Determination of the Orientation Relations between the Low- and High-Temperature Phases of NiS

2010 ◽  
Vol 160 ◽  
pp. 177-182
Author(s):  
Heidrun Sowa ◽  
Helmut Klein ◽  
Lars Raue
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Imaging Plate ◽  
Transition Mechanism ◽  
Orientation Relations ◽  
Pole Figures ◽  
Main Component ◽  
Nias Type ◽  
Imaging Plate Detector

In order to get information about the transition mechanism, the temperature-induced transformation in the binary com¬pound NiS was investigated. Above 379 °C, a single crystal of millerite -NiS transforms to polycrystalline NiAs type -NiS with a sharp texture. Pole figures of both phases in the same orientation were measured using synchrotron radiation and an imaging plate detector. The Rietveld texture analysis showed that there are at least three components of the high-temperature -NiS phase. The main component shows the following orientation relations: [001]NiAs type  [001]millerite, [100]NiAs type  [210]millerite, [210]NiAs type  [100]millerite. The broad peaks of the recovered polycrystalline millerite occur at the same positions as the reflections of the original single crystal.

Revision of the Li–Si Phase Diagram: Discovery and Single-Crystal X-ray Structure Determination of the High-Temperature Phase Li4.11Si

2013 ◽  
Vol 25 (22) ◽  
pp. 4623-4632 ◽  
Author(s):  
Michael Zeilinger ◽  
Iryna M. Kurylyshyn ◽  
Ulrich Häussermann ◽  
Thomas F. Fässler
Keyword(s):  
Phase Diagram ◽  
High Temperature ◽  
Single Crystal ◽  
Structure Determination ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
X Ray

A high-temperature furnace for X-ray diffraction with directly machined α-Al2O3ceramic parts

1999 ◽  
Vol 32 (4) ◽  
pp. 833-836 ◽  
Author(s):  
Michael Estermann ◽  
Hans Reifler ◽  
Walter Steurer ◽  
Frank Filser ◽  
Peter Kocher ◽  
...  
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
Ceramic Materials ◽  
Imaging Plate ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Temperature Furnace ◽  
Sintering Shrinkage ◽  
Imaging Plate Detector ◽  
Temperature Furnace

A complex high-temperature furnace has been produced from presintered α-Al2O3precompacts. The furnace is designed for the Mar345 imaging-plate detector system. Up to now, the design complexity of ceramic parts has been limited by the difficulty of machining hard ceramic materials or by the moulds used in hot-pressing and casting. However, the machining of soft presintered ceramic materials enables the realisation of much more demanding designs, provided that the final sintering shrinkage of the ceramic is homogeneous and predictable. The design of the furnace and its realisation and application in an X-ray diffraction study with synchrotron radiation are presented.

HIGH-TEMPERATURE TENSILE STRENGTH DETERMINATION OF SINGLE CRYSTAL ALUMINA FIBERS

2014 ◽  
Vol 0 (4) ◽  
pp. 3-3 ◽  
Author(s):  
O.V. Basargin ◽  
◽  
T.M. Scheglova ◽  
V.J. Nikitina ◽  
V.I. Svistunov ◽  
...  
Keyword(s):  
Tensile Strength ◽  
High Temperature ◽  
Single Crystal ◽  
Strength Determination ◽  
Alumina Fibers ◽  
High Temperature Tensile

scholarly journals Texture Investigations on High Temperature Superconductors

1995 ◽  
Vol 24 (1-3) ◽  
pp. 93-103 ◽  
Author(s):  
Dietrich Schläfer ◽  
Klaus Fischer ◽  
Margitta Schubert ◽  
Brigitte Schlobach
Keyword(s):  
High Temperature ◽  
High Temperature Superconductors ◽  
Rotation Symmetry ◽  
Pole Figures ◽  
Composite Conductors ◽  
Current Densities ◽  
Powder In Tube ◽  
Thick Layers ◽  
Lotgering Factor

The formation of a structure with strong crystallographic texture is an important requirement for high critical current densities at 77 K in high temperature superconductive materials (HTSC). In this work several methods for texture investigation in the superconductive phase of BiPbSrCaCuO/Ag- and YBaCuO/AgPd-composite conductors prepared according to the “powder in tube”-method as well as in YBaCuO-thick layers are presented. For the characterisation of the texture development in dependence on technological steps at the preparation of HTSC-composite conductors the determination of the halfwidth FWHM from the psi-scan or for one-phase specimens the determination of the Lotgering-factor is appropriate, if only a c-axis exists. The measurement of pole figures is necessary to determine, whether a rotation symmetry occurs or an orientation of the (a,b)-directions exists. The use of the omega-scan to determine the half-width is not useful, if the goniometer unit is intended and optimised for phase analysis and therefore the secondary monochromator cannot be relinquished.

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