Abstract
Based on the observations of the cooperative E ⊗ ε Jahn-Teller effect (JTE) in compounds with the hexagonal perovskite structure (ABX3 2L compounds with an h-stacking) the occurrence and non-occurrence of helical structures as e.g. in CsCuCl3 and [N(CH3 )4]CuCl3 (TMCuCl3) are discussed. In particular the relative magnitude of the radii of Rb+ and Cs+ with respect to the radius of CI can explain the difference in structure of RbCuCl3 and CSCuCl3. This can be shown by comparing new neutron diffraction measurements of the acoustic phonon modes in CsFeCl3 with those previously determined for RbFeCl3. The acoustic phonon branches also demonstrate the phenomenon of structural resonance, which leads to energy lowering in cases of formation of helices. It is further shown that, in order to form a structural helix, displacements of ions related to ferro-electricity as well as to ferro-elasticity are necessary. The quadrupolar distortions resulting from the E ⊗ ε JTE are therefore complemented with dipolar shifts of layers perpendicular to the c-axis of the structure of CsCuCl3. The structure of CsCuBr3 is also shown to belong to this family of helices. It arises through distortion waves at the A-point in the first Brillouin zone and changes from an h-stacking to an hc-stacking of layers. Although a phase transition between the chloride and the bromide has not been observed, the deformation in CsCuBr3 reminds us of a Spin-Peierls transition. A new mechanism connected with ferromagnetic exchange along the columns of octahedra is proposed to explain the structure of β-RbCrCl3 and the low temperature structures (space group C2) of CsCrCl3 and RbCrCl3. The larger radius of Cs+ can explain why the β-RbCrCl3 structure does not occur for CSCrCl3. The structures having the C2 spacegroup resemble racemic dl-compounds. The question about the stability of the helix in β-CsCuCl3 remains difficult to answer without calculations. As experiment shows, other influences can easily disturb its formation. Probably because of the smaller radius of Cue+ with respect of Cr2+, the electrostatic energy stabilizes β-CsCuCl3 with respect to γ-CsCrCl3.
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Maaskant, W.J.A. (1995). On helices resulting from a cooperative Jahn-Teller effect in hexagonal perovskites. In: Iron-Sulfur Proteins Perovskites. Structure and Bonding, vol 83. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-59105-2_2
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DOI: https://doi.org/10.1007/3-540-59105-2_2
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