6533b7dbfe1ef96bd127153e
RESEARCH PRODUCT
Elastic constants in RbI, determined by inelastic neutron scattering
J. DaubertM. MüllnerAlois Loidlsubject
Physicsbusiness.industryResolution (electron density)Zero soundInelastic scatteringCondensed Matter PhysicsCurvatureSmall-angle neutron scatteringInelastic neutron scatteringElectronic Optical and Magnetic MaterialsOpticsDispersion (optics)NeutronAtomic physicsbusinessdescription
Long-wavelength acoustic phonons have been studied in the whole (100)-plane of RbI at 295 K by means of inelastic neutron scattering. The raw data have been corrected for resolution effects taking into account the curvature of the dispersion surface and variations of the mode eigenvectors. The shifts of the neutron groups due to these resolution effects are discussed in detail. The analysis of the experimental results gives for the zero sound elastic constantsc11=28.15±0.5,c12=3.7±0.5 andc44=2.85±0.1 1010 dyn/cm2. A comparison with first sound elastic constants taken from ultrasonic measurements yields significant differences between the high and low frequency elastic constantsc11 andc″=(c11−c12)/2. The differences calculated from recent theories are in agreement with the experimental results for the elastic constantsc11,c44 andc″, but not forc12. The dispersion surface in the (100)-plane is also shown for some out-of-symmetry data and compared with ultrasonic data as well as with theoretical results.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1978-09-01 | Zeitschrift f�r Physik B Condensed Matter and Quanta |