scholarly journals Two-Dimensional Frank−Kasper Z Phase with One Unit-Cell Thickness

Nano Letters ◽  
2021 ◽  
Vol 21 (17) ◽  
pp. 7198-7205
Author(s):  
Hongbo Xie ◽  
Junyuan Bai ◽  
Haiyan Ren ◽  
Shanshan Li ◽  
Hucheng Pan ◽  
...  
Keyword(s):  
Unit Cell ◽  
Two Dimensional ◽  
Cell Thickness

A two-dimensional analytical unit cell model for redox flow battery evaluation and optimization

2021 ◽  
Vol 506 ◽  
pp. 230192
Author(s):  
Yunxiang Chen ◽  
Jie Bao ◽  
Zhijie Xu ◽  
Peiyuan Gao ◽  
Litao Yan ◽  
...  
Keyword(s):  
Cell Model ◽  
Unit Cell ◽  
Two Dimensional ◽  
Redox Flow Battery ◽  
Unit Cell Model ◽  
Flow Battery

Irreducible first Brillouin zone for two-dimensional magnonic crystals with asymmetric complex lattices

2021 ◽  
pp. 2150170
Author(s):  
Hui Yang ◽  
Guo-Hong Yun ◽  
Yong-Jun Cao
Keyword(s):  
Brillouin Zone ◽  
Unit Cell ◽  
Square Lattice ◽  
Two Dimensional ◽  
Area Formula ◽  
Irreducible Part ◽  
Full Band ◽  
Magnonic Crystals ◽  
Magnonic Crystal ◽  
Complex Basis

Two-dimensional (2D) magnonic crystal (MC) with an asymmetric complex basis is proposed in this paper, and its band structures are calculated in the whole area of the first Brillouin zone (BZ). This kind of MCs is composed of two different atoms in the unit cell, and the symmetry of the unit cell is broken due to changes in the position of the second atom, so the irreducible part of the BZ is no longer the small area [Formula: see text] for square lattice, and it must be expanded to the whole first BZ. Only by investigating the whole first BZ, can we get the true full band-gap for this kind of MCs.

scholarly journals Crystallinity fitting using cellulose crystallite models

2014 ◽  
Vol 70 (a1) ◽  
pp. C1135-C1135
Author(s):  
Patrik Ahvenainen ◽  
Ritva Serimaa
Keyword(s):  
Diffraction Pattern ◽  
Cell Structure ◽  
Unit Cell ◽  
Scattering Data ◽  
Crystalline Cellulose ◽  
Two Dimensional ◽  
Cellulose Crystallite ◽  
Cellulose Iβ ◽  
Diffraction Peaks ◽  
Unit Cell Structure

Cellulose is the most abundant biopolymer on Earth and hence it has enormous potential as a source of renewable energy. The nanoscale properties of cellulose are also import for the wood and papermaking industries. The atomic level structure of naturally occurring cellulose Iβ allomorph is well known [1] and this atomistic model is employed in this study for the cellulose unit cell structure. The cellulose crystallinity cannot be measured directly with scattering methods, but the crystallinity of the sample can be estimated by fitting models of crystalline and amorphous contributions to the sample intensity profile. The crystallinity fitting can be enhanced by improving the cellulose fitting model or the amorphous model. We focus on the cellulose crystallite model. The nanoscale level organization of crystalline cellulose in different plant materials is less well established that the unit cell structure of cellulose Iβ. Information on the texture of the sample is obtained efficiently by measuring the sample with a two-dimensional detector. The two-dimensional diffraction pattern can be used to obtain a wealth of information in one measurement, including the crystallite size, crystallite orientation and the crystallinity of the sample. The small size of cellulose crystallites in the wood cell wall limits the information obtainable from the diffraction pattern as the diffraction peaks widen and overlap. The overlapping of certain diffraction peaks can be studied at least qualitatively by computing the diffraction patterns from crystallite models of varying dimensions. Different models for cellulose crystallite have been suggested in the literature, such as the 36 chain model [2]. We investigate how the crystallinity fitting is influenced by the selected cellulose crystallite model and evaluate the suitability of different models to experimental X-ray scattering data of plant material, wood and highly crystalline cellulose.

