a1 Research Centre Juelich GmbH, Institute for Processes and Materials in Energy Systems, 52425 Juelich, Germany
a2 Central Glass and Ceramic Research Institute, 700032 Calcutta, India
The crystal structure of several compounds of Ca1−xSrxZr4(PO4)6 ceramics has been investigated by X-ray powder diffraction at room temperature. All compounds form a solid solution with a unique unit cell. While the lattice parameter a of the hexagonal unit cell decreases of about 0.9% with increasing Sr content only slightly, it considerably elongates in c direction (2.8%). No structural transformation has been observed by high-temperature X-ray diffraction up to 1000 °C.
(Received September 12 2003)
(Accepted November 19 2003)