Iris Publishers Material Science Open Access Journal

Atomic and Electronic Structure in Thin Foils Ni 51 Ti 49 Material Science One of the most famous and widely researched materials with shape memory is titanium nickelide. Materials with shape memory are characterized by the presence of thermoelastic martensite in their structure. Such martensite arises as a result of deformation, leading to mechanochemical reactions in the localization zones of plastic deformation of the nanoscale level [1]. The result of mechanochemical reactions are phases with new structural states, and accordingly, with new properties. In the study of massive samples and thinned foils of titanium nickelide, it was not known about the possibility of the appearance of magnetization in them. For the first time, the authors of [2] indicated this possibility. The authors associated the appearance of magnetization with the appearance of deformation martensite with the tetrahedrally packed Frank – Casper structure. A feature of this structure is the displaceme...

Zero Point Level Effects on Structure, Energy and Spectra of Molecules & Materials Material Science  This review encompasses the considerations that must come into play when dealing with molecules or hydrogen bonded crystals where there are two or more equivalent potential energy minima and those cases where isotopic replacement influences the relative energy or spectral properties such as 13C NMR chemical shifts. In such cases the properties of the zero- point level must be investigated. The specific cases discussed are changes in the relative energies of polymorphic crystal structures, the effect of deuterium substitution on the 13C NMR chemical shifts and the hyperfine coupling constant of a radical species involving addition of either muonium or hydrogen atom. We discuss first molecules with double minimum potentials: ammonia, the potentially aromatic [18] annulene and polyacetylene. Ammonia has minima in its potential energy at equivalent out of plane positio...

Phase Stability of Rare-Earth Sesquioxides - New Approach Material Science Based on low temperature synthesis it was stated that solid rare earth sesquioxides (RESOX) below 2000 °C belong to three structure types as function of temperature and metallic ionic radius. (I) Hexagonal for La 2 O 3 sub> and Nd 2 O 3  with the highest metallic ionic radius, (II) Low Temperature (LT) cubic and High Temperature (HT) monoclinic for Sm 2 O 3 , Eu 2 O 3  and Gd 2 O 3  with medium metallic ionic radius, (III) cubic for Dy 2 O 3 , Y 2 O 3 , Ho2O3, Er 2 O 3 , Tm 2 O  3 sub>, Yb 2 O 3 , Lu 2 O 3  and Sc 2 O 3  with low metallic ionic radius [1,2]. For more Information:  https://irispublishers.com/mcms/fulltext/phase-stability-of-rare-earth-sesquioxides-new-approach.ID.000540.php For More Open Access  Journals  in  Iris Publishers   Please click on:  https://irispublishers.com/ For More Articles in  Modern Con...

On the Experimental Assessment of Thermodynamic Stability of Nanostructured Solid Solutions Material Science Thermal stability in nanocrystalline alloys has been extensively explored using both experimental and theoretical approaches. However, there is rarely any direct evidence of the specific stabilization mechanisms. Therefore, whether the stability is achieved by kinetic barriers or by reaching an equilibrium thermodynamic state remains an open question. Indeed, although kinetic and thermodynamic stabilities are intrinsically different from the conceptual point of view, their experimental assessment, identification, and results interpretation present several difficulties. In this regard, a general agreement about the experimental findings required to ascertain the thermodynamic stability is also still missing. In this work, a thorough discussion on the experimental assessment of thermodynamic stability of nanostructured solid solutions is presented and exper...

Exciton Quasimolecules and Exciton Quasicrystals: Theory Material Science In review, deals with the theory of exciton Quasimolecules in a Nano heterostructures. It has been found that the formation of a exciton Quasimolecules in a Nano heterostructures made up of aluminum oxide quantum dots synthesized in a dielectric matrix is of threshold character and can occur in a Nano systems where the distance D between the surfaces of quantum dots is given by the condition The existence of such distance arises from quantum size effects in which the decrease in the energies of interaction of the electrons and holes entering into the Hamiltonian of the “exciton molecule” with decrease of the distance D between the surfaces of the QD cannot compensate for the increase in the kinetic energy of the electrons and holes. At larger distances D between the surfaces of quantum dots: the biexciton breaks down into two excitons (consis...

Modern Concepts in Material Science Material Science With the improved technologies day by day, it will influence the development and evolution of today society and make life more convenient. From the data center, Internet of Things, robots, self driving cars, artificial intelligence, smart medical care, Geriatric care etc., to future implementations in high-frequency communication, energy management, high-speed computing, and even innovative technologies that use more electronic information to develop various functions of serving humanity is inseparable from the application and combination of semiconductors. Therefore, the breakthrough growth of semiconductor technology will be the key to the future development of science and technology. For more Information:  https://irispublishers.com/mcms/fulltext/modern-concepts-in-material-science.ID.000536.php For More Open Access  Journals  in  Iris Publishers   Please click on: https://...

Two-Dimensional MoS 2  and Heterostructure Growth by Pulsed Laser Deposition Material Science Due to having zero band gap in two-dimensional graphene shifted the attention towards MoS 2 , WS 2 , and similar inorganic transition metal-based dichalcogenides. Most of them perform indirect to direct band gap crossover form bulk to monolayer make them a potential candidate for optoelectronic device applications [1-4]. MoS 2  is stabilized in 2H semiconducting state, having a band gap of 1.9 eV for monolayer and 1.28 eV for bulk [5-6]. Thinnest transistor based on MoS 2  have been already reported [2]. Based on unique excitons, spin and valley properties, MoS 2  is considered for the next-generation platform for future electronics [7-9]. The metastable 1T phase is demanding due to metallicity and shows excellent hydrogen evolution activity [10-12]. This qualitative metal-semiconducting state in 1T-2H phase transition is promising for switchable devic...