Peculiarities of the Structure, Moduli of Elasticity, and Knoop Indentation Patterns of Deformation and Fracture of Single Crystals of Potassium, Rubidium, Cesium, and Ammonium Hydrophthalates
- Authors: Novikova N.E.1, Lisovenko D.S.2, Sizova N.L.1
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Affiliations:
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
- Ishlinsky Institute for Problems in Mechanics
- Issue: Vol 63, No 3 (2018)
- Pages: 438-450
- Section: Physical Properties of Crystals
- URL: https://journals.rcsi.science/1063-7745/article/view/192554
- DOI: https://doi.org/10.1134/S1063774518030197
- ID: 192554
Cite item
Abstract
The crystal structure of potassium, rubidium, cesium, and ammonium hydrophthalates is analyzed based on the data in the literature. A relationship between their structure and elastic and mechanical properties has been established for the first time. Young’s moduli, shear moduli, and Poisson’s ratios in the (100), (010), and (001) planes of these crystals are calculated, and Knoop indentation of these planes is performed. Anisotropy of the elastic and mechanical properties of the crystals is revealed. Rubidium, cesium, and ammonium hydrophthalates are found to be partial auxetics. Ammonium hydrophthalate, whose structure contains additional (as compared with other hydrophthalates) hydrogen bonds, exhibits the highest anisotropy of properties.
About the authors
N. E. Novikova
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Author for correspondence.
Email: nata110565@mail.ru
Russian Federation, Moscow, 119333
D. S. Lisovenko
Ishlinsky Institute for Problems in Mechanics
Email: nata110565@mail.ru
Russian Federation, Moscow, 119526
N. L. Sizova
Shubnikov Institute of Crystallography, Federal Scientific Research Centre “Crystallography and Photonics,”
Email: nata110565@mail.ru
Russian Federation, Moscow, 119333