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The Double Borates Ba3Ln(BO3)3, Ln=La–Lu, Y

✍ Scribed by T.N Khamaganova; N.M Kuperman; Zh.G Bazarova

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
186 KB
Volume
145
Category
Article
ISSN
0022-4596

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✦ Synopsis

New compounds of the compositions Ba 3 Ln(BO 3 ) 3 , Ln ‫؍‬ La+Lu, Y were obtained in the ternary systems BaO+Ln 2 O 3 + B 2 O 3 . Single crystals were grown for Ba 3 Yb(BO 3 ) 3 . X-ray diffraction analysis showed a hexagonal structure with space group P6 3 cm and lattice parameters a ‫؍‬ 9.411(1), c ‫؍‬ 17.481(5) A s , Z ‫؍‬ 6. The compounds with Ln ‫؍‬ Dy+Lu, Y also crystallize in the space group P6 3 cm. New temperature data on melting points and unit-cell dimensions were obtained for each compound. The borates with Ln ‫؍‬ La+Tb are isostructural and crystallize in the space group R3 . Optical second harmonic generation (SHG) measurements of laser radiation showed that Ba 3 Yb(BO 3 ) 3 has type I phase transition. By investigation of the crystals of the double borate Ba 3 Yb(BO 3 ) 3 it was established that the compound possesses a pyroelectric e4ect.

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