Design of a Low-Cost Automatic Diameter Control Czochralski (CZ) Crystal Growth System with VB.6.0 Software
Czochralski technique has become the method of choice for the growth of many oxide materials that have applications in the lasers, radiation detectors and nonlinear optical devices. This technique is one of the widely used methods for growing bulk single crystals with high quality and homogeneity from congruent melts with faster growth rates. The present paper presents the design of a Czochralski crystal growth system with Automatic Diameter Control (ADC) developed in our Crystal Growth Laboratory. The system controls the diameter of the growing crystal by continuous weighing of growing crystal. The difference between the measured diameter and the desired diameter is incorporated in a feedback loop for controlling the temperature of the system using a computer controlled Visual basic V6.0 based control algorithm. A conventional pulling and rotation mechanism of the crystal is computer controlled using two stepper motors. The other components such as seed holder, pulling arrangement and seed weighing mechanism are designed and built in our workshop. The complete system costs approximately twenty five thousand dollars. Thus, system will be beneficial for Labs having limited budget and will be good learning experience for graduate students.
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Document Type: Research Article
Publication date: December 1, 2014
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