Investigation of the magnetism of Cu 3 Mo 2 O 9 single crystal, which has antiferromagnetic ͑AF͒ linear chains interacting with AF dimers, reveals an AF second-order phase transition at T N = 7.9 K. Although weakferromagnetic-like behavior appears at lower temperatures in low magnetic fields, complete remanent magnetization cannot be detected down to 0.5 K. However, a jump is observed in the magnetization below weakferromagnetic ͑WF͒ phase transition at T c Ӎ 2.5 K when a tiny magnetic field along the a axis is reversed, suggesting that the coercive force is very weak. A component of magnetic moment parallel to the chain forms AF long-range order ͑LRO͒ below T N , while a perpendicular component is disordered above T c at zero magnetic field and forms WF-LRO below T c . Moreover, the WF-LRO is also realized by applying magnetic fields even between T c and T N . These results are explainable by both magnetic frustration among symmetric exchange interactions and competition between symmetric and asymmetric Dzyaloshinskii-Moriya exchange interactions.

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The thermal decomposition rate of N 2 O 5 in 760 Torr of air as a function of temperature between 314 and 348 K has been investigated using the technique of pulsed laser cavity ring-down spectroscopy (CRDS) detection of NO 3 radicals at 662 nm. The Arrhenius expression of the thermal decomposition rates determined by the CRDS experiments, which is incorporated with literature values down to 263 K, is given by 1.36 × 10 15 exp{(−11300 ± 200)/T} s −1 over the temperature range 263-348 K. C 2008 Wiley Periodicals, Inc. Int J Chem

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