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The crystal and magnetic structures of K2FeCl5.D2O and Rb2FeCl5/D2O have been determined by neutron powder diffraction. The crystal structure of K2FeCl5.D2O has been redetermined using single-crystal diffraction. All compounds crystallize with the orthorhombic space group Pnma. The magnetic structure of both deuterated compounds can be described by ferromagnetic planes perpendicular to the b axis coupled antiferromagnetically to each other. The critical behaviour of the staggered magnetization below TN=14.2 K and 10.0 K for K2FeCl5.D2O and Rb2FeCl5.D2O, respectively, can be described by a power law for reduced temperature 0.03

Critical exponents of magnetization p below TN in the weakly ferromagnetic layer compounds MnGH%+IFQ.H20 have been measured by SQUm magnetometly for n = 2-4. In all three compounds crossovers a~ observed in p as follows @I, &): 0.21(2), 0.73(2) (n = 2); o.Ia(l), 0.42(6) (n = 3 , o.ia(i), -0.6 (n = 4). The crossover o c m at values of the reduced temperature t = (TN -T ) / T N that become smaller as the separation between the magnetic layers increases.

Context. Essential for adequate management of breakthrough cancer pain is a combination of accurate (re-)assessment and a personalized treatment plan. The Breakthrough Pain Assessment Tool (BAT) has been proven to be a brief, multidimensional, reliable, and valid questionnaire for the assessment of breakthrough cancer pain.Objectives. The aim of this study was to examine the validity and reliability of the Dutch Language version of the BAT (BAT-DL) in patients with cancer.Methods. The BAT was forward-backward translated into the Dutch language. Thereafter, the psychometric properties of the BAT-DL were tested, that is factor structure, reliability (internal consistency and test-retest reliability), validity (content validity and construct validity), and the responsiveness to change.Results. The BAT-DL confirmed the two-factor structure in 170 patients with cancer: pain severity/impact factor and pain duration/medication efficacy factor. The Cronbach's alpha coefficient was 0.72, and the intraclass correlation for the testretest reliability was 0.81. The BAT-DL showed to be able to differentiate between different group of patients and correlated significantly with the Brief Pain Inventory. In addition, the BAT-DL was capable to detect clinically important changes over time.Conclusion. The BAT-DL is a valid and reliable questionnaire to assess breakthrough pain in Dutch patients with cancer and is a relevant questionnaire for daily practice.

Elastic and quasielastic neutron scattering measurements have been performed in the S=1/2 square Heisenberg antiferromagnet copper(II) deuteroformate tetradeuterate, Cu(DCO2)2.4D2O. The sublattice magnetization was measured below TN=16.54(5) K, and the critical exponent beta was found to cross over from 0.23(1) to 0.32(2) at a reduced temperature epsilon =(TN-T)/TN of 0.06 as TN was approached from below. The temperature dependence of the inverse correlation length of the two-dimensional antiferromagnetic correlations and of the sublattice susceptibility above TN was consistent with the predictions of the quantum non-linear sigma model of Chakravarty (1989) and co-workers for a spin-wave stiffness of 13.4(4) K.