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861
Topochemical fluorination of some Ruddlesden-Popper phases
Published 2017“…The introduction of a cooperative octahedral tilt around the crystallographic z-axis leads to a local breaking of the inversion symmetry of the host lattice on fluorination, although the global inversion symmetry of the lattice is retained due to an alternation in the z-tilt direction in adjacent perovskite sheets.</p> <p>The substitution of Sr<sup>2+</sup> with Ca<sup>2+</sup> cations in YSr<sub>2</sub>Mn<sub>2</sub>O<sub>7</sub> led to an increasing distortion of the metal-oxide framework, resulting in the formation of an orthorhombic symmetry in space group <em>Pnnm</em> adopted by YSr<sub>0.5</sub>Ca<sub>1.5</sub>Mn<sub>2</sub>O<sub>7</sub>. …”
Thesis