0.5Nb 0.5) 0.005(Ti 1-xZr x) 0.995O 2 colossal permittivity ceramics]]>

摘要

AbstractIn, Nb, and Zr co-doped TiO2((In0.5Nb0.5)0.005(Ti1-xZrx)0.995O2) (x?=?0–0.80) ceramics were prepared by a solid-state reaction method, and their structures, dielectric properties, and response to DC bias were studied. The solubility limit was found to be near x?=?0.10, and the excess added Zr was present in the form of secondary ZrTiO4phase. The mean grain size increased from 20.2 to 39.5?μm in the x?=?0–0.10 range and then decreased to 5.2?μm for x?=?0.20. Permittivity at 1?kHz exceeded 104for the samples in the x?=?0–0.20 range and then decreased to 570 for x?=?0.40. For x?=?0.20, the ceramic sample showed εr?≈?104and tanδ?≤?0.05 (20?Hz–100?kHz), as well as good temperature (?150 to 125?°C) and DC bias (0–875?v/cm) stability. The breakdown electric field increased from 940?v/cm for x?=?0 to 5770?v/cm for x?=?0.20. The excellent dielectric properties are attributed to the coexistence of smaller grains and the presence of insulating ZrTiO4in the sample.Graphical abstractDisplay OmittedHighlights?The ((In0.5Nb0.5)0.005(Ti1-xZrx)0.995O2) (x?=?0–0.80) ceramics have been investigated.?For x?=?0.20 samples: εr?≈?104, tanδ??Good properties were related to smaller grains and insulating ZrTiO4.]]>