高性能CCTO介电材料的高效制备方法及机理研究

The electronic information industry is developing significantly nowdays, among them, shrinking the dimensional sizes of the microelectronic device and high-density integration are the main trend. CaCu3Ti4O12(CCTO) dielectric ceramic has giant dielectric constant (about 5 of 10 square) and good stability of dielectric properties under the variation the frequency and temperature in a wide rage, providing a new way to improve the storage density of electronic components. However, currently, there is no complete explanation for the "giant dielectric property" of CaCu3Ti4O12, which prevents their efficient production and the increase of their dielectric properties. Here, we propose a new simple production method with high efficiency benefiting from special optical-electronic property of rare-earth element, which utilizes laser sintering microcrystalline growth method; as a result, modification of dielectric materials CCTO and high efficiency while decreasing the sinter temperature are realized simultaneously. Investigating the impact of production method, production condition and modification method on the property of dielectric materials, providing the production method of high-performance CCTO dielectric materials, unveiling the major factors influencing dielectric properties of CCTO dielectric materials can provide scientific basis and experimental approach for the applications of high-performance CCTO dielectric materials.

现如今电子信息产业迅猛发展，电子元件小型化、高密度集成化成为发展主要趋势。钛酸铜钙CaCu3Ti4O12（CCTO）作为一种新型的具有巨介电常数（约10的5次方）、介电性能的温度特性和频率特性稳定好的介电材料，为有效提高电子元件储能密度提供了新的途径。但目前对于CCTO的“巨介电性”的起因并没有一个完整的合理解释，直接影响了CCTO介电材料的高效制备，以及介电性能的提高。因此，申请者提出一种新的简单高效的制备方法，利用稀土的特殊光电特性，采用激光烧结微晶生长方法，在对CCTO介电材料改性的同时，降低烧结温度提高效率。研究制备方法、制备条件以及改性方法对于介电材料性能的影响。提供高性能CCTO介电材料的高效制备方法，给出影响CCTO介电材料的介电性能的主要因素，可为实现高性能CCTO介电材料的应用提供科学依据和实验途径。

目前，在电子信息产业的蓬勃发展中，小型电子器件和高密度集成存储成为了发展主要趋势。而钛酸铜钙CaCu3Ti4O12（CCTO）作为具有稳定性能的巨介电材料，可满足微电子等行业的使用需求，且在各种领域的应用中受到极大的关注。我们在实验中利用了稀土的特殊光电特性，通过激光激励生长的方法，掺入稀土元素诱导CCTO介电材料结构的稳定转变，并加入稳定剂对材料进行修饰，实现对其性能参数的调控，最后得到具有巨介电特性的稳定CCTO介电材料。