Effect of TiB2 and Boron Additions on the Stability of Wurtzite‐Type Boron Nitride at High Temperatures and Pressures

Abstract

Shock‐synthesized wurtzite‐type BN(w‐BN) and mixtures of w‐BN–TiB2 and w‐BN–ß were treated at high temperatures and pressures. The effect of TiB2 and boron additions on the transformation of w‐BN to zinc blende‐type BN(z‐BN) was studied at 1000° to 2200°C and 55 to 68 kbars. The formation region of z‐BN was shifted toward higher temperatures by TiB2 additions and toward lower temperatures by boron additions.