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Determination of the crystal polarity of non‐centrosymmetric crystals by comparison of the intensities of Friedel‐related pairs of reflections from planes inclined to an extended crystal face is described. Measurements on cubic ZnS are used to illustrate the method. The general case of absorption for a reflection from planes inclined to an extended crystal face is discussed.

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A mixed-polytype crystal of AgI is studied by X-ray diffraction. The constituent polytypes are found to be the common 2H and 4H varieties plus a new 12H polytype, and their proportions are determined. The stacking sequence of the 12H polytype is 1211111121 (Zhdanov notation). Disorder-diffuse scattering observed in the diffraction pattern is attributed to intrinsic-2h stacking faults in 2H regions of the crystal. The degree of disorder corresponds to a fault probability e= 0.15. 25

Capillary chemoembolization represents an effective concept for ablation of malignant renal tumors. It offers control of tumor growth in case of temporary inoperability as well as cessation of hematuria in a palliative situation. Because of the local ablative efficiency, it may still represent a minimally invasive option in advanced stages of renal carcinoma (i.e., in combination with immunochemotherapy or targeted therapy).

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Anharmonic effects are observed in a room-temperature neutron diffraction study of the intermetallic fluorite compound AuGa2. The analysis is performed on the basis of a single anharmonic vibrational parameter in addition to the harmonic vibrational parameters. It yields the values ~tAu = 3"08 (0"11)X 10-12 erg A-2, Ctoa = 2"91 (0"08) x 10-22 erg A,-2 for the harmonic parameters and flGa = --2" 3 (1" 2) X 10-22 erg A, -3 for the cubic anharmonic parameter. The Debye temperature is determined to be O M= 169(3) K at 294 K. Neglect of the thermal diffuse scattering correction is found to introduce an error of ~ 10 % in the Debye-Waller factors obtained. Least-squares analyses using the Zachariasen and the Becker & Coppens extinction corrections are found to give equivalent results.