Table S3.
Composition | c-Axis longitudinal, m/s | c-Axis transverse, m/s | a-Axis longitudinal, m/s | a-Axis transverse, m/s | a-Axis transverse, m/s | Debye temperature, K |
CaMg2Bi2 | 3,057 | 2,658 | 3,133 | 2,146 | 1,817 | 248 |
EuMg2Bi2 | 2,870 | 1,646 | 2,796 | 2,186 | 1,640 | 223 |
YbMg2Bi2 | 2,500 | 1,420 | 2,680 | 1,748 | 1,200 | 222 |