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ＬｉＮｂＯ３单晶作为重要的声表面波基底材料，虽具有机电耦合系数大等诸多优势，但亦存在着温度系数大这一严重问题，故在温度变化较大的条件下使用时，只得用ＬｉＴａＯ３单晶来代替。而ＬｉＴａＯ３单晶作为声表面波材料，仅温度系数一项优于ＬｉＮｂＯ３单晶，其余各项都不及，且价格是ＬｉＮｂＯ３单晶的３倍之多，故降低ＬｉＮｂＯ３单晶的温度系数，实现以“Ｎｂ”代“Ｔａ”是声表面波行业上急待解决的难题。为降低ＬｉＮｂＯ３单晶的温度系数，日本学者曾从理论上导找具有零温度系数的新切型，但由于对切割精度的要求很苛刻，实验结果延时温度系数都在７０ｐｐｍ／Ｋ以上（纯ＬｉＮｂＯ３单晶１２７．６８°Ｙ切的延时温度系数的７６ｐｐｍ／Ｋ）。美国和原苏联学者亦试图通过选择切型来降低ＬｉＮｂＯ３单晶的温度系数，同样未见成效。我们借鉴掺杂改善ＬｉＮｂＯ３单晶光学性能和陶瓷温度性能的成果，确定了通过掺杂改善ＬｉＮｂＯ３单晶温度性能的思路，并选取与ＬｉＮｂＯ３单晶具有相反温度系数的物质为掺杂剂。掺杂ＬｉＮｂＯ３单晶的生长选择再生的器件用ＬｉＮｂＯ３单晶体边角料为基础原料，选择过渡金属氧化物为掺杂剂，采取变速溶盐提粒法，生长了５种掺杂ＬｉＮｂＯ３单晶，并用?
Although LiNbO3 single crystal is an important surface acoustic wave substrate, it possesses many advantages such as large electromechanical coupling coefficient and so on. However, there is also a serious problem of large temperature coefficient. Therefore, when LiNbO3 is used under the condition of large temperature change, LiTaO3 single Crystal instead. The LiTaO3 single crystal as a surface acoustic wave material, only a temperature coefficient better than LiNbO3 single crystal, the remaining items are not, and the price is three times as much as LiNbO3 single crystal, so reducing the temperature coefficient of LiNbO3 single crystal, to achieve To “Nb” on behalf of “Ta” is the SAW industry urgent problem to be solved. In order to reduce the temperature coefficient of LiNbO3 single crystals, Japanese scholars have theoretically found new cutting patterns with zero temperature coefficient. However, due to the harsh cutting requirements, the delay temperature coefficients are all over 70ppm / K LiNbO3 single crystal 127.68 ° Y cut delay temperature coefficient of 76ppm / K). The United States and the former Soviet Union scholars also tried to reduce the temperature coefficient of LiNbO3 single crystal by choosing the type of cut, with no success. We learn from the results of doping to improve the optical properties of LiNbO3 single crystal and the temperature performance of the ceramic, to determine the doping to improve the temperature performance of LiNbO3 single crystal ideas, and selected with LiNbO3 single crystal has the opposite temperature coefficient of the material as a dopant. Growth of LiNbO3 single crystal doped with selected regeneration device LiNbO3 single crystal scrap as the base material, the choice of transition metal oxide as a dopant to take variable speed salt precipitation method, the growth of 5 doped LiNbO3 single crystal, and use?