铝掺杂氧化锌陶瓷的冷烧结制备及性能研究

采用两步冷烧结工艺(TS-CSP)在300℃超低温度下制备了高密度的铝掺杂氧化锌(AZO)陶瓷。采用XRD、密度测试仪、SEM、四探针测试系统等对AZO陶瓷的物相、相对密度、微观结构和电学性能进行了测试及表征。结果表明,Al掺杂量对AZO陶瓷的结构与性能有重要影响。当Al_(2)O_(3)掺杂量为2.0 wt.%时,可制备出无杂相、结构致密、电学性能良好的AZO陶瓷,经退火处理后其相对密度高达99.46%,电阻率低至3.43×10^(-3)Ω·cm。该方法制备的AZO陶瓷具有重要的应用前景。

Effects of Er-doping on the Structure and Photoelectric Properties of 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5)) O_(3) Ceramics

Multifunctional ceramics of 0.825K_(0.5)Na_(0.5)NbO_(3)-0.175Sr(Yb_(0.5)Nb_(0.5))O_(3)-x%Er with ferroelectric,transparent and luminescent properties were obtained by doping Er.The effects of Er-doping on the structure,luminescence and electrical properties of the ceramics were studied.After Er doping,the ceramics have luminescent properties and the luminescence intensity reaches the maximum when x=0.75.The ceramics still have good light transmission,but the transmittance decreases with the increase of Er-doping content due to the change of phase structure from pseudo-cubic phase to three-phase orthogonality.The energy storage properties is also greatly improved,and the W_(rec) and the η of the ceramics reach the maximum value of 0.31 J/cm^(3) and 94.6% when x=0.25,respectively.At the same time,the maximum electro-induced strain value is 0.031%.

乙酸溶液辅助超低温制备高密度α-MoO3陶瓷

采用乙酸溶液作为助溶剂,在200℃的超低温度下制备了高密度的α-MoO3陶瓷。研究了不同乙酸浓度,压强和温度对α-MoO3陶瓷致密过程的影响。结果表明,乙酸浓度对陶瓷相对密度的影响显著,在2 mol/L乙酸溶液,200℃/250MPa,保温保压30min的条件下制备获得了相对密度为96.85%的α-MoO3陶瓷,其介电常数为8.71,Qf为2336GHz。乙酸辅助超低温制备α-MoO3陶瓷的致密化机理为“溶解-再结晶-生长”。在700℃时,陶瓷体的相对失重为0.13%,表现出良好的稳定性。本研究为陶瓷的低温烧结提供了一种新的思路和方法。