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Study on cracking of KDP seed crystal caused by temperature nonuniformity

Abstract

The phenomenon of cracking of KDP z-cut seed crystals with a series of sizes due to the temperature difference with growth solution was explored in detail. Thermal stress generated in the KDP seed crystal at the moment of cracking was calculated using finite-element method. Temperature differences leading to cracking for heating samples are nearly two times of those for cooling specimens. For cooling samples, the cracks happened mainly along (100), (110) and (001) crystal planes and expanded from sample periphery to the interior spaces, and an opposite crack propagation direction has been displayed in heating samples, cracks were mainly along (110) plane. More importantly, temperature differences decrease with the increase of sample sizes. In addition, the calculated results indicate that the field distribution of tensile stress is coincident with the points of crack initiation. The maximum stresses calculated are larger than fracture strength of 6.67 MPa for KDP crystal along [100] direction, and the direction of large stresses is normal to the fracture surface. It is interesting that the maximum stresses in fracture crystals decrease with the increase of crystal sizes as cracks generated.

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Publication details

The article was received on 04 Apr 2018, accepted on 14 May 2018 and first published on 17 May 2018


Article type: Paper
DOI: 10.1039/C8CE00521D
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Study on cracking of KDP seed crystal caused by temperature nonuniformity

    P. Huang, S. Wang, D. Wang, H. Liu, G. Liu and L. Xu, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00521D

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