The new compound K2SiP2 crystallizes in the orthorhombic system , space group Ibam. The unit cell with the lattice constants a = 1292.6(6) pm, b - 686.7(4) pm, c - 610.7(4) pm contains 4 formula units. In the structure SiP4 tetrahedra form chains by sharing common edges. The [(SiP2)2-] strings are isosteric to the SiS2 molecules.
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Eisenmann et al. (1984) studied this question.
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