| Abstrakt: |
Reaction of anhydrous binary fluorides LiF and InF3in sealed platinum tube at the temperature gradient 680/670°C yields α-Li3InF6. This low-temperature form crystallizes in the space group P21/mwith the cell dimensions a= 4.797(3) Å, b= 8.679(1) Å, c= 10.366(1) Å and β = 90.90(1)°. The framework is built from InF6and LiF6octahedra, beside [Li2F6] bitetrahedra. The b-axis seems to be the backbone in the structural features. Running along it, zigzag anionic chains $$({\rm LiF}_4 )_n^{3n - }$$, resulting from one—edge shared [Li2F10] groups and double files of single InF6octahedra sharing common corners with [Li2F6], create an approximately hexagonally packed framework in the plane (1 0 0). The antiferroelectric behaviour evident from dielectric studies is confirmed by the antiparallel displacements of In and Li atoms from octahedral centres.Reaction of anhydrous binary fluorides LiF and InF3in sealed platinum tube at the temperature gradient 680/670°C yields α-Li3InF6. This low-temperature form crystallizes in the space group P21/mwith the cell dimensions a= 4.797(3) Å, b= 8.679(1) Å, c= 10.366(1) Å and β = 90.90(1)°. The framework is built from InF6and LiF6octahedra, beside [Li2F6] bitetrahedra. The b-axis seems to be the backbone in the structural features. Running along it, zigzag anionic chains $$({\rm LiF}_4 )_n^{3n - }$$, resulting from one—edge shared [Li2F10] groups and double files of single InF6octahedra sharing common corners with [Li2F6], create an approximately hexagonally packed framework in the plane (1 0 0). The antiferroelectric behaviour evident from dielectric studies is confirmed by the antiparallel displacements of In and Li atoms from octahedral centres. |
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