Effect of the Second Sintering Temperature on the Microstructure and Electrical Properties of PbNb2O6-0.5 wt.%ZrO2 Obtained via a Two-Step Sintering Process

摘要

Lead metaniobate PbNb2O6 ceramics with addition of 0.5 wt.% ZrO2 (PNZr) were processed via the conventional solid-state reaction method and a two-step sintering process. A lower second sintering temperature efficiently prevents volatilization of Pb2+. X-ray diffraction patterns indicate that the samples are of orthorhombic ferroelectric phase. Scanning electron microscopy shows that abnormal grain growth was restrained. The dielectric anomalies around 300A degrees C caused by oxygen vacancies are effectively reduced.