Neutron Scattering - JUWEL - Forschungszentrum Jülich

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POWDER DIFFRACTOMETER SPODI 11 3. Information from powder diffraction experiments neutron counts 22000 20000 18000 16000 14000 12000 10000 8000 6000 4000 2000 0 -2000 20 30 40 50 60 70 80 2� [°] 90 100 110 120 130 Figure 6: on the left: typical powder diffraction pattern. On the right: zoom on a single Bragg peak. In the following, we will consider the information which can be derived from different elements of the diffraction patterns. Positions (scattering angles) of Bragg reflections � phase identification (from d-values) � lattice parameters � symmetry information (space group) by lattice parameters and selection rules (systematic extinction of reflections) Intensity of Bragg reflections experimental calculated Difference (exp - calc) Bragg positions � crystallographic structure � positions of atoms (fractional atomic coordinates) � occupancies of atoms on their sites � thermal displacement parameters � magnetic structure � magnetic lattice (propagation vector) � magnetic symmetry (space group) � magnetic moment per atom � quantitative phase analysis � preferred orientation effects neutron counts 25000 20000 15000 10000 5000 intensity width background 0 40.5 41.0 position 41.5 2� [°] 42.0 42.5
12 POWDER DIFFRACTOMETER SPODI Profiles of reflections The reflection profiles result in a convolution of the instrumental resolution function with broadening effects of the sample � microstructural information � microstrains � crystallite sizes Modulation/Profile of Background � short range order � disorder � amorphous contents
Page 1 and 2: Member of the Helmholtz Association
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Page 78 and 79: SPHERES Backscattering spectrometer
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SPHERES 5 Fig. 2: The monochromator
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SPHERES 7 While the primary spectro
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SPHERES 9 neutron is scattered, it
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SPHERES 11 The stationary equilibri
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SPHERES 13 4. Summarize the tempera
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________________________ DNS Neutro
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DNS 3 1 Introduction Polarized neut
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DNS 5 Monochromator horizontal- and
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DNS 7 3 Preparatory Exercises The p
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DNS 9 important and always necessar
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DNS 11 Contact �� Phone:
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________________________ KWS-3 Very
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KWS-3 3 1 Introduction Ultra small
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KWS-3 5 2. The standard Q-range of
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KWS-3 7 Table 2. Samples for practi
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KWS-3 9 References [1] Eskilden, M.
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________________________ RESEDA Res
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RESEDA 3 1 Introduction Neutrons ar
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RESEDA 5 various length values l ac
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RESEDA 7 In this expression, a norm
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RESEDA 9 spin flip from up to down
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RESEDA 11 The neutrons are counted
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RESEDA 13 Contact ��
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4 S. Mattauch and U. Rücker Fig. 2
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Neutron Scattering - JUWEL - Forschungszentrum Jülich

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