To determine whether hydrogen occupies octahedral or tetrahe

Solution

x ray diffraction would be the best.

You are measuring the kk-space (reciprocal lattice space) points with the x-ray diffraction. The Fourier transform of these points (provided you measured enough of them) gives you exactly the Bravais lattice.

The Bravais lattice is the crystal stucture! You then have to look at the Bravais lattice and construct a Wigner-Seitz unit cell, then that construction will determine your crystal type.

Alternatively, you could analyze the reciprocal lattice space \"unit cell,\" find what it looks like, then Fourier transform that cell to get the Bravais lattice cell type. The Fourier transforms here is on an infinite periodic array, if that wasn\'t clear.