Self-growth of centimeter-scale single crystals by normal sintering process in modified potassium sodium niobate ceramics

Cheol Woo Ahn, Ho Yong Lee, Guifang Han, Shujun Zhang, Si Young Choi, Jong Jin Choi, Jong Woo Kim, Woon Ha Yoon, Joon Hwan Choi, Dong Soo Park, Byung Dong Hahn, Jungho Ryu

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22 Scopus citations

Abstract

In this manuscript, an interesting phenomenon is reported. That is the self-growth of single crystals in Pb-free piezoelectric ceramics. These crystals are several centimeters in size. They are grown without any seed addition through a normal sintering process in modified potassium sodium niobate ceramics. It has been achieved by the composition designed to compensate the Na + loss which occurs during the liquid phase sintering. The composition of the crystals is (K0.4925 Na0.4925-x Ba0.015+x/2)Nb 0.995+x O3 [x is determined by the Na+ loss, due to Na2O volatilization]. These crystals have high piezoelectric voltage coefficients (g33, 131 10-3 Vm/N), indicating that they are good candidates for piezoelectric sensors and energy harvesting devices. We hope that this report can offer the opportunity for many researchers to have an interest in these crystals.

Original languageEnglish (US)
Article number17656
JournalScientific reports
Volume5
DOIs
StatePublished - Dec 3 2015

All Science Journal Classification (ASJC) codes

  • General

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