scholarly journals Analysis of Electronic Properties from Magnetotransport Measurements on Ba(Fe1−xNix)2As2 Thin Films

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 630
Author(s):  
Ilya Shipulin ◽  
Stefan Richter ◽  
Aleena Anna Thomas ◽  
Kornelius Nielsch ◽  
Ruben Hühne ◽  
...  
Keyword(s):  
Single Crystals ◽  
Measurement Data ◽  
X Ray Diffraction ◽  
Crystalline Perfection ◽  
Ni Doping ◽  
Ginzburg Landau ◽  
Electronic Parameters ◽  
Electronic Heat ◽  
Good Agreement

We performed a detailed structural, magnetotransport, and superconducting analysis of thin epitaxial Ba(Fe1−xNix)2As2 films with Ni doping of x = 0.05 and 0.08, as prepared by pulsed laser deposition. X-ray diffraction studies demonstrate the high crystalline perfection of the films, which have a similar quality to single crystals. Furthermore, magnetotransport measurements of the films were performed in magnetic fields up to 9 T. The results we used to estimate the density of electronic states at the Fermi level, the coefficient of electronic heat capacity, and other electronic parameters for this compound, in their dependence on the dopant concentration within the framework of the Ginzburg–Landau–Abrikosov–Gorkov theory. The comparison of the determined parameters with measurement data on comparable Ba(Fe1−xNix)2As2 single crystals shows good agreement, which confirms the high quality of the obtained films.

Study of the influence of dopants on the crystalline perfection of ferroelectric glycine phosphite single crystals using high-resolution X-ray diffraction analysis

2011 ◽  
Vol 44 (2) ◽  
pp. 313-318 ◽  
Author(s):  
Krishnamurthy Senthil Kumar ◽  
Sridharan Moorthy Babu ◽  
G. Bhagavannarayana
Keyword(s):  
High Resolution ◽  
Single Crystals ◽  
Point Defects ◽  
Room Temperature ◽  
Rare Earth Metals ◽  
X Ray Diffraction ◽  
Crystalline Perfection ◽  
X Ray ◽  
Tilt Boundaries

Good quality and optically transparent single crystals of pure and doped glycine phosphite (GPI) were grown by both solvent-evaporation and temperature-cooling techniques. Dopants were chosen in different categories, namely transition metals (Cr, Mn, Co, Ni, Zn, Mg, Cd), rare-earth metals (Ce, Nd, La), dyes (rhodamine B, malachite green, fluorescein) and an amino acid (L-proline). The concentration of dopants was chosen depending on the category of dopants and the quality of crystallization during the growth process. The crystalline perfection of the as-grown pure and doped GPI crystals was investigated by high-resolution X-ray diffraction at room temperature. A multicrystal X-ray diffractometer employing a well collimated and highly monochromated Mo Kα1beam and set in the (+, −, −, +) configuration was employed. Most of the crystal specimens show excellent crystalline perfection. However, grain boundaries, low-angle tilt boundaries, and vacancy and interstitial point defects were observed in some crystal specimens.

Characterization of Natural and Synthesized FeTiO3 Crystals With RBS/PIXE/XRD

1997 ◽  
Vol 07 (03n04) ◽  
pp. 265-275
Author(s):  
R. Q. Zhang ◽  
S. Yamamoto ◽  
Z. N. Dai ◽  
K. Narumi ◽  
A. Miyashita ◽  
...  
Keyword(s):  
Single Crystals ◽  
Ion Beam ◽  
Pressure Control ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
X Ray ◽  
Beam Analysis ◽  
Ppm Level

Natural FeTiO 3 (illuminate) and synthesized FeTiO 3, single crystals were characterized by Rutherford backscattering spectroscopy combined with channeling technique and particle-induced x-ray emission (RBS-C and PIXE). The results obtained by the ion beam analysis were supplemented by the x-ray diffraction analysis to identify the crystallographic phase. Oriented single crystals of synthesized FeTiO 3 were grown under the pressure control of CO 2 and H 2 mixture gas using a single-crystal floating zone technique. The crystal quality of synthesized FeTiO 3 single crystals could be improved by the thermal treatment but the exact pressure control is needed to avoid the precipitation of Fe 2 O 3 even during the annealing procedure. Natural FeTiO 3 contains several kinds of impurities such as Mn , Mg , Na and Si . The synthesized samples contain Al , Si and Na which are around 100 ppm level as impurities. The PBS-C results of the natural sample imply that Mn impurities occupy the Fe sublattice in FeTiO 3 or in mixed phase between ilmenite and hematite.

