Threading Dislocations Piercing the Free Surface of an Anisotropic Hexagonal Crystal: Review of Theoretical Approaches

Table 1

Elastic constants of GaN. In anisotropic elasticity, the equilibrium angle of the inclined (a + c) TD is small, weakly depending on the existence of a free surface (columns 8 and 9). It is not the case in isotropic elasticity (columns 10 and 11). Symbols A, S and I means Anisotropy, Surface and Isotropy.

(GPa)						(GPa),
Refs.							AS	A∞	IS	I∞
[13]	367	135	103	405	95	113, 0.27	2.6°	3.8°	4.8°	11.6°
[14]	388	154	84	458	85	112, 0.28	2.5°	3.6°	4.9°	11.6°
[15]	329	109	80	357	91	107, 0.25	2.4°	3.6°	4.5°	11.6°
[16]	390	145	106	398	105	120, 0.26	2.8°	4.4°	4.8°	11.6°
[17]	374	106	70	379	101	121, 0.22	2.0°	3.0°	4.2°	11.6°
[18]	359	129	92	389	98	113, 0.26	2.4°	3.7°	4.7°	11.6°
[19]	334	132	99	372	86	100, 0.28	2.6°	3.8°	4.9°	11.6°