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

<div>Orientation <svg height="12.0001pt" id="M245" style="vertical-align:-2.43774pt" version="1.1" viewbox="-0.0498162 -9.56236 6.29776 12.0001" width="6.29776pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M454 656C454 669 448 679 426 679C383 679 312 658 265 630C226 635 207 659 207 675C207 690 212 708 223 725L193 730C160 721 123 692 123 655C123 623 152 590 208 583C163 553 120 514 120 447C120 404 148 372 181 358C101 318 21 252 21 160C21 81 64 41 148 16C166 11 189 5 212 0C274 -14 300 -33 300 -64C300 -103 273 -136 251 -162L282 -184C342 -139 402 -75 402 -5C402 57 356 84 287 103L238 116C183 129 141 155 141 208C141 263 181 317 225 341C261 328 294 324 325 324C353 324 398 381 398 409C398 421 392 428 369 428C335 428 296 421 270 414C240 425 223 449 223 483C223 533 256 570 272 579C317 579 385 586 396 592C421 606 454 646 454 656Z" id="g5-236"></path></g></svg> of the (<b>a</b> +<b> c</b>) screw TD. The inclination angle <svg height="9.49473pt" id="M246" style="vertical-align:-0.2063999pt" version="1.1" viewbox="-0.0498162 -9.28833 6.59789 9.49473" width="6.59789pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M475 507C475 612 440 712 326 712C139 712 23 420 23 215C23 96 58 -12 180 -12C369 -12 475 293 475 507ZM391 522C391 486 387 448 379 394H126C155 538 222 677 310 677C386 677 391 571 391 522ZM373 346C344 193 283 22 189 22C126 22 106 114 106 196C106 243 111 293 118 346H373Z" id="g113-230"></path></g></svg> is 31.5°.</div>

Advances in Condensed Matter Physics

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Figure 3

Figure 3: Threading Dislocations Piercing the Free Surface of an Anisotropic Hexagonal Crystal: Review of Theoretical Approaches 