A neutron diffraction study of the ferrimagnetic spinel
Neutron-diffraction experiments at 4.2K on a polycrystalline sample of the spinel NiCo 2 O 4 prepared at 320°C revealed 92 occupancy of the tetrahedral (A) sites by cobalt and Neel ferrimagnetism with mean A-site and B-site moments 〈μ A 〉 = 2.29(9)μ B and 〈μ B 〉 = −0.97(13)μ B.Diffuse scattering and electron microscopy demonstrated variations with position in the Ni/Co ratio.
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Characterisation of the residual stress state in a double
Neutron diffraction study of correlation between reinforcement size residual stress and microcracking in Alumina/SiCp composites Investigation of the reduction of NiAl2O4 using neutron powder diffraction. Üstündag E. / Hanan J.C. / Clausen B. / Bourke M.A.M. 2000. print version. 709 Investigation of the Reduction of NiAl 20 4 Using
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Neutron diffraction study of the electronic structure of
A. Pulsed Neutron Source 36 B. Time-of-flight Dif actometiy 39 C. Single Crystal Diffraction and Data Analysis 41 1. Experimental method 41 2. Data reduction 43 D. Powder Diffraction and Data Analysis 48 1. Experimental method 48 2. Data analysis — Rietveld refinement 51 IV. NEUTRON DIFFRACTION STUDY OF SrjCuOzClj 54 A. Crystal Structure 54
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Atomic Scale Mechanisms of the Reduction of Nickel
The reduction of a solid NiAl2O4 cylinder to a metal-ceramic composite consisting of Ni particles in an Al2O3 matrix was monitored in situ at 1220 °C with neutron powder diffraction.
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Neutron-diffraction study of the Jahn–Teller transition in
The stoichiometric perovskites RMnO 3 (R = rare earth) experience Jahn–Teller (JT) transitions as a function of temperature and R size similar to that recently described for LaMnO 3.We have investigated the JT transition for R = Pr by ATD techniques and neutron powder diffraction.This transition takes place at approximately 1050 K and it is characterized by a strong reduction of the MnO 6
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Selective Synthesis of Cyclooctanoids by Radical
The process is terminated by the quenching of a chiral benzylic samarium. A labeling experiment and neutron diffraction study have been used for the first time to probe the configuration and highly diastereoselective deuteration of a chiral organosamarium intermediate.
Chat OnlineHigh temperature neutron diffraction study of the Al2O3
Jan 01 2006 · Fig. 2 illustrates the reaction of the E1 composition from room temperature until 1900 °C.The main evolution in the diffraction pattern appears to be the gradual formation of YAG phase and the gradual reduction in the intensity of the Y 2 O 3 diffraction peaks with the progression of heating. The reaction of Al 2 O 3 and Y 2 O 3 to produce YAG is clearly evident from the new diffraction peaks.
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"In situ neutron diffraction study of the reduction of New
The reduction of New Zealand titanomagnetite ironsand in a dilute hydrogen-nitrogen gas mixture was studied in situ using neutron diffraction. Neutron diffraction allowed in situ observation of large samples during reduction at high temperatures. Australian hematite ore studied as a comparison reduced much more quickly than the pre-oxidised ironsand which in turn reduced more quickly than
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A neutron diffraction study of the ferrimagnetic spinel
Neutron-diffraction experiments at 4.2K on a polycrystalline sample of the spinel NiCo 2 O 4 prepared at 320°C revealed 92 occupancy of the tetrahedral (A) sites by cobalt and Neel ferrimagnetism with mean A-site and B-site moments 〈μ A 〉 = 2.29(9)μ B and 〈μ B 〉 = −0.97(13)μ B.Diffuse scattering and electron microscopy demonstrated variations with position in the Ni/Co ratio.
