TY - JOUR
T1 - Long-range and local crystal structures of the S r1-x C axRu O3 perovskites
AU - Nguyen, Loi T.
AU - Abeykoon, Milinda
AU - Tao, Jing
AU - Lapidus, Saul
AU - Cava, R. J.
PY - 2020/3
Y1 - 2020/3
N2 - The crystal structures of the Sr1-xCaxRuO3(0≤x≤1) perovskites are investigated using both long-range and local structural probes. High-resolution synchrotron powder X-ray-diffraction characterization at ambient temperature shows that the materials have orthorhombic long-range crystal structures to high precision, and we support previous work showing that Ca2+ substitution for Sr2+ primarily changes the tilting of rigid corner-sharing RuO6 octahedra at their shared oxygen vertices. X-ray pair-distribution function analysis for SrRuO3,CaRuO3, and one intermediate composition show them to display monoclinic symmetry at the local level; when averaged over different domain orientations this yields orthorhombic symmetry in the long range, and no long-range or local phase transitions are observed between 80 and 300 K for materials with intermediate compositions. High-resolution transmission electron microscopy shows that the Sr/Ca distribution is random at the nanoscale. We plot magnetic characteristics such as the ferromagnetic Tc, Curie-Weiss theta, effective moment, and ambient temperature susceptibility vs the octahedral tilt and unit-cell volume.
AB - The crystal structures of the Sr1-xCaxRuO3(0≤x≤1) perovskites are investigated using both long-range and local structural probes. High-resolution synchrotron powder X-ray-diffraction characterization at ambient temperature shows that the materials have orthorhombic long-range crystal structures to high precision, and we support previous work showing that Ca2+ substitution for Sr2+ primarily changes the tilting of rigid corner-sharing RuO6 octahedra at their shared oxygen vertices. X-ray pair-distribution function analysis for SrRuO3,CaRuO3, and one intermediate composition show them to display monoclinic symmetry at the local level; when averaged over different domain orientations this yields orthorhombic symmetry in the long range, and no long-range or local phase transitions are observed between 80 and 300 K for materials with intermediate compositions. High-resolution transmission electron microscopy shows that the Sr/Ca distribution is random at the nanoscale. We plot magnetic characteristics such as the ferromagnetic Tc, Curie-Weiss theta, effective moment, and ambient temperature susceptibility vs the octahedral tilt and unit-cell volume.
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U2 - 10.1103/PhysRevMaterials.4.034407
DO - 10.1103/PhysRevMaterials.4.034407
M3 - Article
AN - SCOPUS:85083332731
VL - 4
JO - Physical Review Materials
JF - Physical Review Materials
SN - 2475-9953
IS - 3
M1 - 034407
ER -