Vol. 4 No. 1 (2022)

Open Access

Editorial

Article ID: 565

The Influence of the Metal Microstructure on the Breakdown Mechanism of Schottky Diodes

by Shahlar Gachayogli Askerov, M. G. Gasanov, L. KAbdullayeva

Materials Physics and Chemistry, Vol.4, No.1, 2022; 794 Views, 11 PDF Downloads

In this paper, the influence of the microstructure of a metal on the breakdown mechanism of diodes with a Schottky barrier is studied. It is shown that in electronic processes occurring in the contact between a metal and a semi-conductor, the metal plays a very active role and is a more important contact partner than a semiconductor. Unlike the known mechanisms of breakdown of diodes (avalanche, tunnel and thermal), another mechanism is proposed in this paper - the geometric mechanism of the reverse current flow of Schottky diodes made using a metal with a poly-crystalline structure. The polycrystallinity of a metal transforms a homogeneous contact into a complex system, which consists of parallel-connected multiple elementary contacts having different properties and parameters.

Open Access

Editorial

Article ID: 567

Controllable Synthesis of h-WO3 Nanoflakes by L-lysine Assisted Hydrothermal Route and Electrochemical Characterization of Nanoflakes Modified Glassy Carbon Electrode

by Vijaya Kumar Gangaiah, Ashoka Siddaramanna, Prashanth Shivappa Adarakatti, Gujjarahalli Thimanna Chandrappa

Materials Physics and Chemistry, Vol.4, No.1, 2022; 845 Views, 12 PDF Downloads

Hexagonal tungsten trioxide (h-WO3) nanoflakes have been synthesized by a hydrothermal approach using L-lysine as the shape directing agent. The influence of hydrothermal reaction time and L-lysine content on the morphology of h-WO3 was investigated. The experimental results showed that the nanoflake morphology could be achieved at higher concentration of L-lysine. Based on the evolution of nanoflake morphology as a function of hydro-thermal duration, a “dissolution-crystallization-Ostwald ripening” growth mechanism has been proposed. The electro-chemical performance of h-WO3 nanoflakes has also been investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). It is found that h-WO3 modified glassy carbon electrode (GCE) showed lower charge transfer resistance and enhancement in peak current attributed to the enrichment in electroactive surface area and faster electron transfer kinetics at h-WO3 modified GCE.

Open Access

Editorial

Article ID: 568

A New Antibacterial Agent: Propolis

by Özge İn şaatçi, Necla Yaman Turan

Materials Physics and Chemistry, Vol.4, No.1, 2022; 763 Views, 9 PDF Downloads

As textile products are being used widely in Daily life, their antibacterial characteristics gain more importance. The necessity of antibacterial agents used due to the importance given to today's health and alternative products provided by natural routes has also revealed the necessity of this context. This work focuses on the usage of propolis as an antibacterial agent. On the other hand, it aims to gather information on the use of propolis for the purpose of giving antibacterial properties to textile materials. 

Open Access

Original Research Articles

Article ID: 560

Classification, preparation process and its equipment and applications of piezoelectric ceramic

by Quanlu Zhao, Juntao Zhao, Xiangfeng Tan

Materials Physics and Chemistry, Vol.4, No.1, 2022; 801 Views, 12 PDF Downloads

The so-called piezoelectric ceramic is a piezoelectric polycrystal, a functional ceramic material capable of inter-converting mechanical energy and electric energy. It belongs to inorganic nonmetallic materials. So far, the most widely used piezoelectric ceramic materials have both good piezoelectricity and ferroelectricity through the substitution and doping in a wide range to adjust its properties to meet the different needs of zirconium titanium lead (PZT) and its composite materials. Piezoelectric ceramic is also one of the prevailing piezoelectric materials, accounting for about 1/3 of the entire functional ceramic materials. It is mainly used for transducers, sensors, resonators and drives.

Open Access

Original Research Articles

Article ID: 569

Perspective Material for Photoenergetics on the Basis of Silicon with Binary Elementary Cells

by M. K. Bakhadyrkhanov, U. X. Sodikov, Kh. M. Iliev, S. A. Tachilin, Tuerdi Wumaier

Materials Physics and Chemistry, Vol.4, No.1, 2018; 864 Views, 7 PDF Downloads

The paper proposes a scientifically-grounded, principally-new approach to managing the fundamental parameters of the basic material of electronic engineering as like silicon. The essence of the proposed approach is the formation of binary elementary cells in the silicon lattice involving elements III (B, Al, Ga, Zn) and V (P, As, Sb) groups in the form of Si2GaAs, Si2GaSb, etc. Taking electrical and chemical parameters of these impurity atoms into account, as well as their diffusion parameters in Si, the formation is determined by the most suitable pairs of atoms of groups III and V that allow obtaining silicon with the necessary composition and structure of binary elementary cells, as well as their more complex associations, up to the formation of nanocrystals of semiconductor connections AIIIBV. It is shown that by controlling the composition, structure and concentration of binary elementary cells, it is possible to significantly expand the spectral sensitivity of silicon, both in the IR and hλ > Eg directions. The formation of nanoclusters of AIIIBV semiconductor compounds in the silicon lattice significantly changes the emissivity of the material. It is established that the successive diffusion of elements of groups III and V in silicon and additional low-temperature annealing under certain thermodynamic conditions make it possible to ensure the maximum participation of the impurity atoms introduced in the formation of binary elementary cells. Silicon with binary elementary cells involving atoms of groups III and V is a new class of semiconductor material with unique functionality for modern optoelectronics and photoenergetics.

Open Access

Original Research Articles

Article ID: 570

Numerical Simulation of Macrosegregation Impurities in the Solidifying Continuous Casting Steel Billet

by Oleksandr Volodimirovich Hress, O. B. Isayev, O. O. Chebotaryova, Kaiming Wu

Materials Physics and Chemistry, Vol.4, No.1, 2022; 702 Views, 12 PDF Downloads

In this study, new theoretical conceptions have been developed about an impurity segregation mechanism at the time of alloy solidification considering present microvolumes with different chemical compositions during alloy solidification. It has been concluded that this conception allows to establish and optimize technologic parameters that influence the production of the main types of macro-heterogeneity. The derived model conceptions have confirmed the final condition of real continuous casting billets by using the advanced analyzing methods.  Highlights  · The quasi-equilibrium theory used to study the hardening processes of alloys has been expanded and improved. · The development of a numerical model for macrosegregation impurities in solidifying continuous casting billet is suggested. · The adequacy of the developed model is checked under the industrial conditions using comparison theoretical · calculations and practical data. · The results and developments that are obtained are discussed.