نتایج جستجو برای: orthorhombic structure

تعداد نتایج: 1569430  

Journal: :Acta Crystallographica Section A Foundations of Crystallography 1993

Journal: :Acta Chemica Scandinavica 1963

حکمت, مریم , دادرس, صدیقه , دادمهر, وحید, صفری, محمد رضا ,

  Obtaining the superconductor samples or mainly, structural phase controlling in 123 systems is a matter of special importance. As decreasing of oxygen in this structure has special effects, and mainly causing structural phase transition, by investigating the structure and thermal analysis of the system, tetragonal-orthorhombic structural phase transition was observed and optimum contents of s...

Journal: :Acta Crystallographica Section C Crystal Structure Communications 1995

اسماعیلی, امیرسجاد, حکیمی, محسن, مختاری, حسین, نظری, فریبا,

In this paper, milling was investigated as a method for production of Mn-Ga binary alloys and the effect of milling process on phase formation of Mn:Ga samples with 2:1 and 3:1 ratio within 1, 2 and 5 hour milling times was studied. For Mn:Ga samples, according to the results, Mn1.86Ga compound with tetragonal structure and I4/mmm space group was a stable phase. Also, some amounts of  Mn3G...

1999
G. Ceder S. K. Mishra

LiMnO2 is one of only a few ternary oxides which are known to form in the orthorhombic Pmmn structure. The layered α-NaFeO2 structure, favored for application as a Li-insertion electrode, is found in many other alkali transition metal oxides. We find that the the strong antiferromagnetic interactions between Mn+3 ions contribute to the stabilization of the orthorhombic structure. Using first-pr...

Journal: :Acta crystallographica. Section C, Crystal structure communications 2013
Peter Müller Frank R Fronczek Stacey J Smith Teresa Mako Mindy Levine

A second, monoclinic, polymorph of the title compound, C(14)H(8)Cl(2), has been found. In addition to the structure of this monoclinic form, the structure of the previously described orthorhombic form [Desvergne, Chekpo & Bouas-Laurent (1978). J. Chem. Soc. Perkin Trans. 2, pp. 84-87; Benites, Maverick & Fronczek (1996). Acta Cryst. C52, 647-648] has been redetermined at low temperature and usi...

2007
ERIC COCKAYNE

We study the energetics of quasicrystals using a lattice gas simulation to sample atomic conngurations close to the quasicrystal and its approximants. The total potential energy for each connguration is calculated by summing electronic structure based pair potentials. We apply this method to study Al 73 Co 24 in a 14.4 A by 12.3 A by 8.1 A orthorhombic cell. The structures obtained are compared...

تجبر, ناصر, فوجی, ابولقاسم,

A software in fortran is developed to determine crystal structure of cubic. tetragonal. hexago nal and orthorhombic crystals from powder ditTraction d values. The general 1t6s method is also used for triclinic and monoclinic crystals.

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