Ca,(l'O,),OH, M , = 502.3, hexagoiial, P 6Jti1, a = Y.4207(3), c = 6.8780(2) A, V =-= 528.67 AJ, 2 = 2, D , = 3.156 Mg . iii-', C u K a , IKa, = 1.54051, AKa, = 1.54433 A, p = 26.25 i i i t i i -l , F(OO0) = 500, T = 294 K. T h e powder diffructioii pattern was arialysetl by tho Rietveld tilethod. T h e parameters were refined by t h e progratii P P S R (DBW2.9) to final R-factors R , = 0.079, R,, = 0.081 and R, = 0.015. C~L~( P O~)~O H , M , = 502.3, hex&g~tittl, P 6Jtli, u = Y.4207(3), c = (i.8?80(2) A,, c' = 528.87 AJ, 2 = 2, D , = 3.158 Mg I I I -~, CuKa, AKa, = 1.54051, AKa, = 1.54434 A [L = 26.25 i~i t t i -~, F(000) = 500, T' = 284 K . D a s Pr~lverl~eugutigstliajil.ullll,, w~~r t l t : t i i i t der Rietveld-Methode analysiert. Die Ptlraineter wurden init deli1 Prograiiitil P P S R (DRW2.9) bis zii den abschlielknden R-Faktoren R, = 0.079, R,, = 0.081 uiitl 8 1 , = 0.015 verfeinert.