The compound K3Sb3P2O14 . 5H(2)O was first synthesized by hydrothermal
crystallization, and characterized by XRD, P-31 MAS NMR, IR, DTA-TG a
nd so on, The compound crystallizes in the rhombohedral system with a=
0.71377 nm, b=0.71377 nm, c=3.08047 nm, a=90 degrees, beta=90 degrees
gamma=120 degrees, and has a layered structure. The potassium ions are
situated between the covalent layers.