Lead-free (Ag,K)NbO3materials for high-performance explosive energy conversion

Zhen Liu, Zhen Liu, Teng Lu, Fei Xue, Hengchang Nie, Ray Withers, Andrew Studer, Felipe Kremer, Narendirakumar Narayanan, Narendirakumar Narayanan, Xianlin Dong, Xianlin Dong, Dehong Yu, Longqing Chen, Yun Liu, Genshui Wang, Genshui Wang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article numberEABA0367
JournalScience Advances
Volume6
Issue number21
DOIs
StatePublished - May 2020

All Science Journal Classification (ASJC) codes

  • General

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