本文關(guān)鍵詞： 四硼酸鋰 壓電晶體 坩堝下降法 聲表面波器件 孿晶　出處：《上海應(yīng)用技術(shù)學(xué)院》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：LBO晶體是一種新型的壓電材料,屬于四方晶系,在聲表面波方面有這優(yōu)越的性能,并且原料來源廣泛,沒有環(huán)境污染,已經(jīng)通過我國科學(xué)家首創(chuàng)的坩堝下降法實(shí)現(xiàn)了工業(yè)應(yīng)用。但是缺陷依然嚴(yán)重影響了大尺寸LBO晶體的工業(yè)化生產(chǎn)。研究缺陷的形成機(jī)理可以從生產(chǎn)工藝上改進(jìn)來減少缺陷的生成。我參與了部分的LBO晶體下降法生長,并在實(shí)驗(yàn)室長期以來的生產(chǎn)累積的基礎(chǔ)上收集了許多含有開裂、氣泡、云層和孿晶等宏觀缺陷的LBO晶體樣品,并對樣品進(jìn)行了拋光、腐蝕等處理。采用自己改良的坩堝下降爐,成功生長了110、011取向的LBO壓電晶體,并初步掌握了LBO晶體下降法生長工藝。觀察到了LBO晶體中的孿晶形貌是不一樣的,但都遵從道芬規(guī)律,即可以通過一定的轉(zhuǎn)換,沿著X軸或Y軸旋轉(zhuǎn)180°形成孿晶。在這篇論文里,分析了LBO晶體的孿晶起源和形成機(jī)理,對LBO晶體的生長工作提出了一定的建議。
[Abstract]:LBO crystal is a new type of piezoelectric material, which belongs to tetragonal system. It has excellent performance in surface acoustic wave (saw), and has a wide range of raw materials and no environmental pollution. Industrial application has been realized by crucible descent method initiated by Chinese scientists. However, defects still seriously affect the industrial production of large-sized LBO crystals. The mechanism of defect formation can be improved to reduce the production process. Less defect generation. I was involved in partial LBO crystal descent growth, Many samples of LBO crystals containing cracks, bubbles, clouds and twins were collected on the basis of accumulated production in the laboratory for a long time. The samples were polished and corroded. 110,011 oriented LBO piezoelectric crystals were successfully grown, and the technique of LBO crystal descent growth was preliminarily mastered. It was observed that the twinning morphology in LBO crystals was different, but all of them obeyed the Daufen law, that is, they could be converted to a certain extent. Twinning is formed by rotating 180 擄along the X axis or Y axis. In this paper, the origin and formation mechanism of twins in LBO crystals are analyzed, and some suggestions for the growth of LBO crystals are given.
【學(xué)位授予單位】：上海應(yīng)用技術(shù)學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB34;O78

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本文編號(hào)：1517514