铽镓石榴石晶体多晶合成与单晶生长研究

Study on the Polycrystalline Synthesis and Growth of TGG Single Crystal

以(99.99%)Ga2O3和Tb4O7为原料,按照化学计量比并适当富镓配料,采用固相反应法(分段升温工艺)合成高纯、单相的铽镓石榴石(Tb3Ga5O12,简称TGG)多晶料。使用提拉法(CZ)成功生长出44mm×70mm,外观完整无开裂、无螺旋的TGG晶体。经X线衍射分析、密度测试、晶体成分测试表明,生长的晶体结构完整,结晶性好;晶体的密度为7.14g/cm3,与理论值接近;晶体中Tb与Ga摩尔比为66%,可能存在少量Ga空位。

The high-purity and single-phase terbium gallium garnet（Tb3Ga5O12,TGG）polycrystal was synthesized by the raw materials of 99.99% Ga2O3 and Tb4O7in stoichiometric weights with proper excess of Ga through the solid phase reaction method（the segmentation warming-up technology）.An integral,crack-free,spiral-free TGG single crystal with size ofφ44mm×70mm was grown successfully by Czochralski（CZ）method.The TGG polycrystal and as-grown crystals were characterized by X-ray diffraction spectroscopy,density and composition analysis.XRD analysis.The results indicate that the as-grown crystal is integrated in structure and crystallized well.The density of TGG single crystal is 7.14g/cm3,very closed to the theoretical value.The composition analysis result shows that the ratio of Tb to Ga is 66%,that indicates that there exists a small amount of vacant of Ga.