TY  - JOUR
AU  - Yin, Xiaoyan
AU  - Beez, Alexander
AU  - Menzler, Norbert H.
AU  - Spatschek, Robert
TI  - Combined experimental and ab initio based determination of the thermal expansion of La0.5Sr0.5Co0.25Fe0.75O3
JO  - Journal of the American Ceramic Society
VL  - 101
IS  - 7
SN  - 0002-7820
CY  - Oxford [u.a.]
PB  - Wiley-Blackwell
M1  - FZJ-2018-02570
SP  - 3086-3093
PY  - 2018
AB  - The thermal expansion of La0.5Sr0.5Co0.25Fe0.75O3 (LSCF55) is investigated both by first principles phonon calculations combined with the quasi‐harmonic approximation (QHA) and by experimental approaches. Within the framework of the QHA, the volumetric thermal expansion coefficient of rhombohedral LSCF55 is calculated as αV,GGA = 50.34 × 10−6 K−1. For comparison, the lattice expansion and the volume expansion of LSCF55 grain are measured by in situ high‐temperature X‐ray diffractometer (HT‐XRD). An anisotropic thermal expansion of rhombohedral LSCF55 with αa,hex = 10.89 × 10−6 K−1 and αc,hex = 21.18 × 10−6 K−1 is obtained. The volumetric thermal expansion coefficient is measured as αV,HT‐XRD = 43.17 × 10−6 K−1. In addition, the effectively isotropic expansion coefficients of a polycrystalline LSCF55 bar specimen are measured using a vertical high‐performance thermo‐mechanical analyzer and yield αl,bar specimen = 17.37 × 10−6 K−1 and αV,bar specimen = 52.11 × 10−6 K−1.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000431661300043
DO  - DOI:10.1111/jace.15430
UR  - https://juser.fz-juelich.de/record/845292
ER  -