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Densification of thermodynamically unstable tin monoxide using cold sintering process
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2018-11-16 , DOI: 10.1016/j.jeurceramsoc.2018.11.026
Sun Hwi Bang , Thomas Herisson De Beauvoir , Clive A. Randall

SnO is a thermodynamically unstable phase and undergoes thermal decomposition into SnO2 and Sn at a relatively low temperature when heating under ambient conditions. With the cold sintering process (CSP), SnO can be densified up to 89% of theoretical density within 100 min by applying uniaxial pressure of 350 MPa and transient liquid phase. 15-fold BET specific surface area reduction is observed between the ball-milled powder and the cold-sintered pellet, indicating experimental evidence of sintering. The temperature profiles of 70–265 °C show densification while maintaining the phase purity. Water and 2 M acetic acid solution are studied as transient liquid phases which promotes dissolution-precipitation on the particle surface and induces crystalline texture. Electrical properties of the cold sintered bulk, notably electrical conductivity and Seebeck coefficient, are measured as a function of temperature.



中文翻译:

热力学不稳定一氧化锡的冷烧结致密化

SnO是热力学不稳定相,会热分解为SnO 2当在环境条件下加热时,Sn在相对较低的温度下。通过冷烧结工艺(CSP),通过施加350 MPa的单轴压力和瞬时液相,可以在100分钟内将SnO致密化至理论密度的89%。在球磨粉和冷烧结的颗粒之间观察到BET比表面积降低了15倍,这表明有烧结的实验证据。70-265°C的温度曲线显示致密化,同时保持了相纯度。研究了水和2 M乙酸溶液作为瞬态液相的过程,该液相促进了颗粒表面的溶解沉淀并引起了晶体织构。测量冷烧结块的电性能,特别是电导率和塞贝克系数,作为温度的函数。

更新日期:2018-11-16
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