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Determination of Melting Point of NaCl and KCl Doped Sulphamic Acid Single Crystals by Capillary Method (CAT#: STEM-PPA-0039-YJL)

Introduction

Nonlinear optical (NLO) materials for second harmonic generation have received consistent attention for applications in the field of tele communications, optical computing, optical information processing, optical disk data storage, laser remote sensing, laser driven fusion and colour displays, in addition to their usual role of extending the limited frequency available from a laser. Among the non linear phenomena, frequency doubling, frequency mixing and electro optic modulations are important in the field of optical image storage and optical communications. Inorganic materials are widely used in these applications because of their high melting point, high mechanical strength and high degree of chemical inertness.<br />Sulphamic acid (SA) is a classical inorganic compound and an important industrial chemical with an annual manufacture of several kilotons. The pure, NaCl and KCl doped sulphamic acid single crystals have been grown by slow evaporation method. The solubility, density and melting point measurements were estimated.




Principle

Melting point is a characteristic property of solid crystalline substance. It is the temperature at which the solid phase changes to the liquid phase. This phenomenon occurs when the substance is heated.
The melting point measurement is usually performed in thin glass capillary tubes with an internal diameter of 1 mm and a wall thickness of 0.1 – 0.2 mm. A finely-ground sample is placed in the capillary tube to a filling level of 2 – 3 mm and introduced in a heated stand (liquid bath or metal block) in close proximity to a high accuracy thermometer. The temperature in the heating stand is ramped at a user-programmable fixed rate. The melting process is visually inspected to determine the melting point of the sample.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Seal capillary.
2. Fill the sample.
3. Install the instrument.
4. Determine the melting point.

Materials

• Sample Type: crystalline compounds