Effects of sintering on Y2O3-doped CeO2

摘要: Purpose: Having high electrical conductivity, Y2O3-doped CeO2 is a good candidate for various temperature electrochemical devices, such as solid oxide fuel cells and oxygen gas sensor. However, its inferior mechanical properties compared to competitors, e.g. ZrO2-based electrolytes, has restricted usage. Design/methodology/approach: The present work evaluates the sintering behavior of CeO2, aims enhance sinterability while restricting grain growth by doping with Y2O3. Findings: relative density, rather than Y2O3 concentration, was most important factor that affected CeO2. Increase density resulted in higher hardness elastic modulus, lower fracture toughness In optimum condition, KIC 5.1 MPa.m1/2, nanohardness 13.0 GPa, modulus 371.5 GPa were obtained undoped (density = 98.00%) sintered at 1700°C. Research limitations/implications: This study does not include temperatures. It also worth investigating formation vacancy or Ce2O3 material Practical implications: noteworthy this study, calcination mixed powders avoided order keep yitria second phase (not solute) ceria matrix. enables be more effective suppress growth. Originality/value: objectives are improve reveal effects parameters, size, on nano/micro indentation material.