Electrtic Transport Properties and the Size Effect in ZrO_2-Based Ceramic Materials

摘要

Amorphous nanomaterials in the ZrO_2-CeO_2 system are synthesized.The aging and crystallization processes in a complex zirconium-cerium hydrogel are investigated.Powders with a crystal size of 45-100 nm are prepared.Samples having a porosity of less than 2.2% are produced from the powders.It is demonstrated that tetragonal zirconia-based solid solutions Zr_(1-x)Ce_xO_(2-delta)sintered at a temperature of 1500deg C possess ionic conductivity in air and in noble gasses.The assumptions are made regarding the mechanisms of ionic (surface anionic)and electronic (hopping)conduction in samples of the 88ZrO_2 centre dot 12CeO_2 (mol %)composition.The solid solutions prepared can be used at a temperature of 720deg C as high-strength inexpensive solid electrolytes.