Dislocation structure at a {(1)over-bar2(1)over-bar0}/%26lt; 10(1)over-bar0 %26gt; low-angle tilt grain boundary in LiNbO3

作者：Nakamura Atsutomo^*; Tochigi Eita; Nakamura Jun nosuke; Kishida Ippei; Yokogawa Yoshiyuki

来源：Journal of Materials Science, 2012, 47(13): 5086-5096.

DOI：10.1007/s10853-012-6373-7

LiNbO3 is a ferroelectric material with a rhombohedral R3c structure at room temperature. A LiNbO3 bicrystal with a {(1) over bar2 (1) over bar0}/%26lt; 10 (1) over bar0 %26gt; 1 degrees low-angle tilt grain boundary was successfully fabricated by diffusion bonding. The resultant boundary was then investigated using high-resolution TEM. The boundary composed a periodic array of dislocations with b = 1/3 %26lt;(1) over bar2 (1) over bar0 %26gt;. They dissociated into two partial dislocations by climb. A crystallographic consideration suggests that the Burgers vectors of the partial dislocations should be 1/3 %26lt; 01 (1) over bar0 %26gt; and 1/3 (1) over bar 100, and a stacking fault on {(1) over bar2 (1) over bar0} is formed between the two partial dislocations. From the separation distance of a partial dislocation pair, a stacking fault energy on {(1) over bar2 (1) over bar0} was estimated to be 0.25 J/m(2) on the basis of isotropic elasticity theory.

• 出版日期2012-7