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Institute for Single Crystals

National Academy of Sciences of Ukraine

61001, Ukraine, Kharkiv, 60 Nauky Ave., phone/fax: +38(057)340-86-19, e-mail: info@iscrystals.com

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Monodisperse Spherical Heteroparticles Nano-powders of "Core-Shell" Type

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The promising non linear optic single crystals Ca9Ln(VO4)7 (Ln – Y, La, Gd) have been grown by the Czochralski method

The promising non linear optic single crystals Ca9Ln(VO4)7 (Ln – Y, La, Gd) have been grown by the Czochralski method. The deviation from Ca/Ln stoichiometric ratio in the crystals was observed. The magnitude of deviation is increasing from Y to Gd.
The typical growth defects forming during crystal growth are region enriched by Ln element. It leads to a strong scattering of laser beam. The REM image of  Ca9Gd(VO4)7 crystal surface presented in Fig.2. Bright regions have higher Zeff. Typical size of defective region enriched by Gd is d 5-10μm.
Now the technology of production of homogeneous composition Ca9Ln(VO4)7 (Ln – Y, La, Gd) crystals is under developing.
11_CaYVO_crystal.jpg
Fig.1. Single crystal Ca9Y(VO4)7.Fig.2. REM image of Ca9Gd(VO4)7 crystal surface (reflected electrone mode).

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phone:  +38(057)340-86-19,
fax:       +38(057)340-86-19,
e-mail:   info@iscrystals.com