Ion Beam Modification of BiSrCaCuO Ultrathin Films of Nearly Three Half-Unit-Cell Thickness

1996 ◽  
Vol 35 (Part 2, No. 3B) ◽  
pp. L387-L390 ◽  
Author(s):  
Jonghun You ◽  
Masatsugu Kaise ◽  
Kazuo Saito
Keyword(s):  
Ultrathin Films ◽  
Ion Beam ◽  
Unit Cell ◽  
Ion Beam Modification ◽  
Cell Thickness

Higher Order Nonlinear Dielectric Microscopy

2001 ◽  
Vol 688 ◽  
Author(s):  
Yasuo Cho ◽  
Koya Ohara
Keyword(s):  
Depth Resolution ◽  
Higher Order ◽  
Ferroelectric Materials ◽  
Unit Cell ◽  
Dielectric Constants ◽  
Surface Layers ◽  
Nonlinear Dielectric ◽  
Microscopy Technique ◽  
Cell Thickness

AbstractA higher order nonlinear dielectric microscopy technique with higher lateral and depth resolution than conventional nonlinear dielectric imaging is investigated. The proposed technique involves the measurement of higher order nonlinear dielectric constants, with a depth resolution of down to 1.5 nm. The technique is demonstrated to be very useful for observing surface layers of the order of unit cell thickness on ferroelectric materials.

scholarly journals High-Tc superconductivity in ultrathin Bi2Sr2CaCu2O8+x down to half-unit-cell thickness by protection with graphene

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Da Jiang ◽  
Tao Hu ◽  
Lixing You ◽  
Qiao Li ◽  
Ang Li ◽  
...  
Keyword(s):  
Unit Cell ◽  
High Tc ◽  
High Tc Superconductivity ◽  
Cell Thickness

Strain Driven Two-Dimensional Phase Transition in PbSnF4 Superionic Conductor

1994 ◽  
Vol 369 ◽  
Author(s):  
Georges Denes ◽  
M.C. Madamba ◽  
J.M. Parris
Keyword(s):  
Phase Transition ◽  
Structural Change ◽  
Chemical Composition ◽  
Lead Nitrate ◽  
Unit Cell ◽  
Minor Amount ◽  
Two Dimensional ◽  
Detectable Change ◽  
A Minor ◽  
Nonuniform Strain

AbstractWhen a minor amount of HF is added to the SnF2 reacted with lead nitrate in aqueous solutions to prepare PbSnF4, a phase transition from tetragonal α-PbSnF4 to orthorhombíc o-PbSnF4 takes place. The transition is essentially bidimensional and takes place in the (a,b) plane of the unit-cell. The compactness of the structure increases at the transition. No essential structural change occurs: the transition is most likely displacive and it is driven by bidimensional nonuniform strain acting along the aand baxes of the unit-cell. This transition is similar to ferroic transitions (in this case, paraelastic → ferroelastic). No detectable change of chemical composition occurs at the transition, and the reason why the presence of HF in the reaction mixture causes the transition remains unknown.

Three isostructural solvates of a tetrahydrofurochromenone derivative

2017 ◽  
Vol 73 (5) ◽  
pp. 407-413 ◽  
Author(s):  
Balasubramanian Sridhar ◽  
Jagadeesh Babu Nanubolu ◽  
Krishnan Ravikumar ◽  
Govindaraju Karthik ◽  
Basi Venkata Subba Reddy
Keyword(s):  
Three Dimensional ◽  
Unit Cell ◽  
Multicomponent Systems ◽  
Two Dimensional ◽  
The Core ◽  
Cell Dimensions ◽  
Similarity Indices ◽  
Unit Cell Dimensions ◽  
Similar Unit ◽  
Crystal Packings

Isostructurality is more likely to occur in multicomponent systems. In this context, three closely related solvates were crystallized, namely, benzene (C27H21BrO6·C6H6), toluene (C27H21BrO6·C7H8) and xylene (C27H21BrO6·C8H10) with methyl 3a-acetyl-3-(4-bromophenyl)-4-oxo-1-phenyl-3,3a,4,9b-tetrahydro-1H-furo[3,4-c]chromene-1-carboxylate, and their crystal structures determined. All three structures belong to the same space group (P\overline{1}) and display similar unit-cell dimensions and conformations, as well as isostructural crystal packings. The isostructurality is confirmed by unit-cell and isostructural similarity indices. In each solvate, weak C—H...O and C—H...π interactions extend the molecules into two-dimensional networks, which are further linked by C—H...Br and Br...Br interactions into three-dimensional networks. The conformation of the core molecule is predominantly responsible for governing the isostructurality.

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