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Impedance Spectroscopy Study of Sintering in Bi‐Doped ZnO

1994; Wiley; Volume: 77; Issue: 6 Linguagem: Inglês

10.1111/j.1151-2916.1994.tb09747.x

1551-2916

Kelly S. Kirkpatrick, Thomas O. Mason, U. Balachandran, R.B. Poeppel,

Ferroelectric and Piezoelectric Materials

Solid‐ and liquid‐state sintering kinetics in the (1 – x)ZnO‐xBi 2 O 3 system with 0 ≤ x ≤ 0.05 over the range 600 ≤ T (°C) ≤ 1100 were investigated by impedance spectroscopy. Compositions with x < 0.002 retarded sintering, whereas compositions with x ≥ 0.004 accelerated sintering above the eutectic temperature of 740°C. The results could be interpreted in terms of limited solid solubility of Bi 2 O 3 in ZnO ( x ≃ 0.004 ± 0.002), solid‐state sintering in the subsolidus, and liquid‐state sintering above the solidus. A phase diagram for the ZnO‐rich end of the system is proposed, based on these results.