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N. Igawa
Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai 319-1195, Japan
Materials Science & Nanotechnology

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Force Constants of Cu Crystals from Diffuse Neutron Scattering Measurement T. Sakuma; S.R. Mohapatra; H. Uehara; R. Sakai; Xianglian Xianglian; H. Takahashi; N. Igawa; K. Basar
Atom Indonesia Vol 36, No 3 (2010): December 2010
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (145.615 KB) | DOI: 10.17146/aij.2010.28

Abstract

Diffuse neutron scattering measurement on Cu crystals was performed at 10 K and 300 K. Oscillatory forms were observed in the diffuse scattering intensities. The observed diffuse scattering intensities are analyzed by including the correlation effects among thermal displacements of atoms in the theory. Using the values of correlation effects among neighboring atoms and the values of Debye-Waller temperature parameter, force constants among first, second and third nearest neighboring atoms have been evaluated. The result of correlation effects in Cu crystals are compared to that of ionic crystal and semiconductor. The relation between correlation effects and the inter-atomic distance is not depending much on the crystal binding types. Received: 12 October 2010; Revised: 22 October 2010; Accepted: 16 December 2010
Derivation of Inter-Atomic Force Constants of Cu2O from Diffuse Neutron Scattering Measurement T. Makhsun; T. Sakuma; E. Kartini; R. Sakai; H. Takahashi; N. Igawa; S.A. Danilkin
Atom Indonesia Vol 39, No 1 (2013): April 2013
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/aij.2013.217

Abstract

Neutron scattering intensity from Cu2O compound has been measured at 10 K and 295 K with High Resolution Powder Diffractometer at JRR-3 JAEA. The oscillatory diffuse scattering related to correlations among thermal displacements of atoms was observed at 295 K. The correlation parameters were determined from the observed diffuse scattering intensity at 10 and 295 K. The force constants between the neighboring atoms in Cu2O were estimated from the correlation parameters and compared to those of Ag2O.Received: 16 January 2013; Revised: 10 April 2013; Accepted: 15 April 2013
Co-Authors E. Kartini H. Takahashi H. Uehara K. Basar R. Sakai S.A. Danilkin S.R. Mohapatra T. Makhsun T. Sakuma Xianglian Xianglian