Abstract
The Bi2O3–Nb2O5–NiO phase diagram at 1100°C was determined by means of solid‐state synthesis, X‐ray diffraction, and scanning electron microscopy. A ternary eutectic with a melting point below 1100°C was found to exist in the field between NiO, Bi2O3, and the end‐member of the δBi2O3–Nb2O5 solid solution. The existence of the previously reported Bi3Ni2NbO9 phase was disproved. A pyrochlore homogeneity range around Bi1.5Ni0.67Nb1.33O6.25 was determined together with all the phase relations in this phase diagram.
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