3.1.13 IBRAV=7 body-centered tetragonal lattice(体心正方格子)

CELLDM(1) $=a$, CELLDM(3) $=c/a$, $\Omega=a^{2}c/2$
$({\bf a}_{1},{\bf a}_{2},{\bf a}_{3})= ({\bf x},{\bf y},{\bf z}) \left( \beg... ...\frac{a}{2} \\ \frac{c}{2} & \frac{c}{2} & -\frac{c}{2} \end{array} \right)$
$({\bf b}_{1},{\bf b}_{2},{\bf b}_{3})= \frac{2 \pi}{a} ({\bf x},{\bf y},{\bf ... ...n{array}{ccc} 0 & 1 & 1 \\ 1 & 0 & 1 \\ a/c & a/c& 0 \end{array} \right)$