Thermal Conductivity of BeO Single Crystals

Abstract

The thermal conductivities of three single crystals of BeO have been measured from 2 to 300 K. Phonons carry the heat at all temperatures. At 300 K the conductivity is 3.7 W/cm K, which is slightly less than that of copper. In the purest sample the maximum conductivity occurs at 45 K where it is 137 W/cm k, and at temperatures below 10 K the conductivity is limited by boundary scattering. The anisotropy in the conductivity of this hexagonal material is 20% or less.

Mechanical and electronic properties of Ca1−Mg O alloys

“…Recently, the alkaline earth oxides MO (M ¼Be, Mg, Ca, Sr, Ba) have gained more and more attentions due to their various unique physical and chemical properties and potential technological applications [1][2][3][4][5]. There have been a large number of research papers related to MgO [6][7][8][9][10][11][12] and CaO [12][13][14][15][16][17][18][19][20].…”

Lattice thermal conductivity of group-IV and III–V semiconductor alloys

“…However, the difference between K Ќ and K ʈ usually appears to be less than the experimental uncertainty at room temperature. 25 Figure 6 shows the thermal conductivity K versus composition x for ͑Ga, In͒-based IIIϪV ternary alloys: ͑a͒ Ga x In 1−x As and ͑b͒ Ga x In 1−x Sb. The experimental data are taken for Ga x In 1−x As from Abrahams et al 26 and Arasly et al 27 and for Ga x In 1−x Sb from Magomedov et al 28 The solid lines represent the calculated results of Eq.…”

Lattice dynamics of beryllium oxide: Inelastic x-ray scattering andab initiocalculations

“…Noteworthy, this material is close to being isotopically pure as Be has only one natural isotope and natural oxygen contains 99.8% of 16 O. It has found many applications due to its unusually high thermal conductivity ͑ϳ3.7 W / cm K at room temperature and 137 W / cm K at 45 K͒, 1 high electrical resistivity ͑large direct gap of ϳ10.63 eV͒, 2 high bulk modulus, and high melting point. It has been used as a nuclear moderator and reflector material, as well as a heat sink for high-power applications.…”