Solid state properties of poly-β-hydroxybutyrate and of its oligomers

1981 ◽  
Vol 59 (1) ◽  
pp. 38-44 ◽  
Author(s):  
R. H. Marchessault ◽  
Suzanne Coulombe ◽  
Hiromichi Morikawa ◽  
Keizo Okamura ◽  
J. F. Revol
Keyword(s):  
Molecular Weight ◽  
Solid State ◽  
Single Crystals ◽  
Small Angle ◽  
X Ray Diffraction ◽  
Melting Points ◽  
X Ray ◽  
Structure Factors ◽  
Electron Diffractograms ◽  
Good Agreement

The solid state properties of poly-β-hydroxybutyrate (PHB) were investigated for samples with degrees of polymerization [Formula: see text] from 4 to 994. The observed melting points ranged from 47 °C to 180 °C. Electron diffractograms on carefully prepared single crystals of a high molecular weight sample provided data which confirmed the reported a and b parameters from X-ray fiber diffraction and provided clear justification for the P212121 space group. The observed intensities in the electron diffractogram, corresponding to (hk0) reflections, were compared with the predicted intensities for two proposed structures in the literature. The observed and calculated structure factors for both structures were in good agreement. Small angle X-ray diffraction of the meridional maximum for annealed "cold drawn" and "hot drawn" fibers showed a distinctly different dependence on temperature than the maximum for stacks of lamellar single crystals. For oligomers a long spacing was observed which was about twice the length of the sample [Formula: see text] multiplied by the crystalline advance per monomer.

Theoretical and Experimental Study of the Diffraction Contrast on Magnetic Domain Walls

1982 ◽  
Vol 37 (5) ◽  
pp. 419-426 ◽  
Author(s):  
M. Polcarová ◽  
J. Brádler
Keyword(s):  
Experimental Study ◽  
Single Crystals ◽  
Domain Walls ◽  
Magnetic Domain ◽  
Dynamical Theory ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Domain Walls ◽  
Integrated Intensities ◽  
Good Agreement

Dynamical theory of the X-ray diffraction on a crystal containing misfit boundary was applied to the interpretation of the contrast observed in X-ray topographs on 90° magnetic domain walls in single crystals of an Fe-Si alloy. The integrated intensities were computed for several cases corresponding to the actual conditions of experiments. Good agreement of theoretical and experi­mental results was obtained.

PHOSPHATE TUNGSTEN BRONZES — A NEW FAMILY OF QUASI-LOW-DIMENSIONAL METALLIC OXIDES

1993 ◽  
Vol 07 (23n24) ◽  
pp. 3937-3971 ◽  
Author(s):  
MARTHA GREENBLATT
Keyword(s):  
Single Crystals ◽  
Density Wave ◽  
Measurement Data ◽  
X Ray Diffraction ◽  
New Class ◽  
Metallic Oxides ◽  
New Family ◽  
Oxide Bronzes ◽  
Low Dimensional ◽  
Low Dimensional Materials

A brief introduction is presented on transition metal oxide bronzes and their relationship to the phosphate tungsten bronzes; the latter compounds are the major focus of this review. The phosphate tungsten bronzes (PTB) are a new class of quasi-low-dimensional materials which exhibit charge density wave (CDW) instabilities. The growth of single crystals and investigation of the physical properties including the temperature dependence of the electrical resistivity and magnetic susceptibility on oriented single crystals are discussed for selected members of the major families in the PTB’s. Correlation of the physical measurement data with structural properties, X-ray diffraction data and results of the theoretical band structure calculations are also presented.

Single-crystal x-ray diffraction structures of covalent organic frameworks

Science ◽  
2018 ◽  
Vol 361 (6397) ◽  
pp. 48-52 ◽  
Author(s):  
Tianqiong Ma ◽  
Eugene A. Kapustin ◽  
Shawn X. Yin ◽  
Lin Liang ◽  
Zhengyang Zhou ◽  
...  
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Diffraction Data ◽  
General Procedure ◽  
Three Dimensional ◽  
Electron Diffraction Data ◽  
Covalent Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray

The crystallization problem is an outstanding challenge in the chemistry of porous covalent organic frameworks (COFs). Their structural characterization has been limited to modeling and solutions based on powder x-ray or electron diffraction data. Single crystals of COFs amenable to x-ray diffraction characterization have not been reported. Here, we developed a general procedure to grow large single crystals of three-dimensional imine-based COFs (COF-300, hydrated form of COF-300, COF-303, LZU-79, and LZU-111). The high quality of the crystals allowed collection of single-crystal x-ray diffraction data of up to 0.83-angstrom resolution, leading to unambiguous solution and precise anisotropic refinement. Characteristics such as degree of interpenetration, arrangement of water guests, the reversed imine connectivity, linker disorder, and uncommon topology were deciphered with atomic precision—aspects impossible to determine without single crystals.

