scholarly journals Microwave Dielectrics Based on Complex Oxide Systems

10.5772/51168 ◽  
2012 ◽  
Author(s):  
A.G. Belous
Keyword(s):  
Complex Oxide ◽  
Oxide Systems ◽  
Microwave Dielectrics

Synthesis of YFeO3-δ and LaFeO3-δ Perovskites with High Catalytic Activity in Carbon Oxidation Reactions

2021 ◽  
Vol 316 ◽  
pp. 105-109
Author(s):  
Evgeny A. Kirichenko ◽  
Pavel G. Chigrin ◽  
Anton A. Gnidenko
Keyword(s):  
Oxidation Mechanism ◽  
Soot Oxidation ◽  
Complex Oxide ◽  
Maximum Temperature ◽  
High Catalytic Activity ◽  
Carbon Oxidation ◽  
Oxidation Reactions ◽  
Oxide Systems ◽  
Reduction Of Metal Oxides ◽  
Catalytic Reaction Mechanism

YFeO3-δ (δ = 0.26) and LaFeO3-δ (δ = 0.5) perovskites with a high specific surface and oxygen non-stoichiometry was firstly synthesized by pyrolysis of polymer-salt compositions. It was shown that the catalytic oxidation of carbon in the presence of these complex oxide systems proceeds in the range of 400 - 700 °С, with a maximum temperature at 556 °С for YFeO3-δ; and 380 - 620 °С ,with a maximum temperature at 501 °С for LaFeO3-δ, in one-stage mode for both. By means of thermal analysis and diffractometry, it was shown that there is no contribution to the soot oxidation mechanism by cyclic perovskite surface transformations, due to the reduction of metal oxides by the soot and their subsequent reoxidation. It has been established that the basis of the catalytic reaction mechanism for both perovskites is the presence of oxygen vacancies on the surface of complex oxides.

A Study of Evaporation of Complex Oxide Systems Based on Chromium(III) Oxide

2003 ◽  
Vol 76 (10) ◽  
pp. 1564-1567 ◽  
Author(s):  
V. A. Popov ◽  
S. I. Lopatin ◽  
L. Sh. Tsemekhman ◽  
L. A. Pavlinova ◽  
S. P. Kormilitsyn ◽  
...  
Keyword(s):  
Complex Oxide ◽  
Oxide Systems

scholarly journals CHARACTERIZATION OF THE SOL-GEL PROCESS IN THE SYSTEM YxBax+nCu2x+nOδ (x = 1, n=1, x=2, n=3, x=3, n=2)

2017 ◽  
pp. 31-34
Author(s):  
A. Pilipenko ◽  
I. Fesych ◽  
S. Nedilko ◽  
A. Dzyazko
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Solid Phase ◽  
Sol Gel ◽  
Complex Oxide ◽  
Present Calculation ◽  
Calculation Algorithm ◽  
Oxide Systems ◽  
Chemical Homogeneity ◽  
Lower Temperature

With the help of sol-gel technology was obtained superconducting compound number YxBax+nCu2x+nOδ (x=1, n=1; x=2, n=3; x=3, n=2) with submicron size particles. As a gel maker in these systems was used citric acid monohydrate. An extensive scheme fusion technology was shown. The process described synthesis using thermal, infrared spectroscopic analysis and scanning electron microscopy. There are some aggregations of microparticles mostly for the phases that are synthesized at higher temperatures. Due to Thermal Analysis of modes were optimized heat treatment samples. According to IR spectroscopy were controlled processes of decomposition of the charge and the formation of the superconducting phase. It was grounded the choice of analysis methods for the starting compounds and the present calculation algorithm for this synthesis. Studies have shown that even at the beginning of the synthesis batch contained no impurity compound allowing argued that the sol-gel synthesis is a promising method that provides high homogeneity of the material the early stages of the synthesis and enables lower temperature and a subsequent heat treatment. The results of electron microscopy showed that due to the relatively low temperature of synthesis occurs the formation of submicron sized particles, while solid-phase techniques facilitate rapid crystal growth due to the formation of liquid phases at high temperature. The principles and ideas described in this paper can be adapted to more complex oxide systems. Thus, in this paper describes how you can achieve chemical homogeneity at the molecular level in multicomponent systems YxBax+nCu2x+nOδ (x=1, n=1; x=2, n=3; x=3, n=2) using sol-gel technology.

scholarly journals Molybdenum Trioxide on Anatase TiO2(101) - Formation of Monodispersed (MoO3)1 Monomers from Oligomeric (MoO3)n Clusters

2020 ◽  
Author(s):  
Nassar Doudin ◽  
Gregory Collinge ◽  
Pradeep Kumar Gurunathan ◽  
Mal Soon Lee ◽  
Vassiliki-Alexandra Glezakou ◽  
...  
Keyword(s):  
Molybdenum Trioxide ◽  
Theoretical Calculations ◽  
Complex Oxide ◽  
Oxide Systems ◽  
Design And Synthesis ◽  
Saturation Coverage ◽  
Resolution Imaging ◽  
Complete Layer ◽  
Immense Potential ◽  
Ordered Layers

<p>Complex oxide systems with hierarchical order are of critical importance in material science and catalysis. Despite their immense potential, their design and synthesis are rather difficult. In this study we demonstrate how the deposition of small oligomeric (MoO<sub>3</sub>)<sub>1-6</sub> clusters, which can be formed by the sublimation of MoO<sub>3</sub> powders, leads to the formation of locally ordered layers of (MoO<sub>3</sub>)<sub>1</sub> monomers on anatase TiO<sub>2</sub>(101). Using both high-resolution imaging and theoretical calculations, we show that at room temperature, such oligomers undergo spontaneous dissociation to their monomeric units. In initial stages of the deposition, this is reflected by the observation of one to six neighboring (MoO<sub>3</sub>)<sub>1</sub> monomers that parallel the size distribution of the oligomers. A transient mobility of such oligomers on both bare TiO<sub>2</sub>(101) and (MoO<sub>3</sub>)<sub>1</sub> covered areas is key to the formation of a complete layer with a saturation coverage of one (MoO<sub>3</sub>)<sub>1</sub> per two undercoordinated surface Ti sites. We further show that such layers are stable to 500 K, making them highly suitable for a broad range of applications. </p>

Modeling, Development and Creation of Ferroactive Materials Based on Multicomponent Complex Oxide Systems

2020 ◽  
Vol 9 (3) ◽  
pp. 52-63
Author(s):  
K.P. Andryuishin ◽  
◽  
I.N. Andryushina ◽  
I.A. Verbenko ◽  
S.I. Dudkina ◽  
...  
Keyword(s):  
Complex Oxide ◽  
Oxide Systems ◽  
Multicomponent Complex

Synthesis of Precursors of Complex Oxide Systems Using Electrogenerated Reagents

2021 ◽  
Vol 47 (5) ◽  
pp. 489-495
Author(s):  
A. F. Dresvyannikov ◽  
E. V. Petrova ◽  
A. N. Akhmetova ◽  
L. I. Kashfrazieva ◽  
I. D. Tverdov
Keyword(s):  
Complex Oxide ◽  
Oxide Systems
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