Phase Characterization and Grain Size Effects of Nanophase Y2O3, ZrO2 and Y2O3-ZrO2 Composites Produced by the Gas-Phase Condensation Technique

1992 ◽  
Vol 286 ◽  
Author(s):  
C. M. Foster ◽  
G. R. Bai ◽  
J. C. Parker ◽  
M. N. Ali
Keyword(s):  
Grain Size ◽  
Raman Scattering ◽  
Gas Phase ◽  
Size Effects ◽  
Structural Evolution ◽  
Deposition Process ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanophase Materials ◽  
Phase Characterization

ABSTRACTNanophase (n-) ZrO2 was produced in its pure and partially stabilized form by the gas-phase condensation method. The material was examined by x-ray diffraction and Raman scattering to obtain information on the structural evolution of the material during sintering. Two types of Y2O3 doped ZrO2 nanophase materials were made one by co-deposition of n-Y2O3 and n-ZrO2 in a consecutive manner and the second by mechanically mixing n-Y2O3 and n-ZrO2. We have determined that the co-deposition process is the most effect means of doping the n-ZrO2.

X-ray and micro-Raman analysis of nanophase ZrO2 and Y2O3–ZrO2 produced by the gas-phase condensation technique

1993 ◽  
Vol 8 (8) ◽  
pp. 1977-1982 ◽  
Author(s):  
C.M. Foster ◽  
G.R. Bai ◽  
J.C. Parker ◽  
M.N. Ali
Keyword(s):  
Raman Scattering ◽  
Gas Phase ◽  
Effective Means ◽  
Structural Evolution ◽  
Deposition Process ◽  
X Ray Diffraction ◽  
Raman Analysis ◽  
X Ray ◽  
Condensation Method

Nanophase (n-) ZrO2 was produced in its pure and partially stabilized form by the gas-phase condensation method. The material was examined by x-ray diffraction and Raman scattering to obtain information on the structural evolution of the material during sintering. Two types of Y2O3-doped ZrO2 nanophase material were made: one by co-deposition of n-Y2O3 and n-ZrO2 in a consecutive manner and the second by mechanically mixing n-Y2O3 and n-ZrO2. We have determined that the co-deposition process is the most effective means of doping the n-ZrO2.

Mechanical Properties of Porous Nanophase Materials Measured by Instrumental Indentation

1995 ◽  
Vol 400 ◽  
Author(s):  
H. Van Swygenhoven ◽  
W. Wagner ◽  
J. Löffler
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Annealing Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gas Condensation ◽  
Mean Grain Size ◽  
Nanophase Materials ◽  
The Mean ◽  
Instrumental Indentation

AbstractMechanical properties of nanostructured intermetallic Ni3Al synthesized by the inert-gas condensation technique are studied by means of instrumental indentation using the ICT-CSEMEX indenter. This instrument is a microindenter which continously measures load and displacement. Load-displacement curves are performed as function of grain size, consolidation- and annealing temperature. The mean grain size of the samples are studied by means of x-ray diffraction and small-angle neutron scattering.

Study of the early Stage of Deposition Process for Electrodeposited Ni100-XFeX Thin Films

2011 ◽  
Vol 495 ◽  
pp. 1-4 ◽  
Author(s):  
Saci Messaadi ◽  
Mosbah Daamouche ◽  
Abderrahim Guittoum ◽  
Hadria Medouer ◽  
Noureddine Fenineche ◽  
...  
Keyword(s):  
Experimental Data ◽  
Electrochemical Method ◽  
Early Stage ◽  
Structural Evolution ◽  
Deposition Process ◽  
Optimal Conditions ◽  
X Ray Diffraction ◽  
Nucleation Kinetics ◽  
Theoretical Methods ◽  
X Ray

The aim of this work is to understand the early stages in the growth mechanism of invar (Fe64Ni34) alloys and also to study the influence of potential on the evolution of their crystalline structures. Fe64Ni34 layers were deposited onto copper substrates under optimal conditions using the electrochemical method of cyclic voltammetry (CV) and chronoamperometry (CA). The influence of the potential is examined and the nucleation kinetics is discussed. In this purpose, the obtained experimental data was interpreted by applying useful theoretical methods developed by Scharifker and Hills. X-ray diffraction experiments were performed on all samples in order to follow the structural evolution of Fe64Ni34 layers as a function of the potential.

X-ray diffraction analyses of 3D MgO-based replicas of diatom microshells synthesized by a low-temperature gas/solid displacement reaction

2005 ◽  
Vol 20 (4) ◽  
pp. 306-310 ◽  
Author(s):  
M. S. Haluska ◽  
I. C. Dragomir ◽  
K. H. Sandhage ◽  
R. L. Snyder
Keyword(s):  
Grain Size ◽  
Low Temperature ◽  
Crystallite Size ◽  
Gas Phase ◽  
Grain Growth ◽  
Annealing Time ◽  
Displacement Reaction ◽  
X Ray Diffraction ◽  
Fourier Methods ◽  
X Ray

The nanostructural features of the gas-phase displacement reaction 2Mg(g)+SiO2→2MgO(s)+{Si}, where SiO2 is in the form of diatom shells were studied via X-ray diffraction and Fourier methods. Diatomaceous powder heated to 700 °C in a sealed graphite cell in the presence of Mg vapor formed MgO via a displacement reaction. Warren-Averbach analysis performed on samples reacted for different times showed an initial sharp MgO grain size distribution which broadened with time. New MgO crystallization was shown to occur until about 60 min, whereafter only MgO grain growth occurred. Median MgO crystallite size increased from 7.5 to 24.9 nm during this period, whereas microstrain decreased dramatically past 60 min annealing time.

