Kavli Affiliate: Zhiting Tian
| First 5 Authors: Abhijit Biswas, Rui Xu, Joyce Christiansen-Salameh, Eugene Jeong, Gustavo A. Alvarez
| Summary:
Boron nitride (BN) is an exceptional material and among its polymorphs,
two-dimensional (2D) hexagonal and three-dimensional (3D) cubic BN (h-BN and
c-BN) phases are most common. The phase stability regimes of these BN phases
are still under debate and phase transformations of h-BN/c-BN remain a topic of
interest. Here, we investigate the phase stability of 2D/3D h-BN/c-BN
nanocomposites and show that the co-existence of two phases can lead to strong
non-linear optical properties and low thermal conductivity at room temperature.
Furthermore, spark-plasma sintering of the nanocomposite shows complete phase
transformation to 2D h-BN with improved crystalline quality, where 3D c-BN
grain sizes governs the nucleation and growth kinetics. Our demonstration might
be insightful in phase engineering of BN polymorphs based nanocomposites with
desirable properties for optoelectronics and thermal energy management
applications.
| Search Query: ArXiv Query: search_query=au:”Zhiting Tian”&id_list=&start=0&max_results=3