Lead-free (Ag,K)NbO3 materials for high-performance explosive energy conversion.
Lead-free (Ag,K)NbO3 materials for high-performance explosive energy conversion.
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DOI：
10.1126/sciadv.aba0367
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发表时间：
2020-05
期刊：
影响因子：
13.6
通讯作者：
Zhen Liu;Teng Lu;Fei Xue;Hengchang Nie;R. Withers;A. Studer;F. Kremer;N. Narayanan;Xianlin Dong;D. Yu;Long-qing Chen;Yun Liu;Genshui Wang
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文献类型：
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作者：
Zhen Liu;Teng Lu;Fei Xue;Hengchang Nie;R. Withers;A. Studer;F. Kremer;N. Narayanan;Xianlin Dong;D. Yu;Long-qing Chen;Yun Liu;Genshui Wang
具有极快响应时间的爆炸能量转换材料在能源、医疗、国防和采矿领域具有广泛且不断增长的应用。在这一领域，对潜在机制的研究和对新候选材料的寻找是如此有限，以至于环境不友好的Pb（Zr，Ti）O3在半个世纪后仍然占据主导地位。在这里，我们报告了一种以前未发现的无铅（Ag0.935K0.065）NbO 3材料的发现，该材料具有5.401 J/g的创纪录高储能密度，能够在1.8微秒内实现约22 A的脉冲电流。它还具有出色的温度稳定性，高达150°C。各种原位实验和理论研究揭示了这种爆炸能量转换的机制可以归因于压力诱导的八面体倾斜从a-a- c +到a-a- c -/a-a- c +的变化，与不可逆的压力驱动的铁电-反铁电相变一致。本工作为Pb（Zr，Ti）O3的高性能替代物提供了一种新的选择，也为进一步开发新的爆炸能量转换材料和器件提供了指导。
Explosive energy conversion materials with extremely rapid response times have broad and growing applications in energy, medical, defense, and mining areas. Research into the underlying mechanisms and the search for new candidate materials in this field are so limited that environment-unfriendly Pb(Zr,Ti)O3 still dominates after half a century. Here, we report the discovery of a previously undiscovered, lead-free (Ag0.935K0.065)NbO3 material, which possesses a record-high energy storage density of 5.401 J/g, enabling a pulse current ~ 22 A within 1.8 microseconds. It also exhibits excellent temperature stability up to 150°C. Various in situ experimental and theoretical investigations reveal the mechanism underlying this explosive energy conversion can be attributed to a pressure-induced octahedral tilt change from a - a - c + to a - a - c -/a - a - c +, in accordance with an irreversible pressure-driven ferroelectric-antiferroelectric phase transition. This work provides a high performance alternative to Pb(Zr,Ti)O3 and also guidance for the further development of new materials and devices for explosive energy conversion.