====== Octahedral engineering ======
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* Strong modulation between crystal symmetry and the corresponding RuO<sub>6</sub> octahedral configurations were verified by structural model calculations based on the diffraction data of 20 individual half-order peaks. This proves that the compressively strained SrRuO<sub>3</sub> thin film has pseudo-orthorhombic (monoclinic, P21/m, #11) structure with the BO<sub>6</sub> configuration of a<sup>+</sup>a<sup>–</sup>c<sup>–</sup> at 25 °C and tetragonal (I4/mcm, #140) with the octahedral tilt of a<sup>0</sup>a<sup>0</sup>c<sup>–</sup> above 285 °C. The structural phase transition from pseudo-orthorhombic to the tetragonal structure was determined at around 285 °C and epitaxial strain was persistent during the structural phase transition in the fully strained SrRuO<sub>3</sub>/SrTiO<sub>3</sub> heterostructured thin film.

[[https://link.springer.com/article/10.1007/s40042-023-00862-2]]