scholarly journals Floating Zone Growth of Sr Substituted Han Purple: Ba0.9Sr0.1CuSi2O6

Crystals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 273
Author(s):  
Pascal Puphal ◽  
Stephan Allenspach ◽  
Christian Rüegg ◽  
Ekaterina Pomjakushina
Keyword(s):  
Magnetic Susceptibility ◽  
Single Crystals ◽  
Inelastic Neutron ◽  
Floating Zone ◽  
X Ray Diffraction ◽  
High Quality ◽  
Single Crystal Diffraction ◽  
X Ray ◽  
Zone Growth

We present a route to grow single crystals of Ba 0.9 Sr 0.1 CuSi 2 O 6 suitable for inelastic neutron studies via the floating zone technique. Neutron single crystal diffraction was utilized to check their bulk quality and orientation. Finally, the high quality of the grown crystals was proven by X-ray diffraction and magnetic susceptibility.

Enhancement of second harmonic generation, optical and dielectric properties inL-asparagine monohydrate single crystals due to an improvement in crystalline perfection by annealing

2010 ◽  
Vol 43 (3) ◽  
pp. 491-497 ◽  
Author(s):  
Mohd. Shakir ◽  
S. K. Kushawaha ◽  
K. K. Maurya ◽  
Sumeet Kumar ◽  
M. A. Wahab ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Second Harmonic Generation ◽  
Single Crystals ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
X Ray Diffraction ◽  
Crystalline Perfection ◽  
Second Harmonic Generation Efficiency ◽  
X Ray ◽  
Asparagine Monohydrate

Single crystals of the relatively new nonlinear optical material L-asparagine monohydrate have been successfully grown by the slow evaporation solution growth technique at room temperature in aqueous solution. The crystal system of the title material has been confirmed by powder X-ray diffraction. The crystalline perfection of the as-grown and annealed crystals has been evaluated by high-resolution X-ray diffraction. The as-grown single crystals (particularly when their size is large) were found to contain internal structural grain boundaries, and the crystalline perfection of these crystals was found to be improved substantially by annealing at low temperatures. The crystalline perfection and the measured physical properties were found to be correlated such that the second harmonic generation efficiency, optical transparency, fluorescence and dielectric properties are enhanced as the crystal quality improves.

scholarly journals Enhancement in crystalline perfection and optical properties of benzophenone single crystals: the remarkable effect of a liquid crystal

2011 ◽  
Vol 44 (4) ◽  
pp. 839-845 ◽  
Author(s):  
S. K. Kushwaha ◽  
N. Vijayan ◽  
K. K. Maurya ◽  
A. Kumar ◽  
B. Kumar ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Single Crystals ◽  
Crystalline Perfection ◽  
X Ray ◽  
Remarkable Effect ◽  
Bulk Single Crystals ◽  
Transparent Region ◽  
First Time

The remarkable enhancement of the crystalline perfection of benzophenone (BP) crystals induced by liquid crystal (LC) doping has been investigated, and has in turn led to better optical properties. High-resolution X-ray diffractometry demonstrates that the structural grain boundaries present in pure crystals can be eliminated when the crystal is grown with LC doping. Thus, the high alignment capability of LCs has for the first time been utilized to enhance the quality of BP bulk single crystals. The LC-doped crystal exhibits higher optical transparency over its entire transparent region. The optical polarizing behaviour of the doped BP crystal is also improved.

Effect of crucible design on crystalline perfection and the enhanced optical properties of benzimidazole single crystals grown by the vertical Bridgman technique

2013 ◽  
Vol 46 (1) ◽  
pp. 276-278 ◽  
Author(s):  
B. Riscob ◽  
N. Vijayan ◽  
Mohd Shakir ◽  
M. A. Wahab ◽  
G. Bhagavannarayana
Keyword(s):  
Optical Properties ◽  
Melting Point ◽  
High Resolution ◽  
Single Crystals ◽  
X Ray Diffraction ◽  
Crystalline Perfection ◽  
Bridgman Technique ◽  
X Ray ◽  
Vertical Bridgman ◽  
Double Wall

Good quality benzimidazole (BMZ) single crystals were successfully grown by the vertical Bridgman technique (VBT). The unavoidable thermal-induced structural grain boundaries formed in the normal VBT growth of these crystals with low melting point were controlled by using a double-wall ampoule. The grown single crystals were subjected to high-resolution X-ray diffraction to assess their crystallinity. The enhancement of optical properties due to the improvement in crystalline perfection is also reported.

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