Crystal growth and X-ray data of the lead phosphates Pb4P2O9 and Pb8P2O13

Single crystals of the title compounds have been grown by the Czochralski technique. Pb4P2O9 crystallizes in the space group P21c with the parameters a = 9.4812 A, b = 7.1303 A, c = 14.390 A, β = 104.51° and Pb8P2O13 in C2m with a = 10.641 A, b = 10.206A c = 14.342 A, β = 98.34°.