Control of reaction processes for rapid synthesis of low-thermal-expansion Ca1−Sr Zr4P6O24 ceramics

The reaction pathways for the synthesis of Ca 1− x Sr x Zr 4 P 6 O 24 (0 x 3 , ZrO 2 and P 2 O 5 by solid state method are studied. It is found that there are two reaction pathways: one is through an intermediate phase to final products while another is direct reaction from starting materials to destination ones, depending on experimental procedures and drying and sintering temperatures. By well controlling the reaction along the latter pathway, the sintering time of Ca 1− x Sr x Zr 4 P 6 O 24 (0 x 1− x Sr x Zr 4 P 6 O 24 and related refractory compounds.