Heat capacity and thermal conductivity of hexagonal pyrolytic boron nitride

Abstract

We have measured the heat capacity and thermal conductivity of the layered material hexagonal pyrolytic boron nitride from 2 to 10 K by a pulse-heating technique. The thermal conductivity has also been determined by a steady-state technique from 1.5 to 350 K. At low temperatures, the heat capacity has a T' dependence and the thermal conductivity a T" dependence. Crystallite size was found from transmission electron micrographs. The influence of dislocations on the thermal conductivity is discussed.

Theoretical analysis of high-field transport in graphene on a substrate

“…However, hBN has a higher and anisotropic thermal conductivity 52,53 which can lead to better cooling even for somewhat thicker dielectric layers.…”

Boron nitride encapsulated graphene infrared emitters

“…21 The thermal resistance into the silicon wafer R Si ¼ 1=½2k Si ðwLÞ 1=2 % 20 K/W, 8 where k ox % 50 W m À1 K À1 , leading to a total heat loss into the substrate, per unit length, g % 96 W K À1 m À1 , larger than in smaller exfoliated devices. However, as the basal plane (lateral) thermal conductivity of the boron nitride, $400 W m À1 K À1 at room temperature, 22 is similar to that of the graphene, the presence of the two h-BN layers increases the thickness h of the thermally conducting lateral channel. Taking the combined thickness of the graphene and two h-BN layers to be $30 nm, with an effective thermal conductivity of $500 W m À1 K À1 , yields a value of k of approximately 10 lm, which is consistent with the value obtained experimentally in this work.…”

A Covalent Organic Framework with 4 nm open pores

“…S1, ESIw), which is larger than the spacing of 0.346 nm in COF-5, 9 a structure related to that of boron nitride. 16 The slightly larger distance between the sheets along the c-axis can be attributed to the steric requirements of the methyl groups in the pores.…”