GB/T 31093-2014Test method for stress of monocrystalline sapphire ingot (English PDF)

1 Scope

This standard specifies the sapphire single crystal ingot stress testing methods.

This standard applies to processed through the diameter of 50.8mm ~ 200mm c-sapphire ingot to stress tests, other sizes blue

Gem ingot (hereinafter referred to as ingot) can refer to the use of stress tests.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 14264 semiconductor material terms

3 Terms and Definitions

Terms and definitions GB/T 14264 apply to this document defined.

4 Method summary

Sapphire is a uniaxial crystal, c-axis to the optical axis. Typical convergence plane polarized light interference test device, the optical axis of the crystal vertical section

Straight and parallel to the optical axis of the instrument, in the case of convergent light, will produce interference light cone is formed in FIG. Conoscopic plot by a black cross and concentric

Interference color circle composed of interference color circle with black cross an intersection as the center (the optical axis of the dew point), concentric ring, how much interference color circle, depending on the grain

Birefringence body size and thickness.

When the crystal structure is destroyed the local rules, the stress generated in the optical axis direction so that the position changes, the light beam passes through this position , The resulting conoscopic figure black cross distortion, so you can observe the position of each crystal light cone diagram to detect stress crystals.

5 disturbances

6 Test Equipment

Strain gauge, the typical optical path shown in Figure 1. The optical instruments the speed of light by an insulating sheet from the light source (1) (2), a condenser

Mirror (3), a mirror (4) and the polarizer (5) of plane galvanometer, by diverging lens (7), a glass table (8) projected onto the sample being tested, the most

After the adoption of the analyzer (10) will see the light cone pattern with stress characteristics.