Abstract In eight quadrants, the positive and negative signs of tensor components describing physical properties of biaxial crystals have been given. The distributions of the physical properties described with different order tensors and their space symmetries have been discussed. These results show that the distributions of effective physical constants are symmetrical in the eight quadrants for the orthorhombic system, but there are two and four kinds of distributions for monoclinic and triclinic systems respectively. Thence, to avoid ambiguities and difficulties in characterizing and applying properties of biaxial crystals, we suggest that the really positive directions of the coordinate axes should be defined before the measurements of their physical properties and their device applications.
Received: 08 October 2020
Revised: 09 November 2020
Accepted manuscript online: 02 December 2020
PACS:
61.50.Ah
(Theory of crystal structure, crystal symmetry; calculations and modeling)
Fund: Project supported by the National Key Research and Development Program of China (Grant No. 2016YFB1102201), the 111 Project 2.0 (Grant No. BP2018013), the National Natural Science Foundation of China (Grant Nos. 51772170, 51572155, and 11504389), the Shandong Provincial Key R&D Program, China (Grant No. 2018CXGC0411), the Young Scholars Program (Grant No. 2018WLJH67), and the Fundamental Research Founds of Shandong University (Grant No. 2017JC044).
Fuan Liu(刘孚安), Zeliang Gao(高泽亮), XinYin(尹鑫), and Xutang Tao(陶绪堂) Space symmetry of effective physical constants for biaxial crystals 2021 Chin. Phys. B 30 026104
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