Editing Boron nitride (section)

=== Mechanical properties ===
BN nanosheets consist of hexagonal boron nitride (h-BN). They are stable up to 800&nbsp;°C in air. The structure of monolayer BN is similar to that of [[graphene]], which has exceptional strength,<ref name=":0">{{Cite journal |last1=Falin |first1=Aleksey |last2=Cai |first2=Qiran |last3=Santos |first3=Elton J. G. |last4=Scullion |first4=Declan |last5=Qian |first5=Dong |last6=Zhang |first6=Rui |last7=Yang |first7=Zhi |last8=Huang |first8=Shaoming |last9=Watanabe |first9=Kenji |last10=Taniguchi |first10=Takashi |last11=Barnett |first11=Matthew R. |last12=Chen |first12=Ying |last13=Ruoff |first13=Rodney S. |last14=Li |first14=Lu Hua |date=2017-06-22 |title=Mechanical properties of atomically thin boron nitride and the role of interlayer interactions |journal=Nature Communications |language=en |volume=8 |issue=1 |pages=15815 |doi=10.1038/ncomms15815 |pmid=28639613 |pmc=5489686 |issn=2041-1723|arxiv=2008.01657 |bibcode=2017NatCo...815815F }}</ref> a high-temperature lubricant, and a substrate in electronic devices.<ref>{{Cite journal |last1=Bosak |first1=Alexey |last2=Serrano |first2=Jorge |last3=Krisch |first3=Michael |last4=Watanabe |first4=Kenji |last5=Taniguchi |first5=Takashi |last6=Kanda |first6=Hisao |date=2006-01-19 |title=Elasticity of hexagonal boron nitride: Inelastic x-ray scattering measurements |url=https://link.aps.org/doi/10.1103/PhysRevB.73.041402 |journal=Physical Review B |language=en |volume=73 |issue=4 |page=041402 |doi=10.1103/PhysRevB.73.041402 |bibcode=2006PhRvB..73d1402B |issn=1098-0121}}</ref>

The anisotropy of Young's modulus and [[Poisson's ratio]] depends on the system size.<ref>{{Cite journal |last1=Thomas |first1=Siby |last2=Ajith |first2=K M |last3=Valsakumar |first3=M C |date=2016-07-27 |title=Directional anisotropy, finite size effect and elastic properties of hexagonal boron nitride |url=https://iopscience.iop.org/article/10.1088/0953-8984/28/29/295302 |journal=Journal of Physics: Condensed Matter |volume=28 |issue=29 |pages=295302 |doi=10.1088/0953-8984/28/29/295302 |pmid=27255345 |bibcode=2016JPCM...28C5302T |issn=0953-8984}}</ref> h-BN also exhibits strongly anisotropic strength and [[toughness]],<ref>{{Cite journal |last1=Ahmed |first1=Tousif |last2=Procak |first2=Allison |last3=Hao |first3=Tengyuan |last4=Hossain |first4=Zubaer M. |date=2019-04-17 |title=Strong anisotropy in strength and toughness in defective hexagonal boron nitride |url=https://link.aps.org/doi/10.1103/PhysRevB.99.134105 |journal=Physical Review B |language=en |volume=99 |issue=13 |page=134105 |doi=10.1103/PhysRevB.99.134105 |bibcode=2019PhRvB..99m4105A |issn=2469-9950}}</ref> and maintains these over a range of [[vacancy defect]]s, showing that the anisotropy is independent to the defect type.