Thermal expansion of CaIrO3 post-perovskite determined by time-of-flight measurements

6th Meeting of the Spanish Neutron Scattering Association

Aguado, F.^1 ; Hirai, S.^2 ; Redfern, S.A.T.^3 ; Smith, R.I.^4

MALTA-Consolider Team, Unidad Asociada ICMA-CSIC, Universidad de Cantabria, Cantabria

39005, Spain^1

Department of Geological and Environmental Sciences, Stanford University, Stanford

CA

94305-2115, United States^2

Department of Earth Sciences, University of Cambridge, Cambridge

CB2 3EQ, United Kingdom^3

Rutherford Appleton Lab, ISIS Facility, Didcot

OX11 0QX, United Kingdom^4

关键词: Isotropic evolution;    Linear expansions;    Post-perovskite structure;    Structural differences;    Time of flight measurements;    Wide temperature ranges;    X-Ray and neutron diffraction;    X-ray diffraction studies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/549/1/012024/pdf
DOI  :  10.1088/1742-6596/549/1/012024

来源: IOP

【 摘 要 】

The thermal evolution of the CaIrO3post-perovskite structure has been determined by neutron powder diffraction (time-of-flight) measurements in a wide temperature range, from 1.8K to 550K. The linear expansion is similar to that found in previous x-ray diffraction studies, being αb> αc> αa,. However, the difference in relative lattice parameters is less pronounced in the present case, suggesting a more isotropic evolution under temperature. Other structural differences found at low and high temperatures through several X-ray and neutron diffraction studies have been also analysed.