Reactive intermediate phase cold sintering in strontium titanate.
Reactive intermediate phase cold sintering in strontium titanate.
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DOI：
10.1039/c8ra03072c
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发表时间：
2018-05-30
期刊：
影响因子：
3.9
通讯作者：
Randall, C. A.
中科院分区：
文献类型：
--
作者：
Boston, R.;Guo, J.;Funahashi, S.;Baker, A. L.;Reaney, I. M.;Randall, C. A.
使用反应性中间相冷烧结工艺在950 °C（常规烧结温度> 1400 °C）下制备致密（>96%理论值）钛酸锶陶瓷。将与TiO 2纳米颗粒混合的SrCl 2水溶液添加到SrTiO 3粉末中并在180 ℃下压制以获得高度压实的绿色体。在950 °C的压后加热步骤期间，TiO 2和SrCl 2在每个晶粒周围产生填充微反应，从而产生致密（>96%）的SrTiO 3陶瓷。使用纳米和微米尺寸的起始粉末，表明这种反应性中间相冷烧结途径可以致密化宽范围的起始粉末尺寸，因为它不依赖于通过平台凸肩扭结机制的非晶到结晶沉淀，如在先前的冷烧结机制中反复鉴定的。此外，该过程具有使各种功能氧化物致密化的潜力，因为可以使用一系列不同的低温化学合成路线。钛酸锶陶瓷（>96%的理论）已制造使用反应中间相冷烧结工艺与一系列的起始粉末尺寸。
Dense (>96% theoretical) strontium titanate ceramics were fabricated at 950 °C (conventional sintering temperature > 1400 °C) using a reactive intermediate phase cold sintering process. An aqueous solution of SrCl2 mixed with TiO2 nanoparticles was added to SrTiO3 powders and pressed at 180 °C to obtain a highly compacted green body. During the post-press heating step at 950 °C, the TiO2 and SrCl2 create in-filling micro-reactions around each grain resulting in dense (>96%) SrTiO3 ceramics. Nano- and micron-sized starting powders were used, demonstrating that this reactive intermediate phase cold sintering route can densify a wide range of starting powder sizes, as it not reliant on an amorphous-to-crystalline precipitation through the terrace ledge kink mechanism, as has been identified repeatedly in previous cold sintering mechanisms. Moreover, this process has the potential to densify a wide variety of functional oxides, as a range of different low-temperature chemical synthesis routes could be used. Strontium titanate ceramics (>96% theoretical) have been fabricated using a reactive intermediate phase cold sintering process with a range of starting-powder sizes.
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