Two new arsenates with general formula A(II)(ZaAsO(4))(2) (A=Sr, Ba) were s
ynthetized by solid state reaction. Furthermore, a high pressure form. of B
a(ZnPO4)(2) was obtained under hydrothermal conditions. Indexing of their X
-ray diffractograms was carried out with a monoclinic unit-cell and space g
roup P2(1)/c. These compounds are isostructural with Sr(ZnPO4)(2) and the p
aracelsian form of Ba(AlSiO4)2. (C) 1999 International Centre for Diffracti
on Data. [S0885-7156(98)00704-0].