Quantum Size Effects of Chemical Bath Deposited ZnSe Thin Films

2013 ◽  
Vol 652-654 ◽  
pp. 1743-1746
Author(s):  
Liang Yan Chen ◽  
Chao Fang
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Absorption Spectrum ◽  
Size Effects ◽  
Optical Band Gap ◽  
Quantum Size Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
Quantum Size ◽  
Znse Thin Films

Quantum dots ZnSe have been deposited through chemical bath deposition in thin films form. The nanoscal grain size of as-deposited and thermal treated ZnSe films have been investigated by X ray Diffraction. And optical band gap of those samples have been obtained from absorption spectrum. Both as-deposited and annealed films were with nanocryatlline grain smaller than the Bohr excitonic radius and showed blue shifts of bandgap in quantum size effects. The blue shifted optical bandgap versus grain size has been modeled theoretically.

STRUCTURAL EVOLUTION OF EXCEPTIONALLY IRON-DEFICIENT HEMATITE NANOCRYSTALS AS OBSERVED BY IN SITU SYNCHROTRON X-RAY DIFFRACTION

2019 ◽  
Author(s):  
Si Athena Chen ◽  
◽  
Peter Heaney ◽  
Jeffrey E. Post ◽  
Peter J. Eng ◽  
...  
Keyword(s):  
Structural Evolution ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Deficient

Insights into Microscopic Crystal Growth Dynamics of CH3NH3PbI3 under a Laser Deposition Process Revealed by In Situ X-ray Diffraction

2021 ◽  
Author(s):  
Tetsuhiko Miyadera ◽  
Yuto Auchi ◽  
Kohei Yamamoto ◽  
Noboru Ohashi ◽  
Tomoyuki Koganezawa ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Growth Dynamics ◽  
Deposition Process ◽  
Laser Deposition ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Preparation of high-entropy carbides by different sintering techniques

2021 ◽  
Vol 56 (19) ◽  
pp. 11237-11247 ◽  
Author(s):  
Johannes Pötschke ◽  
Manisha Dahal ◽  
Mathias Herrmann ◽  
Anne Vornberger ◽  
Björn Matthey ◽  
...  
Keyword(s):  
Grain Size ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Vacuum Sintering ◽  
X Ray ◽  
High Entropy ◽  
Mean Grain Size ◽  
The Mean ◽  
Gas Pressure Sintering ◽  
Hardness Values

AbstractDense (Hf, Ta, Nb, Ti, V)C- and (Ta, Nb, Ti, V, W)C-based high-entropy carbides (HEC) were produced by three different sintering techniques: gas pressure sintering/sinter–HIP at 1900 °C and 100 bar Ar, vacuum sintering at 2250 °C and 0.001 bar as well as SPS/FAST at 2000 °C and 60 MPa pressure. The relative density varied from 97.9 to 100%, with SPS producing 100% dense samples with both compositions. Grain size measurements showed that the substitution of Hf with W leads to an increase in the mean grain size of 5–10 times the size of the (Hf, Ta, Nb, Ti, V,)C samples. Vacuum-sintered samples showed uniform grain size distribution regardless of composition. EDS mapping revealed the formation of a solid solution with no intermetallic phases or element clustering. X-ray diffraction analysis showed the structure of mostly single-phase cubic high-entropy carbides. Hardness measurements revealed that (Hf, Ta, Nb, Ti, V)C samples possess higher hardness values than (Ta, Nb, Ti, V, W)C samples.

scholarly journals X-ray diffraction analysis of kaolin M1 and M2 via the Williamson–Hall and Warren–Averbach methods

2021 ◽  
pp. 174751982098472
Author(s):  
Lalmi Khier ◽  
Lakel Abdelghani ◽  
Belahssen Okba ◽  
Djamel Maouche ◽  
Lakel Said
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Low Temperature ◽  
Diffraction Analysis ◽  
Mechanical Resistance ◽  
X Ray Diffraction ◽  
Integral Breadth ◽  
X Ray ◽  
Mullite Phase

Kaolin M1 and M2 studied by X-ray diffraction focus on the mullite phase, which is the main phase present in both products. The Williamson–Hall and Warren–Averbach methods for determining the crystallite size and microstrains of integral breadth β are calculated by the FullProf program. The integral breadth ( β) is a mixture resulting from the microstrains and size effect, so this should be taken into account during the calculation. The Williamson–Hall chart determines whether the sample is affected by grain size or microstrain. It appears very clearly that the principal phase of the various sintered kaolins, mullite, is free from internal microstrains. It is the case of the mixtures fritted at low temperature (1200 °C) during 1 h and also the case of the mixtures of the type chamotte cooks with 1350 °C during very long times (several weeks). This result is very significant as it gives an element of explanation to a very significant quality of mullite: its mechanical resistance during uses at high temperature remains.

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