固相晶体生长技术的发展——从籽晶诱导到无籽晶生长

文章综合概述了固相法晶体生长技术的发展过程与研究进展。首先,回顾了在陶瓷烧结与冶金工艺中经常出现的晶粒异常长大现象,以及由此发展起来的固相法晶体生长技术。对固相法晶体生长工艺和应用领域等进行了简要介绍,对固相法晶体生长技术的典型应用案例和发展历程进行了叙述。然后,着重介绍了一种新的固相晶体生长技术——无籽晶固相晶体生长技术。对无籽晶固相晶体生长技术在无铅铁电压电晶体—铌酸钾钠基晶体中的应用进行详细介绍,并将该方法与常规的高温熔体法和籽晶诱导固相法晶体生长技术的特点进行了比较。最后,在介绍当前关于固相法晶体生长机理讨论的基础上,针对无籽晶固相晶体生长技术,提出了一种新的综合机制模型,力图解释无籽晶固相晶体生长的机理。对无籽晶固相晶体生长技术当前存在的问题以及未来的发展,分别进行了简要的说明与展望。

Development of Solid-state Crystal Growth Technology: from Seed-induced to Seed-free Growth

The article summarizes the development and latest research progress of solid-state crystal growth(SSCG)technology.First of all,the phenomenon of abnormal grain growth in ceramic sintering and metallurgy process is reviewed,and the SSCG technology is also introduced.The process and application fields of the SSCG technology are introduced briefly.Some of typical application cases and development history of the SSCG technology are also described.Then,a new solid-state crystal growth technology:seed-free,solid-state crystal growth(SFSSCG)technology is introduced.The application of the SFSSCG technology in the lead-free ferroelectric and piezoelectric crystal,that is potassium sodium niobate based crystal,is introduced in detail,and the characteristics of this method are compared with the conventional high-temperature melt and SSCG method.Finally,based on the current discussion on the crystal growth mechanism of the solid-state method,a new comprehensive crystal growth mechanism is proposed for the SFSSCG method.And the current problems and future development of the SFSSCG technology are briefly described and prospected,respectively.