The specific heat of the colossal magnetoresistance material Nd 0.67 Sr 0.33 MnO 3 is reported for 0.35рT р280 K, Hϭ0 and 1рTр120 K, Hϭ9 T. The results include a Schottky-like specific-heat anomaly for the Nd ordering, an ''attenuation'' of the Mn ordering anomaly, and a T-dependent ''linear term,'' ␥(T)T. This unusual combination of features is interpreted as arising from an interaction between the Nd and Mn spin systems. The expected magnetic entropy is recovered only if a contribution from the ␥(T)T term is included.
Titanium tetramethoxide, empirical formula Ti(OCH3)4, crystallizes in the triclinic space group PT; a=9"09, b= 10.62, c= 10-62/~; e= 101.2, fl= 123.2, ~,= 102.1 ° and Din= 1-496 g.cm-3. The structure has been solved by three-dimensional Patterson and Fourier syntheses and shown to consist of discrete tetrameric molecules, Tia(OCH3)16. Least-squares refinement reduced R to 0.139 for data consisting of 1285 reflexions from room temperature Cu K~ Weissenberg photographs. The molecule consists of four titanium-oxygen octahedra surrounded by the terminal methyl groups, with methoxide oxygen bridges linking the titanium atoms. Titanium-oxygen bond lengths occur in several groups with their mean values ranging from 1.78 to 2.20/~. The standard deviations of the atomic positions are, for titanium 0.01, oxygen 0.02 and carbon 0"04/~ excepting two carbon atoms with larger standard deviations of 0.10/~ due to partial hydrolysis of their methoxide groups.
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