Pyrochlore Phases in the System ZnO–Bi2O3–Sb2O5: I. Stoichiometries and Phase Equilibria |
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Authors: | G C Miles A R West |
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Affiliation: | Department of Engineering Materials, The University of Sheffield, Sheffield S1 3JD, U.K. |
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Abstract: | Two cubic pyrochlore phases exist in the system ZnO–Bi2O3–Sb2O5. Neither has the supposed "ideal" stoichiometry, Zn2Bi3Sb3O14. One, P 1, is a solid solution phase, Zn2+ x Bi2.96−( x − y )Sb3.04− y O14.04+δ where 0< x <0.13(1), 0< y <0.017(2) and a =10.4285(9)−10.451(1) Å. The other, P 2, is a line phase, Zn2Bi3.08Sb2.92O13.92 with a =10.462(2) Å. Subsolidus phase relations at 950°C involving phases P 1 and P 2 in the ZnO–Bi2O3–Sb2O5 phase diagram have been determined. |
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