Papers by Keyword: Lattice Constant

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Authors: Sajad Ahmad Dar, Vipul Shrivastav, Umesh Kumar Sakalle
Abstract: Intermetallic compounds are innovative materials and are far superior to conventional metals and alloys. These intermetallic compounds have a great potential in industrial and technological fields because most of the intermetallic compounds are stronger as well asstiffer at elevated temperature and provide far better corrosion resistance than conventional metals and alloys.Over the past few years the scientific interest in the study of these intermetallic compounds emanates greatly because of their high-tech applications. Our motivation of the present studyMgTl mainly consernedon the physical data generation in context with its possible vast applications .We used a theoretical approach within the local density approximation method to study the structural and electronic properties of MgTl by calculating total energy. As far as our calculations are concerned, the band structure shows the overlapping of conduction and valence band thus itis clear that MgTl in its pure form is a good conductor of heat and electricity and falls in the category of metals. We have also calculated lattice parameters, bulkmodules, first order derivative electronic and lattice heat coefficient and Debye temperature.
Authors: Ming Li, Hu Hao, Yin Yin Wang, Zhi Ming Shi
Abstract: This work extracted the iron-rich phases in aluminium alloy containing the iron of 0.3%, 0.6%, 1%, 0.6%, 2% and 5% respectively, and studied the morphology and the structure of the iron-rich phases by using electrolytic extraction technology. The results showed that the iron-rich phase in aluminium alloy is a large number of alpha - Al3Fe and a small amount of lambda - Al13Fe4; the rich iron phases are distributed in aluminum alloy substrate in three-dimensional space, and its metallographic appearances in different sections present sheet, plate and needle-like structure. High resolution electron microscopy shows that lambda - Al13Fe4 and alpha - Al3Fe are tetrahedral structure, and when iron content is 0.3% - 1%, the iron-rich phase transition of lambda - Al13Fe4 to alpha - Al3Fe is influenced by iron content, and alpha - Al3Fe lattice constants a and c are bigger than that of standard value under 0.3% iron content, and alpha - Al3Fe lattice constant a changes little with the increase of iron content, and the lattice constant c becomes larger along with the increase of iron content, and when the iron content is up to 1%, the lattice constant a and c are gradually stabilized; lambda - Al13Fe4 lattice constant a and c are constant.
Authors: Zhuo Fei Song, Qiang Song Wang, Ya Qiang Tian
Abstract: Studied the ABAC pattern quasiperiodic phononic crystal properties by transfer matrix method, The results show that the frequency of ABAC pattern quasiperiodic phononic crystal initial band gap is lower than AB and AC pattern and the band gap is wider, simultaneously produce strongly localized resonant modes in the first band gap, frequency and quantity of the localized resonant modes are different with different parameters of material C. These properties are useful to the fabrication of the acoustic or elastic wave filters.
Authors: Li Li, Shi Bo Xing
Abstract: The lattice constants of crystal are the basis of the valence electron structure calculation with the bond length difference method of the empirical electron theory of the solid and molecules. However, the lattice constants change with temperature and pressure. In this paper, according to the nature of thermal expansion of crystal and generalized Hookes law, the relationships among lattice constants, temperature and pressure are established by using linear thermal expansion coefficient and elastic constant. Taken the lattice constants of hexagonal graphite as an example, the calculation results agree with experimental data greatly, which prove the viability of this calculation method.
Authors: Tsubasa Matsumoto, Shin Ichi Nishizawa, Satoshi Yamasaki
Abstract: Calculations of lattice constant of 4H-SiC and diamond have been carried out. Lattice constant of 4H-SiC trends to decrease when nitrogen concentration increases. On the other hand, lattice constant of 4H-SiC trends to increase when aluminum concentration increases. Lattice constant of boron and phosphorus doped diamond trends to increase when impurity concentration increases. The effect of phosphorus on diamond lattice constant is about six times larger than that of boron.
Authors: Dong Nyung Lee
Abstract: Park et al. measured the deposition and annealing textures of nanocrystalline Ni and Ni- 20 % Fe electrodeposits. They found that the deposition texture of major <100> + minor <111> changed to the texture characterized by major <111> + minor <100> after annealing. They also found that the lattice constants of the <100> oriented grains in the as-deposited state were larger than those of <111> oriented grains. In this paper, a model has been advanced to explain the unusual results of lattice constants, and the texture transition has been discussed.
Authors: Hiroshi Suzuki, Nobuaki Minakawa, Atsushi Moriai, Mitsuhiko Hataya, Yukio Morii
Abstract: In this study, we proposed the high-versatility stress measurement method using neutron diffraction which can determine the residual stress states by measuring the lattice strains in two or three orthogonal directions even if the measured diffraction families were different in all three directions. In addition, we also proposed the stress measurement method without using the stress-free lattice spacing d0 which was measured using the powder sample or annealed sample. To verify this method, the residual stress distributions in a shrink-fit ring and plug specimen of aluminum alloy A7075 with texture were measured. The profile of the measured stress distributions almost agreed with the simulated stress distributions in the assumption of the plane stress condition. Our method which can determine the tri-axial stress states using observed lattice strains in two orthogonal directions was secondly applied to evaluate the stress states of A7075, high tensile strength steel HT1000, and Ni-base alloy NCF600 loaded in-situ. Measured stresses almost agreed with theoretical value with 10 MPa to 60 MPa error. On the other hand, the residual stress states of NCF600 were measured under the uni-axial loading condition by the stress measurement method without using the measured d0. Estimated lattice constant a was almost agreed with the lattice constant of its annealed sample, and changes in stress states evaluated using the proposed method coincided with the theoretical value.
Authors: Ke Lei Zhang, Rui Jie Zhao, Qian Kun Lei, Yan Chun Hu
Abstract: Spinel Zn2SnO4 photocatalysts have been prepared by the solid state reaction. as-prepared samples were characterized by power X-ray diffraction, scanning electron microscope, UV-vis diffuse reflectance spectroscopy and photocatalytic activity measurement. The results show that the reaction temperature have significant effects on the Zn2SnO4 photocatalytic activity . It has also been found that the distribution of the cations in Zn2SnO4 crystal lattice changes with the increase of calcination temperature, causing the local structural fine adjustment that associated with the photocatalytic properties.
Authors: T. Hoshina, Junichi Tatami, Takeshi Meguro, Katsutoshi Komeya, Akihiko Tsuge, A. Kuibira, H. Nakata
Authors: De Sheng Fu, Hisao Suzuki, Kenji Ishikawa
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