Growth of high quality barium titanate crystals for neuro-computers

用于神经计算机的高质量钛酸钡晶体的生长

基本信息

批准号：
07650380
负责人：
YOKOTANI Atsushi
金额：
$ 1.34万
依托单位：
Miyazaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

BaTiO_3 is one of the best photo-refractive materials for experimental researches on the optical-neuro-computings, because it has a good figure of merit and sufficiently high response. However, because many studies for the crystal growth have not been done, it is very difficult to obtain the cry cvls on commercial basis stably. This has been a severe problem for proceeding the experimental researches on optical computing.In the present research, we investigated the growth technique of BaTiO_3 crystals of good quality, in order to get the crystals of enough quality for optical computing experiments.First, the photo-refractive effects have been reconsiderates for considering to use in the optical computing. Next, the present condition of experimental researches have been surveyed in order to clarify what kinds of qualities becomes the problems in experimental work. Third, based upon these, the crystal conditions were investigated using both an induction heating and a resistance heating growth units. As a result, we found out the one of the most impotrant factor was temperature stability. We also tried to grow thin film type BaTiO_3 crystals by the pulsed laser deposition method. In this case, we found out that the origin of impurities (in this case, particles) and could discuss how to avoid the undesirable particles. Finally, we also proposed and demonstrated a new technique for coating of BaTiO_3 crystals at room temperature which is much lower than a BaTiO_3's phase transition temperature of 120.

BaTiO_3具有良好的品质因数和足够高的响应，是光学神经计算实验研究中最好的光折变材料之一。然而，由于尚未对晶体生长进行大量研究，因此很难稳定地获得商业化的晶体生长。这一直是光计算实验研究进展中的一个严峻问题。本研究中，我们对高质量BaTiO_3晶体的生长技术进行了研究，以获得足够质量用于光计算实验的晶体。一、照片- 考虑在光学计算中使用时，已重新考虑折射效应。接下来，对实验研究的现状进行了调查，以明确什么样的品质成为实验工作中的问题。第三，在此基础上，使用感应加热和电阻加热生长装置来研究晶体条件。结果，我们发现最重要的因素之一是温度稳定性。我们还尝试用脉冲激光沉积法生长薄膜型BaTiO_3晶体。在这种情况下，我们发现了杂质（在这种情况下为颗粒）的来源，并可以讨论如何避免不需要的颗粒。最后，我们还提出并演示了一种在室温下涂覆BaTiO_3晶体的新技术，该技术远低于BaTiO_3 120的相变温度。