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A Novel System for Growth of Single Crystals from the Melt with an Innovative New Pulling Mechanism

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Title A Novel System for Growth of Single Crystals from the Melt with an Innovative New Pulling Mechanism
 
Creator Lal, Krishan
Kumar, Ajay
Gautam, Rajni
Jindal, Ruby
Gaur, Nidhi
 
Subject Novel system for melt growth of crystals
New pulling mechanism
Fabrication of a high temperature furnace with local clay
Growth of potassium chloride crystal
 
Description 665-670
This paper describes a crystal growth system employing novel concepts in fabrication of a high temperature furnace,
thermocouples and a novel crystal pulling mechanism. This has reduced the costs substantially, without compromising the
quality of grown crystals. The core of the furnace, a wooden cylindrical dummy had been prepared with equi-spaced helical
groves with widths equaling the diameter of the heating wire on its outer surface machined by a lathe machine. The Kanthal
heating wire was wound in the groves. It was covered with a thick layer of natural clay available locally. After the clay had
dried up, an electric current was passed through the heating wire and the wooden frame was burnt out. A thick layer of the
clay was applied on the inner and the outer surfaces. The furnace can operate at temperatures up to about 1000 °C. The
temperature was measured with a chromel-alumel thermocouple prepared by an ingenious spot-welding technique
established in the laboratory. The seed holder was hanged above the melt kept in the crucible with help of a float kept in a
water container, which has a small tap at the bottom. When the tap is opened the float goes down and the seed assembly
goes up. In this manner a quality pulling system, without any motor has been developed and reported here. It has been
possible to grow good quality crystals of potassium chloride with excellent diameter control.
 
Date 2021-10-20T09:44:06Z
2021-10-20T09:44:06Z
2021-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscair.res.in/handle/123456789/58316
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.59(10) [October 2021]