High densification of BaZrS3 powder inspired by the cold-sintering process
High densification of BaZrS3 powder inspired by the cold-sintering process
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DOI：
10.1557/s43578-021-00404-1
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发表时间：
2021-09
影响因子：
2.7
通讯作者：
Stephen Filippone;S. Song;R. Jaramillo
中科院分区：
文献类型：
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作者：
Stephen Filippone;S. Song;R. Jaramillo
我们报告了硫属化物钙钛矿 BaZrS3 粉末在低温和中温下的烧结。 BaZrS3 是研究最广泛的硫族化物钙钛矿半导体。迄今为止，大多数实验结果都是使用松散粉末和冷压颗粒（即生坯）获得的。由于 BaZrS3 在 550 °C 以上的空气中会分解和氧化，因此采用直接的烧结方法来获得致密陶瓷具有挑战性。在这里，我们从冷烧结工艺中汲取灵感，开发了硫系钙钛矿的低至中致密化工艺。用于氧化物冷烧结的典型添加剂不会加速 BaZrS3 烧结。在较高温度下，碘作为加速致密化的添加剂非常成功。在 450 °C 和 425 MPa 下烧结，我们的密度高达 92%。我们的烧结过程不会导致明显的氧化。热重测量揭示了晶间相的形成。阻抗谱测量表明，整体介电性能不受球磨和随后的烧结的影响。
We report on the sintering of powders of the chalcogenide perovskite BaZrS3 at low and intermediate temperatures. BaZrS3 is the most widely studied chalcogenide perovskite semiconductor. Most experimental results to-date have been made using loose powder and cold-pressed pellets (i.e. green bodies). Straightforward sintering methods to achieve dense ceramics are challenging because BaZrS3 decomposes and oxidizes in air above 550 °C. Here, we take inspiration from the cold-sintering process to develop a low-to-intermediate densification process for chalcogenide perovskites. Typical additives for cold sintering of oxides do not accelerate BaZrS3 sintering. At higher temperature, iodine is remarkably successful as an additive to accelerate densification. We achieve density up to 92% for sintering at 450 °C and 425 MPa. Our sintering process does not cause significant oxidation. Thermogravimetric measurements reveal the formation of an intergranular phase. Impedance spectroscopy measurements reveal that the bulk dielectric properties are unaffected by ball milling and subsequent sintering.