Abstract
The investigation of the AgNbO 3–Nb 2O 5 system is carried out using solid-state routes. This investigation allows to confirm the existence of four compounds with structure related to the Na-based homologous. A new form of AgNb 3O 8 is evidenced and its structure is determined on the basis of single-crystal X-ray diffraction investigations. This compound crystallizes in the orthorhombic system (SG Pbam) with cell parameters a=12.453(4) Å; b=12.416(1) Å; c=3.9700(4) Å. It presents a TTB type host network in which triangular tunnels remain empty, square ones are fully filled with Ag + and pentagonal ones show mixed occupancy with Ag + and [NbO] 3+ entities. Crystal-chemistry investigations show that despite a complex and more or less disordered structure, no evidence for solid solution domain is observed.
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