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Exercise 1. Normal mode analysis
Diamond lattice (C, Si, Ge): Oh7, (Fd3m), ions at 0, 0, 0 and ¼, ¼, ¼.
Zinc blende Td4, (F(-)43m), different ions at 0, 0, 0 and ¼, ¼, ¼.
BaRuO3 9R; D3d5, (R(-)3m), ions at
BaRuO3 4H; D6h4, (P63/mmc)ions at