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Suspension crucible for growth of lithium niobate crystal with near stoichiometric ratio and its growth process

A near-stoichiometric ratio and crystal growth technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve the difficulty of batch growth of near-stoichiometric lithium niobate crystals, the reduction of lithium content in the melt, and the difficulty of crystal growth. Obtain stable and consistent composition and other issues, to achieve the effect of controlling and regulating, overcoming too low temperature in the growth zone, and good auxiliary heating effect

Inactive Publication Date: 2005-08-17
SHANDONG UNIV +1
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Problems solved by technology

In addition, since the outer crucible has been kept at high temperature, long-term crystal growth in an open environment will reduce the lithium content in the melt, and it is difficult to obtain a stable and consistent composition of the grown crystals.
[0007] Although the double-crucible system provides a feasible method for growing near-stoichiometric lithium niobate crystals, the stable batch growth of near-stoichiometric lithium niobate crystals is still very difficult due to the existence of these disadvantages

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  • Suspension crucible for growth of lithium niobate crystal with near stoichiometric ratio and its growth process

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Embodiment Construction

[0018]Accompanying drawing is exactly a preferred embodiment of the present invention. There is a refractory disc 2 at the bottom of the ceramic crucible 1, and a circular hole is opened in the center of the disc 2. A refractory support cylinder 3 is vertically placed on the disc 2, and a horizontal support is fixed on the upper end of the refractory support cylinder 3. The precious metal ring 4 is used, the precious metal cylinder 5 with the edge is vertically suspended on the inner diameter of the ring 4, the precious metal crucible 6 is placed horizontally on the refractory support plate 7, and the support plate 7 passes through the round hole on the bottom surface of the ceramic crucible 1 The support shaft 8 is connected with the rotating lifting device, and the crown afterheater 9 with a central opening is fixed on the upper end of the refractory support cylinder 3. The outside of the afterheater is an insulating material 10, and a seed rod 12 with a seed crystal 11 Ente...

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Abstract

The present invention belongs to the field of crystal material technology, and includes mainly setting one support disc inside ceramic crucible, setting one refractory cylinder vertically on the disc, fixing one noble metal ring horizontally on the cylinder, hanging one noble metal cylinder on inner edge of the ring, and making the noble metal crucible rotate around the support shaft and move up and down and the heating winding move up and down with the crucible. During melting material, the noble metal crucible is separated from the noble metal cylinder; and during growing crystal, the noble metal cylinder separates the noble metal crucible into two regions, growth region and melt region. The present invention has the advantages of high material melting efficiency, homogeneous stirring, less volatilization of lithium oxide, easy regulation of temperature field, being favorable to stable crystal growth, etc.

Description

(1) Technical field [0001] The invention relates to a hanging crucible for growing near-stoichiometric lithium niobate crystals, belonging to the technical field of crystal materials. (2) Background technology [0002] As we all know, as an important optoelectronic functional material, lithium niobate crystals are widely used in optical transmission, video and audio devices, frequency doubled lasers and optical storage and other fields. [0003] Lithium niobate is generally grown by the Czochralski method, and lithium niobate crystals of the same composition are grown at the same composition point in the lithium oxide-niobium oxide binary phase diagram. Because lithium niobate crystals with the same composition are non-stoichiometric compounds, [lithium] / [niobium] is about 48.6 / 51.4, severe lithium deficiency, and a large number of intrinsic defects are formed in the crystal, which has many disadvantages to the performance of lithium niobate influence, which limits the appl...

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Application Information

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IPC IPC(8): C30B15/10C30B29/30
Inventor 王继扬刘宏高磊张怀金徐现刚蒋民华吴建波秦晓勇朱怀烈
Owner SHANDONG UNIV
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