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- W2042999238 abstract "The structure of RbFeCl3 at atmospheric pressure contains hexagonal close-packed RbCl3 layers with Fe filling all the chlorine octahedra, which form continuous face-shared chains. RbFeCl3 transforms at 700°C and 20–35 kbar to the RbNiF3 structure, which has two cubic-stacked for every hexagonal-stacked RbCl3 layer to give face-shared pairs of octahedra joined by octahedra sharing only corners. The high-pressure phase is retained under ambient conditions and is ferrimagnetic with Tc = 109°K. Above 225°K, the susceptibility obeys the Curie-Weiss law with CM = 3.89 emu°K/mole (μeff = 5.58 μB) and θp = −134°K. The powder samples do not saturate at 4.2°K in fields up to 17.2 kOe. The saturation magnetization calculated from a 1/H vs M plot is 1.1 μB (25.4 emu/g), which approaches the theoretical value of 1.3 μB predicted for ferromagnetic pairs of iron-filled octahedra coupled antiferromagnetically to a third octahedra, as is found in RbNiF3 and CsFeF3. Optical transmission data on the tan powdered samples pressed in KBr show transparency from 0.3 to 24 μ with some absorption bands between 0.3 and 0.6 μ. The change in Tc with hydrostatic pressure is linear to 8 kbar (dTc/dP = 2.13±0.05°K/kbar). This is about four times larger than that found for the isostructural ferrimagnetic fluorides, reflecting the higher compressibility of the chloride anion." @default.
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- W2042999238 date "1971-03-15" @default.
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- W2042999238 title "High‐Pressure RbFeCl<sub>3</sub>‐A Transparent Ferrimagnet" @default.
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- W2042999238 doi "https://doi.org/10.1063/1.1660342" @default.
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