in portable electronics and electric cars. Lack of recyling infrasructure and financial drivers contribute to improper disposal, and ultimate introduction of these materials into the environment. Outside of sealed operational conditions, it has been demonstrated that complex metal oxides can transform in the environment, and cause negative biological impact through leaching of cations into aqueous phases. Using a combined DFT + Thermodynamics analysis, insights into the mechanism and driving forces of cation release can be studied at the molecular-level. Here, we describe design principles that can be drawn from previous collaborative research on complex metal oxide dissoltuion of the Li(Ni<sub>y</sub>Mn<sub>z</sub>Co<sub>1−y−z</sub>)O2 family of materials, and go on to posit ternary complex metal oxides in the delafossite structure type with controlled release behavior. Using equistoichiometric formulations, we use DFT + Thermodynamics to model cation release. The trends are discussed in terms of lattice stability, solution chemistry/solubility limits, and electronic/magnetic properties. Inercalation voltages are calculated and discussed as a predictive metric for potential functionality of the model materials.</p>

scholarly journals Thermochemical Energy Storage Performance Analysis of (Fe,Co,Mn)Ox Mixed Metal Oxides

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 362
Author(s):  
Yabibal Getahun Dessie ◽  
Qi Hong ◽  
Bachirou Guene Lougou ◽  
Juqi Zhang ◽  
Boshu Jiang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Redox Reaction ◽  
Gas Flow ◽  
Oxygen Exchange ◽  
Engineering Industry ◽  
Oxide Material ◽  
Oxide Materials ◽  
Uptake Ratio

Metal oxide materials are known for their ability to store thermochemical energy through reversible redox reactions. Metal oxides provide a new category of materials with exceptional performance in terms of thermochemical energy storage, reaction stability and oxygen-exchange and uptake capabilities. However, these characteristics are predicated on the right combination of the metal oxide candidates. In this study, metal oxide materials consisting of pure oxides, like cobalt(II) oxide, manganese(II) oxide, and iron(II, III) oxide (Fe3O4), and mixed oxides, such as (100 wt.% CoO, 100 wt.% Fe3O4, 100 wt.% CoO, 25 wt.% MnO + 75 wt.% CoO, 75 wt.% MnO + 25 wt.% CoO) and 50 wt.% MnO + 50.wt.% CoO), which was subjected to a two-cycle redox reaction, was proposed. The various mixtures of metal oxide catalysts proposed were investigated through the thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), energy dispersive X-ray (EDS), and scanning electron microscopy (SEM) analyses. The effect of argon (Ar) and oxygen (O2) at different gas flow rates (20, 30, and 50 mL/min) and temperature at thermal charging step and thermal discharging step (30–1400 °C) during the redox reaction were investigated. It was revealed that on the overall, 50 wt.% MnO + 50 wt.% CoO oxide had the most stable thermal stability and oxygen exchange to uptake ratio (0.83 and 0.99 at first and second redox reaction cycles, respectively). In addition, 30 mL/min Ar–20 mL/min O2 gas flow rate further increased the proposed (Fe,Co,Mn)Ox mixed oxide catalyst’s cyclic stability and oxygen uptake ratio. SEM revealed that the proposed (Fe,Co,Mn)Ox material had a smooth surface and consisted of polygonal-shaped structures. Thus, the proposed metallic oxide material can effectively be utilized for high-density thermochemical energy storage purposes. This study is of relevance to the power engineering industry and academia.

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