Table 1 Voigt bulk modulus BV, shear modulus GV, and ideal strength (minimum tensile strength σmin and shear strength τmin) of transition metal tetraborides (TmB4, Tm = Cr, Mn, Fe) calculated by first principles methods.

From: Crystal Field Splitting is Limiting the Stability and Strength of Ultra-incompressible Orthorhombic Transition Metal Tetraborides

Compound

Reference

B V

G V

CrB4

This study

279

267

19

265

261

23

263

267

 

31

237 *

255 *

  

MnB4

This study

281

247

19

270

245

  

FeB4

This study

285

192

19

253

177

  

28

284

194

 

48

265

198

27

268

189

  

31

250 *

181 *

  

32

277

186

  

WB3

6

293

245

MoB3

6

276

226

OsB2

44

313

181

ReB2

12

348

274

B6O

45

231

218

BN

46

376

390

Diamond

45,47

442

528

  1. Previous theoretical results for WB36, MoB36, OsB244, ReB212, B6O45, BN46 and Diamond45,47 are included for comparison. *is calculated using Voigt-Reuss-Hill approximation
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