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- Title
Low‐temperature phase transition and magnetic properties of K<sub>3</sub>YbSi<sub>2</sub>O<sub>7</sub>.
- Authors
Dabić, Predrag; Kahlenberg, Volker; Krüger, Biljana; Rodić, Marko; Kovač, Sabina; Blanuša, Jovan; Jagličić, Zvonko; Karanović, Ljiljana; Petříček, Václav; Kremenović, Aleksandar
- Abstract
The new ambient‐temperature hexagonal (space group P63/mmc) polymorph of tripotassium ytterbium(III) disilicate (β‐K3YbSi2O7) has been synthesized by the high‐temperature flux method and subsequently structurally characterized. In the course of the temperature‐dependent single‐crystal diffraction experiments, a phase transformation of β‐K3YbSi2O7 to a novel low‐temperature orthorhombic phase (β′‐K3YbSi2O7, space group Cmcm) has been observed at about 210 K. β‐K3YbSi2O7 is isostructural with K3ErSi2O7, whereas β′‐K3YbSi2O7 adopts a new type of structure. Both compounds can be built up from a regular alternation of layers of two types, which are parallel to the (001) plane. In the octahedral layer, YbO6 octahedra are isolated and linked by K1O6+3 polyhedra. The second, slightly thicker sorosilicate layer is formed by a combination of Si2O7 dimers and K2O6+3 polyhedra. The boundary between the layers is a pseudo‐kagome oxide sheet based on 3.6.3.6 meshes. The phase transition is due to a tilt of the two SiO4 tetrahedra forming a single dimer which induces a decrease of the Si—O—Si angle between bridging Si—O bonds from 180° (dictated by symmetry in space group P63/mmc) to ≃164°. Magnetic characterization indicates that K3YbSi2O7 remains paramagnetic down to 2 K, showing no apparent influence of the phase transformation on its magnetic properties. Analysis of the magnetization data revealed the positions of the three lowest crystal field levels of the Yb3+ cations, as well as the corresponding projections of their angular momentum on the direction of the magnetic field.
- Subjects
MAGNETIC transitions; MAGNETIC properties; SPACE groups; SYMMETRY groups; PHASE transitions
- Publication
Acta Crystallographica Section B: Structural Science, Crystal Engineering & Materials, 2021, Vol 77, Issue 4, p584
- ISSN
2052-5192
- Publication type
Article
- DOI
10.1107/S2052520621006077