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Micro scale fracture strength of grains and grain boundaries in polycrystalline La-doped β-Si3N4 ceramics

Tamas Csanadi,Marian Gall,Marek Vojtko,Alexandra Kovalcikova,Miroslav Hnatko,Jan Dusza,Pavol Sajgalik

Journal of the European Ceramic Society（2020）

Cited 9|Views6
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Abstract
•Study the influence of La content on fracture strength of polycrystalline β-Si3N4.•Fracture strength of β-Si3N4 can reach about 11 GPa during microcantilever bending.•Fracture strength of grain boundaries decreases with increasing La content from about 3 to 2 GPa.•Experimental strength values are in agreement with the ab initio simulations using a conversion factor of six.
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Key words
β-Si3N4,Microcantilever bending,Fracture strength,Intergranular glassy phase,Ab initio simulation
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