Electrical Resistance of Composites and Coatings Based on Boron and Silicon-Containing Compounds in the Temperature Range 20–1000°C

Electrochemical Formation of Elemental Boron in LiCl–KCl–KBF4 at 723 K

“…22 Majumdar z E-mail: katasho.yumi@aist.go.jp investigated the behavior of B(III) ions in KCl-KF-KBF 4 at 1123--1143 K in a large-scale melt (with a total salt mixture of 2.5-3.5 kg) and reported the deposition of boron powder comprising spherical particles on a mild steel plate electrode. 23 In all the mentioned works, molten salt electrolysis has mainly been studied at temperatures above 823 K, especially around 1000 K, and we found no report that used temperatures lower than 823 K. In general, it is difficult to obtain elemental boron by molten salt electrolysis in a low-temperature bath because of the low electrical conductivity of boron as a semi-metal (5.4 × 10 2 Ω•cm at 723 K, amorphous boron powder, calculated from 24 ). However, if this process becomes feasible, molten salt electrolysis can be an energy-saving and lowcost process.…”