General chemical formula: A6B10C4O30 or [(A1)2(A2)4C4][(B1)2(B2)8]O30 The unit cell of tungsten bronze crystal is a network structure composed of 10 oxygen octahedra connected by common top, containing 4 pentagonal prisms with 15 coordination, 2 tetragonal prisms with 12 coordination and 4 triangular prisms. The C site can be filled or vacant, and can only be occupied by ions with a small ion radius such as Li+, the B site is occupied by smaller high-valent cations (such as Nb5+, Ta5+, Ti4+, etc.) and the A site can be occupied by larger cations (such as K+, Na+, Ba2+, Sr2+, La3+, Nd3+, etc.) are fully or partially filled.
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