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首页> 外文期刊>Journal of Crystal Growth >Zone-leveling Czochralski Growth And Characterization Of Undoped And Mgo-doped Near-stoichiometric Lithium Tantalate Crystals
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Zone-leveling Czochralski Growth And Characterization Of Undoped And Mgo-doped Near-stoichiometric Lithium Tantalate Crystals

机译：区域平整直拉生长和未掺杂和Mgo掺杂的近化学计量钽酸锂晶体的表征

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摘要

Undoped and MgO-doped near-stoichiometric lithium tantalate (SLT) crystals were grown by the zone-leveling Czochralski (ZLCz) technique for the first time from Li-rich solutions (mixed with 1.2 mol% MgO for MgO-doped SLT crystal) having Li-excess feed supplied from below in an iridium crucible. Inclusion-free crystals were obtained. The transmittance along the growth axis was found to be satisfactory (75 ± 1%) having an absorption edge at 264.1 ± 0.5 nm for undoped and 264.8 ± 0.4 nm for MgO-doped SLT crystals. The refractive indices of the crystals were found to be n_o=2.1768 and n_c=2.1750 ± 0.0002 for undoped and n_o=2.1768 and n_e=2.1784 ± 0.0006 for MgO-doped SLT crystals, respectively. The Curie temperature and coercive field for the crystals were measured to be 680 ± 3 ℃ and 1.95 ± 0.65 kV/mm for undoped and 689 ± 0.7 C and 3.55 ± 0.95 kV/mm for MgO-doped SLT crystals, respectively. ICP measurement gives the Li/Ta ratios as 0.995 ± 0.002 and 0.9755 ±0.0145 in undoped and MgO-doped SLT crystals, respectively. The Mg/Ta ratio in MgO-doped crystal was measured to be 0.001235 ±0.00035. The Li/Ta ratio was found to vary along the crystal length in undoped and MgO-doped SLT crystals. The variation of the Mg/Ta ratio in MgO-doped SLT crystals is explained by mass balance equation.
机译：通过区域均化切克劳斯基（ZLCz）技术首次从富含Li的溶液中（与1.2 mol％MgO混合用于MgO掺杂的SLT晶体）生长无掺杂和MgO掺杂的近化学计量的钽酸锂（SLT）晶体。从下方在铱坩埚中供应过量锂。获得不含夹杂物的晶体。发现沿着生长轴的透射率是令人满意的（75±1％），对于未掺杂和在掺杂MgO的SLT晶体中具有264.1±0.5nm的吸收边缘和264.8±0.4nm的吸收边缘。发现该晶体的折射率对于未掺杂分别为n_o ＝ 2.1768和n_c ＝ 2.1750±0.0002，对于掺杂MgO的SLT晶体分别为n_o ＝ 2.1768和n_e ＝ 2.1784±0.0006。对于未掺杂的晶体，居里温度和矫顽场的测量值分别为680±3℃和1.95±0.65 kV / mm，对于掺杂MgO的SLT晶体，其居里温度分别为689±0.7 C和3.55±0.95 kV / mm。 ICP测量得出，未掺杂和掺MgO的SLT晶体的Li / Ta比分别为0.995±0.002和0.9755±0.0145。掺杂MgO的晶体中的Mg / Ta比经测量为0.001235±0.00035。发现在未掺杂和MgO掺杂的SLT晶体中，Li / Ta的比率沿晶体长度变化。用质量平衡方程解释了掺MgO的SLT晶体中Mg / Ta比的变化。

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