Phase equilibria in the Bi2O3-CuO-Nb2O5 ternary system. Issue 6 (15th April 2017)

• Record Type: Journal Article
• Authors: Tan, K.B.; Chon, M.P.; Khaw, C.C.; Zainal, Z.; Taufiq-Yap, Y.H.; Chen, S.K.; Tan, P.Y.
• Is Part Of: Ceramics international. Volume 43:Issue 6(2017)
• Page Start: 4930
• Page End: 4936
• Publication Date: 2017-04-15
• Subjects: Ceramics -- Sintering -- Powder diffraction -- Phase equilibria; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.12.147
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: A complete subsolidus ternary phase diagram of the Bi2 O3 -CuO-Nb2 O5 (BCN) system was constructed. Careful firing control and phase analysis were applied to determine the phase assemblages and compatibilities over a wide range of temperatures, i.e. 700–925 °C. Phase-pure BCN pyrochlores were found to crystallise in cubic symmetry, space group Fd 3 m, No. 227 with lattice constants in the range of 10.4855 (5)<x<10.5321 (3). The mechanism of this limited subsolidus series could be represented by a general formula, Bi3.08−x Cu1.84+2x/9 Nb3.08+7x/9 O14.16+6x/9 (0≤x≤0.36) wherein the reduction in Bi content was compensated by a proportion amount of copper and niobium together with non-stoichiometry in oxygen.