alpha-Na6Pb3(PS4)(4), a noncentrosymmetric thiophosphate with the novel, saucer-shaped [Pb-3(PS4)(4)](6-) cluster, and its metastable, 3-dimensionally polymerized allotrope beta-Na6Pb3(PS4)(4)
Ja. Aitken et Mg. Kanatzidis, alpha-Na6Pb3(PS4)(4), a noncentrosymmetric thiophosphate with the novel, saucer-shaped [Pb-3(PS4)(4)](6-) cluster, and its metastable, 3-dimensionally polymerized allotrope beta-Na6Pb3(PS4)(4), INORG CHEM, 40(13), 2001, pp. 2938-2939