Synthesis, structure and electrical properties of Cu3.21Ti1.16Nb2.63O12 and the CuOx–TiO2–Nb2O5 pseudoternary phase diagram

Subsolidus phase relations in the CuOx–TiO2–Nb2O5 system were determined at 935 °C. The phase diagram contains one new phase, Cu3.21Ti1.16Nb2.63O12 (CTNO) and one rutile-structured solid solution series, Ti1−3xCuxNb2xO2: 0

The CuOx–TiO2–Nb2O5 phase diagram was determined at 935 °C and contains one new phase, Cu3.21Ti1.16Nb2.63O12, pictured, a modest semiconductor with εr∼63, and one rutile-structured solid solution series, Ti1−3xCuxNb2xO2.Figure optionsDownload as PowerPoint slideHighlights
► Subsolidus phase relations in the CuOx–TiO2–Nb2O5 system were determined at 935 °C.
► A new phase, Cu3.21Ti1.16Nb2.63O12 (CTNO), was found with a CaCu3Ti4O12-like crystal structure.
► We discovered one rutile-structured solid solution series, Ti1−3xCuxNb2xO2: 0► CTNO has square planar Cu2+, A site vacancies and Cu+, Ti4+ and Nb5+ disordered on octahedral sites.
► CTNO is a modest semiconductor with relative permittivity ∼63.