Preparation, characterization, and magnetic properties of organic-intercalated two-dimensional ionic ferromagnets (C n H2n+ 1NH3)2CrCl4(n= 3, 5, or 12)
| Autor: | Martin J. Stead, Peter Day |
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| Rok vydání: | 1982 |
| Předmět: | |
| Zdroj: | Journal of the Chemical Society, Dalton Transactions. :1081 |
| ISSN: | 1364-5447 0300-9246 |
| DOI: | 10.1039/dt9820001081 |
| Popis: | The title compounds have been prepared and characterized by chemical analysis and powder X-ray diffraction. Spacing between the planes of chromium(II) ions increases from 12.35 to 17.81 to 31.05 A as n increases from 3 to 5 to 12 but the spacing between CrII within the planes remains almost constant. Magnetic susceptibility data in the range 60–140 K have been fitted to a high-temperature series expansion for a square two-dimensional lattice to give J= 6.5 ± 0.2 cm–1(ℋ=–JSiSj) and g= 1.95 for all three compounds. Low-temperature magnetization measurements show that all the salts order ferromagnetically in the region 50 ± 10 K although the transition is broadened by the applied magnetic field. The effective magnetic moments of 5.04–5.35 µB at 140 K remain higher than the spin-only value of 4.90 µB because of persisting short-range order. |
| Databáze: | OpenAIRE |
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