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Weak Ferromagnetic Behavior of the Manganese Alkylphosphonate Hydrates MnCnH2n+1PO3 · H2O, n = 1-4

✍ Scribed by Simon G. Carling; Peter Day; Dick Visser; R.K. Kremer

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
286 KB
Volume
106
Category
Article
ISSN
0022-4596

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✦ Synopsis

Alkylphosphonates (\mathrm{MnC}{n} \mathrm{H}{2 n+1} \mathrm{PO}{3} \cdot \mathrm{H}{2} \mathrm{O}, n=1-4), were prepared from aqueous solution and studied using bulk magnetic techniques. Orthorhombic unit cell parameters have been determined from X-ray powder data. The compounds form a homologous series, apparently analogous to the inorganic phosphates (M^{\mathrm{l}} M^{\mathrm{I}} \mathrm{PO}{4} \cdot \mathrm{H}{2} \mathrm{O}), consisting of distorted (M \mathrm{O}{6}) octahedra cross-linked into sheets by phosphonate oxygens, the sheets being separated by alkyl chains. All four compounds are canted antiferromagnets, with ordering temperatures in the range 14.8-15.1 (\mathrm{K}). The magnitude of the spin canting varies significantly with the length of the alkyl chain; there is also an apparent alternation in (T{\mathrm{N}}) with odd and even chain lengths. 81993 Academic Press. Inc.

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