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- Title
Structural and mechanical properties of KН<sub>2</sub>PО<sub>4</sub> single crystals with embedded nanoparticles and organic molecules.
- Authors
Kosinova, A. V.; Kolybaeva, M. I.; Bezkrovnaya, O. N.; Tkachenko, V. F.; Grishina, E. V.; Levchenko, A. N.; Puzikov, V. M.; Pritula, I. M.
- Abstract
Single crystals of KDP crystals with embedded Urea molecules and TiO2 nanoparticles have been grown from aqueous solution by the temperature lowering method. The effect of the organic molecules and nanoparticles on the structural and mechanical properties has been studied. It has been observed that addition of Urea molecules improves laser induced damage threshold and mechanical strength of the crystal, while TiO2 nanoparticles have the opposite effect. The structure and composition of KDP:Urea crystal are studied by three-crystal X-ray diffraction analysis, which reveals the existence of a correlation between the increase of the microhardness value and the change of the crystal lattice parameter. The surface features of KDP:TiO2 crystals are analyzed by scanning electron microscopy that reveals the presence of quasi-equidistant growth bands caused by capture of the nanoparticles. It is shown that the rise of TiO2 nanoparticles concentration up to 10−4 wt.% and higher resulted in 3-fold reduction of the laser damage threshold of KDP:TiO2 relative to pure KDP in [001] and [100] crystallographic directions. It is found that microhardness and fracture toughness decrease at the nanoparticles concentration of 10−3 wt.% due to crack formation at crystal lattice discontinuities. The grown crystals also have been subjected to dielectric studies.
- Subjects
CRYSTALS spectra; POTASSIUM dihydrogen phosphate; SINGLE crystals; NANOPARTICLES; SCANNING electron microscopy
- Publication
Crystal Research & Technology, 2014, Vol 49, Issue 12, p965
- ISSN
0232-1300
- Publication type
Article
- DOI
10.1002/crat.201400285