High-resolution powder diffractometer HRPT for thermal neutrons at SINQ

Fischer, Peter; Frey, Gianni; Koch, M.; Könnecke, Mark; Pomjakushin, Vladimir; Schefer, J.; Thut, R.; Schlumpf, N.; Bürge, Roman; Greuter, U.; Bondt, S; Berruyer, E.

doi:10.1016/s0921-4526(99)01399-x

Cited by 364 publications

(274 citation statements)

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“…The structures were verified by combined neutron and x-ray diffraction experiments, which were carried out on HRPT [35] at SINQ, PSI and the Materials Science Beamline (MSB) [36] at the SLS, PSI. Rietveld refinement of the structures (results tabulated in Appendix A) as implemented in the FULLPROF [37] software proved all samples to be of high quality and single phase.…”

Section: A Neutron Scattering (Powders)mentioning

confidence: 94%

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
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We present a model of the lattice dynamics of the rare-earth titanate pyrochlores R 2 Ti 2 O 7 (R = Tb, Dy, Ho), which are important materials in the study of frustrated magnetism. The phonon modes are obtained by density functional calculations, and these predictions are verified by comparison with scattering experiments. Single crystal inelastic neutron scattering is used to measure acoustic phonons along high symmetry directions for R = Tb, Ho; single crystal inelastic x-ray scattering is used to measure numerous optical modes throughout the Brillouin zone for R = Ho; and powder inelastic neutron scattering is used to estimate the phonon density of states for R = Tb, Dy, Ho. Good agreement between the calculations and all measurements is obtained, allowing confident assignment of the energies and symmetries of the phonons in these materials under ambient conditions. Knowledge of the phonon spectrum is important for understanding spin-lattice interactions, and can be expected to be transferred readily to other members of the series to guide the search for unconventional magnetic excitations.

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Section: A Neutron Scattering (Powders)mentioning

confidence: 94%

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
View full text Add to dashboard Cite

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“…The neutron powder diffraction (NPD) data were recorded using the high resolution powder diffractometer for thermal neutrons (HRPT) [40] located at the Swiss Spallation Neutron Source (SINQ) of the Paul Scherrer Institut in Switzerland. Samples were placed in cylindrical vanadium cans of 8 mm diameter.…”

Section: Methodsmentioning

confidence: 99%

Synthesis, Crystal Structure and Optical Properties of LaNbON₂

Logvinovich

Ebbinghaus

Reller

et al. 2010

Zeitschrift anorg allge chemie

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Abstract. LaNbON 2 was synthesized by thermal ammonolysis of crystalline LaNbO 4 prepared by a soft chemistry approach. LaNbON 2 crystallizes in a distorted GdFeO 3 -like perovskite structure with space group Pnma and a = 5.5720(2), b = 7.8656(4), c = 5.6066(3) Å and a random anionic arrangement as revealed by neutron diffraction. Elongated displacement ellipsoids found by neutron diffraction and a con-

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“…Neutron diffraction was performed at room temperature for the alloy TiFe 2 Al annealed at 900°C in high intensity mode (Dd/d ‡ 2910 -3 ) and on heating in the temperature range 27 £ T £ 1277°C (300 £ T £ 1550 K; heating rate: 5°C/min and dwell time for diffraction run at isothermal temperature: 180 min) on the high-resolution HRPT diffractometer [42] at the SINQ spallation source of Paul Scherrer Institute, Switzerland. To reduce preferential orientation effects, the alloy was powdered to a grain size below 60 lm.…”

Section: Methodsmentioning

confidence: 99%

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

Yan

Grytsiv

Rogl

et al. 2008

J Phs Eqil and Diff

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Alloys with composition Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50) were investigated employing electron probe microanalysis (EPMA) and X-ray powder diffraction (XPD). For TiFe 2 Al, in situ neutron powder diffraction (ND) was used for the inspection of phase constitution covering the temperature range from 27°C (300 K) to 1277°C (1550 K). Combined Rietveld refinement of ND and XPD data for TiFe 2 Al revealed that Fe atoms occupy the 8c site in space group Fm " 3m; Ti with a small amount of Al sharing the 4a site, and the remaining Ti and Al atoms adopting the 4b site. This structural model was successfully applied in the refinement of all alloys Ti 25 (Fe 50 2 x Ni x )Al 25 (0 £ x £ 50). Partial atom order exists on the Fe-rich side while complete order is observed for the Ni-rich side. Profiles recorded by in situ neutron powder diffraction for TiFe 2 Al in the range of investigated temperatures show two phases, namely Heusler phase and MgZn 2 -type Laves phase. Diffraction peaks from the Heusler phase dominate the profiles at lower temperatures but at higher temperatures the MgZn 2 -type Laves phase is the main phase. No CsCl-type phase was found in the alloy in the investigated temperature range. The thermal expansion coefficient of TiFe 2 Al is 1.4552310 25 K 21 .

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High-resolution powder diffractometer HRPT for thermal neutrons at SINQ

Cited by 364 publications

References 0 publications

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
View full text Add to dashboard Cite

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
View full text Add to dashboard Cite

Synthesis, Crystal Structure and Optical Properties of LaNbON₂

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

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High-resolution powder diffractometer HRPT for thermal neutrons at SINQ

Cited by 364 publications

References 0 publications

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=Ruminy1, Valdez2, Wehinger3 et al. 2016Phys. Rev. B336480View full textAdd to dashboardCite

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=Ruminy1, Valdez2, Wehinger3 et al. 2016Phys. Rev. B336480View full textAdd to dashboardCite

Synthesis, Crystal Structure and Optical Properties of LaNbON2

The Heusler Phase Ti25(Fe50 − x Ni x )Al25 (0 ≤ x ≤ 50); Structure and Constitution

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About

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
View full text Add to dashboard Cite

First-principles calculation and experimental investigation of lattice dynamics in the rare-earth pyrochloresR2Ti2O7(R=
Ruminy
¹
,
Valdez
²
,
Wehinger
³

et al. 2016
Phys. Rev. B
33
6
48
0
View full text Add to dashboard Cite

Synthesis, Crystal Structure and Optical Properties of LaNbON₂