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Thursday, October 15, 2020 | History

2 edition of neutron diffraction study of the 50 K phase transition in Pd-D. found in the catalog.

neutron diffraction study of the 50 K phase transition in Pd-D.

S.D Hanham

neutron diffraction study of the 50 K phase transition in Pd-D.

by S.D Hanham

  • 364 Want to read
  • 22 Currently reading

Published .
Written in English

    Subjects:
  • Physics Theses

  • Edition Notes

    Thesis (M.Sc), Dept. of Physics, University of Toronto

    ContributionsManchester, F. D. (supervisor)
    The Physical Object
    Pagination75 p.
    Number of Pages75
    ID Numbers
    Open LibraryOL19067385M

    A combined single crystal neutron/X-ray diffraction and solid-state nuclear magnetic resonance study of the hybrid perovskites CH 3 NH 3 PbX 3 (X = I, Br and Cl)† Tom Baikie,* a Nathan S. Barrow, b Yanan Fang, a Philip J. Keenan, c Peter R. Slater, c Ross O. Piltz, d Matthias Gutmann, e Subodh G. Mhaisalkar a and Tim J. White f.   The structure of Sr Ca TiO 3 has been studied using powder neutron diffraction and the Rietveld method in the temperature range 24– K. It is shown that new superlattice reflections characteristic of an antiferroelectric phase appear around T= K.

    We report a detailed single-crystal and powder neutron diffraction study of Co2TiO4 and Co2SnO4 between the temperature and 80 K to probe the spin structure in the ground state. The high-temperature phase behaviour of the ferroelectric layered perovskite Bi 4 Ti 3 O 12 has been re-examined by high-resolution powder neutron diffraction. Previous studies, both experimental and theoretical, had suggested conflicting structural models and phase transition sequences, exacerbated by the complex interplay of several competing structural instabilities.

      Neutron diffraction study on the structural phase transition in GeTe. T Chattopadhyay, J X Boucherle and H G The structural phase transition in GeTe has been investigated by neutron diffraction in the temperature range K. Accurate positional and thermal parameters have been obtained as a function of temperature both in the.   So recently our new paper, ‘A neutron diffraction study of the phase transition of fully deuterated triglycine sulphate (ND2CD2COOD)3.D2SO4’ .


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Neutron diffraction study of the 50 K phase transition in Pd-D by S.D Hanham Download PDF EPUB FB2

The antiperovskite Mn3ZnN is studied by neutron diffraction at temperatures between 50 and K. Mn3ZnN crystallizes to form a cubic structure at room temperature (C1 phase). Upon cooling, another cubic structure (C2 phase) appears at around K.

Interestingly, the C2 phase disappears below K. The maximum mass concentration of the C2 phase is approximately 85% (at K).Cited by:   The nuclear structure of Fe(dtc)2Cl, where dtc = diethyl-dithiocarbamate, is determined at several temperatures between 50 K and room temperature by high resolution powder neutron diffraction in a deuterated sample.

Thermodiffractograms reveal that a structural transition extends over the temperature region from to 75 K. In this structural transition one of the ethyl groups of Author: J.

Campo, J. Luzón, F. Palacio, G. DeFotis, J. Christophel, E. Ressouche. The structure of a polycrystalline sample of SrMoO 3 has been investigated using powder neutron diffraction from 5 to K, to reveal two structural phase transitions, the first from the cubic Pm 3 ¯ m structure with a=(3) Å to a tetragonal structure in I4/mcm near K and the second to an orthorhombic Imma phase below K.

The average Mo–O distance is essentially independent. Cmma at 2 K. Refinement of the neutron-diffraction pattern gave lattice parameters of a = 共 1 兲 Å, b = 共 1 兲 Å, and c = 共 2 兲 Å at 2 K. In the first, reported by Entin et al.

[10], a deuterium-loaded sample was used which had a concentration (D/Pd = ) corresponding to the mixed a + ß phase region [11]. On cooling below 50 K, this sample gave neutron diffraction peaks which these authors interpreted as being due to a change to a higher hydrogen concentration 69 with an.

Chapter 3 Modelling Residual Stress and Phase Transformations in Steel Welds 49 Hui Dai Chapter 4 Data Processing Steps in Neutron Diffraction: From the Raw Data to the Differential Cross Section 77 J. Dawidowski, G.J. Cuello and L.A. Rodríguez Palomino Chapter 5 Neutron Diffraction Studies of the Magnetic Oxide Materials Abstract.

Neutron powder diffraction studies on PdDt),fi demonstrate that the 50 K anomaly is due to an order-disorder transition of deuterium within octahedral interstitial sites. The slow transition to the ordered phase involves diffusion of deuterium from the nearest-neighbour deuterium positions to the second-"west-neighbour positions.

