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Boron arsenide (BAs) with a zinc blende structure has recently beendiscovered to exhibit unusual and ultrahigh thermal conductivity (k), providinga new outlook for research on BAs and other high thermal conductivitymaterials. Technology for BAs crystal growth has been continuously improving,however, the influence of boron isotopes, pure or mixed, on the thermalconductivity in BAs is still not completely clear. Here we report detailedstudies on the growth of single crystals of BAs with different isotopic ratiosand demonstrate that the k of isotopically pure BAs is at least 10% higher thanthat of BAs grown from natural B. Raman spectroscopy characterization showsdifferences in scattering among various BAs samples. The presented results willbe helpful in guiding further studies on the influence of isotopes onoptimizing k in BAs.

Boron isotope effect on the thermal conductivity of boron arsenide single crystals