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Neutron diffraction study of the electronic structure of
A. Pulsed Neutron Source 36 B. Time-of-flight Dif actometiy 39 C. Single Crystal Diffraction and Data Analysis 41 1. Experimental method 41 2. Data reduction 43 D. Powder Diffraction and Data Analysis 48 1. Experimental method 48 2. Data analysis — Rietveld refinement 51 IV. NEUTRON DIFFRACTION STUDY OF SrjCuOzClj 54 A. Crystal Structure 54
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A neutron diffraction study of the ferrimagnetic spinel
Aug 01 1979 · Neutron-diffraction experiments at 4.2K on a polycrystalline sample of the spinel NiCo 2 O 4 prepared at 320°C revealed 92 occupancy of the tetrahedral (A) sites by cobalt and Neel ferrimagnetism with mean A-site and B-site moments 〈μ A 〉 = 2.29(9)μ B and 〈μ B 〉 = −0.97(13)μ B.Diffuse scattering and electron microscopy demonstrated variations with position in the Ni/Co ratio.
Chat OnlineIn situ neutron diffraction study of the reduction of New
Neutron diffraction allowed in situ observation of large samples during reduction at high temperatures. Australian hematite ore studied as a comparison reduced much more quickly than the pre-oxidised ironsand which in turn reduced more quickly than raw ironsand.
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A neutron diffraction study of the magnetic phases of
Neutron diffraction investigations have been performed to study the magnetization process of CsCuCl 3 with the magnetic field aligned within the ab-plane. In zero field the stacked triangular-lattice antiferromagnet (TLA) CsCuCl 3 has a helical structure incommensurate in the chain direction normal to the ab-plane. The magnetic phase diagram was investigated from 2 K up to TN in
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(PDF) The effect of pressure on the structure of NiAl2O4
In situ neutron diffraction studies performed by us indicate that this process is also occurring during the reduction of NiAl2O4 to Ni and Al2O3. It is possible that the compressive residual
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Neutron diffraction Applications of Neutron Scattering
The usefulness of neutron scattering arises from the properties of the neutron which is an uncharged particle of mass 1.00866 amu (almost the same as the hydrogen atom 1 H 1.00782) with a magnetic moment. Neutrons are scattered by the atomic nuclei of the sample and since the nucleus of an atom is only ∼0.1 of the diameter of the atom to a neutron most of a material is empty space.
Chat OnlineA neutron diffraction magnetic susceptibility and
A low-temperature powder neutron diffraction study of the antiferromagnetic phase of MnxCo1−xO. Journal of Solid State Chemistry 1988 72 (1) 42-51. DOI 10.1016/(88). Robin W Grimes Alfred B Anderson Arthur H Heuer.
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A neutron diffraction and Möss spectral study of the
Abstract. A neutron diffraction and Möss spectral study of Y 2 Fe 14-x Si x B shows that silicon preferentially occupies the 4c and to a lesser extent the 8j 1 sites in Y 2 Fe 14-x Si x B. The trend in the site occupancy is the same as in Nd 2 Fe 14-x Si x B. The Curie temperature of Y 2 Fe 14-x Si x B increases with increasing silicon content. Neutron diffraction data show that the
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In situ neutron diffraction study of the high-temperature
The chemical reduction of the K 2 NiF 4-type oxides Ln 2 Sr 2 CrNiO 8−δ (Ln = La Nd) and Nd 2.25 Sr 1.75 CrNiO 8−δ has been investigated in situ under a dynamic hydrogen atmosphere at high temperature using neutron powder diffraction.The high count-rate and high resolution of the D20 diffractometer at ILL Grenoble allowed real-time data collection and structure refinement by full
Chat OnlineEffect of NiAl2O4 Formation on Ni/Al2O3 Stability during
Aug 14 2015 · Abstract A series of alumina‐supported Ni catalysts were prepared to examine their activity and carbon deposition during dry reforming of methane (DRM). With an
Chat OnlineA neutron diffraction and Möss spectral study of the
A neutron diffraction and Möss spectral study of Y 2 Fe 14−x Si x B shows that silicon preferentially occupies the 4c and to a lesser extent the 8j 1 sites in Y 2 Fe 14−x Si x B. The trend in the site occupancy is the same as in Nd 2 Fe 14−x Si x B. The Curie temperature of Y 2 Fe 14−x Si x B increases with increasing silicon content. Neutron diffraction data show that the
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Neutron diffraction Applications of Neutron Scattering
The usefulness of neutron scattering arises from the properties of the neutron which is an uncharged particle of mass 1.00866 amu (almost the same as the hydrogen atom 1 H 1.00782) with a magnetic moment. Neutrons are scattered by the atomic nuclei of the sample and since the nucleus of an atom is only ∼0.1 of the diameter of the atom to a neutron most of a material is empty space.
