The Double Borates Ba3Ln(BO3)3, Ln=La–Lu, Y
The Double Borates Ba3Ln(BO3)3, Ln=La–Lu, Y
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DOI：
10.1006/jssc.1999.8163
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发表时间：
1999-06
影响因子：
5.4
通讯作者：
T. Khamaganova;N. Kuperman;Z. G. Bazarova
中科院分区：
文献类型：
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作者：
T. Khamaganova;N. Kuperman;Z. G. Bazarova
在BaO-Ln_2O_3-B_2O_3三元系中得到了组成为Ba3Ln(BO_3)_3，Ln=La-Lu，Y的新化合物。生长了Ba3Yb(BO_3)_3单晶。X-射线衍射分析表明，该化合物为六方结构，空间群为P63 cm，晶胞参数为a=9.411(1)，c=17.481(5)A，Z=6。获得了每种化合物的熔点和晶胞尺寸的新温度数据。具有Ln=La-Tb的硼酸盐是等结构的，并在R3空间群中结晶。激光辐射的光学二次谐波(SHG)测量表明，Ba3Yb(BO_3)_3具有I型相变。通过对双硼酸盐Ba3Yb(BO_3)_3晶体的研究，确定该化合物具有热释电效应。
New compounds of the compositions Ba3Ln(BO3)3, Ln=La–Lu, Y were obtained in the ternary systems BaO–Ln2O3–B2O3. Single crystals were grown for Ba3Yb(BO3)3. X-ray diffraction analysis showed a hexagonal structure with space group P63cm and lattice parameters a=9.411(1), c=17.481(5) A, Z=6. The compounds with Ln=Dy–Lu, Y also crystallize in the space group P63cm. 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 Ba3Yb(BO3)3 has type I phase transition. By investigation of the crystals of the double borate Ba3Yb(BO3)3 it was established that the compound possesses a pyroelectric effect.