Isotropic Negative Area Compressibility over Large Pressure Range in Potassium Beryllium Fluoroborate and its Potential Applications in Deep Ultraviolet Region

Xingxing Jiang; Siyang Luo; Lei Kang; Pifu Gong; Wenjiao Yao; Hongwei Huang; Wei Li; Rongjin Huang; Wei Wang; Yanchun Li; Xiaodong Li; Xiang Wu; Peixiang Lu; Laifeng Li; Chuangtian Chen; Zheshuai Lin

doi:10.1002/adma.201502212

Isotropic Negative Area Compressibility over Large Pressure Range in Potassium Beryllium Fluoroborate and its Potential Applications in Deep Ultraviolet Region

Adv Mater. 2015 Sep 2;27(33):4851-7. doi: 10.1002/adma.201502212. Epub 2015 Jul 17.

Authors

Xingxing Jiang^{1

2}, Siyang Luo¹, Lei Kang^{1

2}, Pifu Gong^{1

2}, Wenjiao Yao¹, Hongwei Huang¹, Wei Li³, Rongjin Huang⁴, Wei Wang⁴, Yanchun Li⁵, Xiaodong Li⁵, Xiang Wu⁶, Peixiang Lu³, Laifeng Li⁴, Chuangtian Chen¹, Zheshuai Lin¹

Affiliations

¹ Center for Crystal R&D, Key Lab of Functional Crystals and Laser Technology of Chinese Academy of Sciences, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
² University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
³ School of Physics and Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan, 430074, China.
⁴ Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
⁵ Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
⁶ School of Earth and Space Sciences, Peking University, Beijing, 100871, China.

PMID: 26184364
DOI: 10.1002/adma.201502212

Abstract

Isotropic negative area compressibility, which is very rare, is observed in KBBF and the related mechanism is investigated by combined high-pressure X-ray diffraction (XRD) experiments and first-principles calculations. The strong mechanical anisotropy leads to a large Poisson's ratio and high figure of merit for the acoustic-optics effect, giving KBBF potential applications as smart strain converters and deep-ultraviolet (DUV) acoustic-optic devices.

Keywords: Poisson's ratio; acoustic-optics effects; isotropic negative area compressibility; potassium beryllium fluoroborate.