Chat OnlineNeutron diffraction study of the Cr84.7Re15.3 alloy AIP
Section of neutron diffraction patterns recorded upon heating the Cr 84.7 Re 15.3 alloy. The reflection at 2 θ ≈ 49° is the (100) magnetic reflection of Cr. With increasing temperature to 590 K its intensity decreases in accordance with the suppression of the AF behaviour. The reflection at 2 θ ≈ 38° corresponds to the (012) magnetic
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In-situ Neutron Diffraction Studies of the Reduction of a
Due to the ease of in-situ measurements and the sensitivity to oxygen in the presence of heavy metals neutron diffraction is an ideal probe to study this reaction mechanism. We have developed a reaction cell that can be used in the General Purpose Powder Diffractometer at IPNS ANL for time resolved in situ study.
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Neutron diffraction studies towards deciphering the
Sep 01 2013 · 2.2. Room-temperature X-ray and neutron data collection and reduction Suitable H/D-exchanged crystals of KDN9PP were selected for both room-temperature X-ray and neutron data collection. Neutron diffraction quality and data-collection feasibility were determined using the Protein Crystallography Station at LANSCE.
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Neutron diffraction study of La2Ni04 3217 ceramic procedures) at a relatively low temperature (510 K) under a dry hydrogen atmosphere and careful monitoring of the reduction process by thermogravimetry. In the stoichiometric compound no Ni3 can be detected by titration techniques. We will concentrate on three different kind of samples
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Powder neutron diffraction study of the nasicon-related
The structures of Na-containing nasicon-type phases of the form Na x M II x M III 2 –x (SO 4) 3 –y (SeO 4) y (0 ⩽x⩽ 1.5 0 ⩽y⩽ 3) at 25 °C have been refined using powder neutron diffraction. The data are consistent with a rhombohedral structure similar to that of Na 1 x Zr 2 Si x P 3 –x O 12 but a reduction in symmetry (R compared to R c) results in a division of the
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Neutron diffraction study of the reduction of NiAl2O4
Neutron diffraction study of the reduction of NiAl2O4 E. Ustundaga) Department of Materials Science Keck Laboratory California Institute of Technology Pasadena California 91125 B. Clausen and M. A. M. Bourke Manuel Lujan Jr. Neutron Scattering Center Los Alamos National Laboratory Los
Chat OnlineNeutron diffraction study on the mechanism of the
Sep 01 1980 · The dynamic investigation by neutron diffraction of the topotactic reduction of 2H TaS 2 electrodes in K D 2 O electrolyte to the ionic layered hydrate K 0.5 (D 2 O) 0.5 TaS 2 0.5− is shown to proceed via third-stage K x (D 2 O) y TaS 2 3 x− second-stage K x (D 2 O) y TaS 2 2 x− and first-stage K x (D 2 O) y TaS 2 x− intermediates. A comparative study by X-ray
Chat OnlineIn situ neutron diffraction study of the reduction of New
In situ neutron diffraction study of the reduction of New Zealand ironsands in dilute hydrogen mixtures. Transactions of the Institutions of Mining and Metallurgy Section C Mineral Processing and Extractive Metallurgy 128 (3) .
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A neutron diffraction magnetic susceptibility and
A low-temperature powder neutron diffraction study of the antiferromagnetic phase of MnxCo1−xO. Journal of Solid State Chemistry 1988 72 (1) 42-51. DOI 10.1016/(88). Robin W Grimes Alfred B Anderson Arthur H Heuer.
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