TY - JOUR
T1 - Cracking process at lineages in Czochralski-grown 36°-RY LiTaO3 ingots
AU - Ohno, Yutaka
AU - Kajigaya, Tomio
AU - Osako, Kazutaka
AU - Kochiya, Toshio
N1 - Funding Information:
TEM was supported by the Laboratory of Alpha-Ray Emitters in IMR, Tohoku University, under the Inter-University Cooperative Research Program in IMR (No. 20M0403). TEM specimens were fabricated at the Material Solutions Center, Tohoku University.
Publisher Copyright:
© 2021 The Author(s)
PY - 2021/9/15
Y1 - 2021/9/15
N2 - Cracking process at lineages during the Czochralski (CZ) growth of 36°-RY lithium tantalate (LiTaO3) single crystals was examined. Twin lamellae on (1¯012) and (11¯02) were generated at lineages beneath the –Z’ surface of the ingots, via the dissociation of the dislocations composing the lineages. Two kinds of twin lamellae grew with the CZ growth towards the bottom of the ingots, forming the intersections nearly parallel to the growth direction. Cracking occurred at the intersections with developing the twin lamellae. The twinning accompanied with cracking took place when the diameter of the ingots was suddenly decreased. It is hypothesized that the decrease was introduced by an accidental fluctuation of growth temperature, and therefore, radial tensile stresses needed for twinning would be applied at the circumference of the ingots.
AB - Cracking process at lineages during the Czochralski (CZ) growth of 36°-RY lithium tantalate (LiTaO3) single crystals was examined. Twin lamellae on (1¯012) and (11¯02) were generated at lineages beneath the –Z’ surface of the ingots, via the dissociation of the dislocations composing the lineages. Two kinds of twin lamellae grew with the CZ growth towards the bottom of the ingots, forming the intersections nearly parallel to the growth direction. Cracking occurred at the intersections with developing the twin lamellae. The twinning accompanied with cracking took place when the diameter of the ingots was suddenly decreased. It is hypothesized that the decrease was introduced by an accidental fluctuation of growth temperature, and therefore, radial tensile stresses needed for twinning would be applied at the circumference of the ingots.
KW - A1. Characterization
KW - A1. Defects
KW - A1. Etching
KW - A1. X-ray topography
KW - A2. Czochralski method
KW - B1. Lithium compounds
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U2 - 10.1016/j.jcrysgro.2021.126228
DO - 10.1016/j.jcrysgro.2021.126228
M3 - Article
AN - SCOPUS:85108660924
VL - 570
JO - Journal of Crystal Growth
JF - Journal of Crystal Growth
SN - 0022-0248
M1 - 126228
ER -