In summary, a neutron diffraction study has been performed on a PrCu 2 Ge 2 single crystal. The following results have been obtained: There are two magnetic transitions at T t =4 K and T N = K.

A simple antiferromagnetic structure with Q 1 =(0 0 1) and a Pr moment of μ B along the c-axis appears below T h the first-order transition at T t, the structure becomes one Cited by: 1. Neutron diffraction technique is applied to study in situ phase transitions in Fe at.% Ga.

• D0 3 → L1 2 → D0 19 → A2 transitions were recorded at instant heating in Fe at.% Ga. • The D0 3 → L1 2 transition generates internal stresses and results in an internal friction transient peak.

We report the first in situ variable temperature neutron powder diffraction (NPD) study of the solid-state ion conductor Li 3 PS 4 which delineates the transitions between its three polymorphs (γ → β → α) and determines their crystalline Li-sublattices.

They are compared to those of nanoporous β-Li 3 PS 4, and β′-type Si-substituted Li Si P S 4. Neutron diffraction methods for the study of residual stress fields. Advances in Physics: Vol.

34, No. 4, pp. Neutron powder diffraction has been used to examine the structural phase transitions in the perovskite-like NaTaO 3, from room temperature to room temperature orthorhombic structure (Pbnm, a = (1), b = (1), c = (2)) transforms to orthorhombic Cmcm at around K, then to tetragonal P4/mbm at K, and finally to cubic Pm m above K.

It has been shown previously that both hydrogen and deuterium in β phase Pd–H and Pd–D are situated in the octahedral interstices of the f.c.c. palladium lattice, but attempts to determine the atomic positions in the α phase proved inconclusive, since only small amounts of gas are contained in this phase.

The neutron diffraction and magnetic susceptibility studies have shown that the magnetic structure of UPd 2 Ge 2 changes dramatically even under very low iron doping.

Though the general magnetic structure of pure UPd 2 Ge 2 and of 1%Fe-doped samples is the same, the temperature intervals of existence of different magnetic phases are different.

The values of transition. of the landau theory of phase transitions chapter 4: phase transition in near stoichiometric iron sulfide 1 7 23 chapter 5: a ordering, incommensuration and phase transitions in pyrrhotite.

part i: a tem study of fe^sj chapter 6: ordering, incommensuration and phase transitions in pyrrhotite. part ii: a high-temperature x-ray powder diffraction. Elements of % purity were used. Chemical analysis showed atomic % Mn concentration.

The ingot was pulverized by filing, then annealed at oC for a week in evacuated quartz tube to produce the ordered phase. The neutron diffraction pattern obtained at 77oK showed reflections which can be indexed in a unit cell containing four atoms.

The kinetics of the ordering process in the first order phase transition of superionic Ag 3 SI was investigated by neutron diffraction. α-Ag 3 SI was quenched to certain temperatures of T c - Δ T, and the time dependence of integrated intensities and line widths of reflection were measured for various Δ T from 20 K to 75 K.

The time development scheme of the intensities can be. Neutron powder diffraction studies on PdD demonstrate that the 50 K anomaly is due to an order-disorder transition of deuterium within octahedral interstitial sites.

Structural phase transitions in highly concentrated hydrogen solid solutions ZrV2Dx (4 K. Phase transitions associated with hydrogen ordering in the lattice were found to occur in the concentration range For this material, the onset temperature on cooling for the tetragonal‐to‐orthorhombic transformation (determined by dilatometry) was K, and the reversion on subsequent heating occurred between and K.

Neutron diffraction patterns were recorded at temperatures down to 19 K then up to K, and analyzed by the multiphase Rietveld. Abstract. Neutron diffraction measurements of the equilibrium intensity of the (1 1/2 0) peak in the region of the low temperature transition for PdD x, x = and x = are accurate determination of the transition temperature and critical exponent are made, T c = ± K and γ = ± for x =Tc = ± K and γ = ± for x = Neutron powder diffraction has been used to examine the structural phase transitions in the perovskite-like NaTaO3, from room temperature to K.

The room temperature orthorhombic structure (Pbnm, a = (1), b = (1), c = (2)) transforms to orthorhombic Cmcm at around K, then to tetragonal P4/mbm at K, and finally to. The structures of sodium and potassium cyanide have been studied by neutron powder diffraction as a function of temperature between 6 and K.

Book Search tips Selecting this option will search all publications across the Scitation platform Selecting Neutron diffraction study of the structure and phase transitions of alkali cyanide.