Table 2. Raman Mode Frequency of lt-Mn3(VO4)2 and Its Pressure Dependence in the Range up to 10 GPaa.
| Raman mode frequency ωi (cm–1) |
 (cm–1/GPa) |
isothermal mode Grüneisen parameter 
|
|---|---|---|
| 102.3(1) | 0.4(1) | 0.5(1) |
| 121.9(1) | 1.2(1) | 1.14(9) |
| 148.2(5) | 1.1(2) | 0.9(1) |
| 171.8(2) | 2.7(1) | 1.82(7) |
| 242.3(2) | 1.4(1) | 0.67(5) |
| 252.2(4)b | 3.4(2) | 1.56(9) |
| 272.8(8) | 4.5(2) | 1.91(8) |
| 320.3(1) | 1.3(1) | 0.47(4) |
| 327.1(1)b | 3.9(4) | 1.4(1) |
| 376.8(2) | 2.0(1) | 0.61(3) |
| 407.2(5) | 3.5(2) | 1.00(6) |
| 435.8(4) | 2.2(1) | 0.58(3) |
| 649.9(8) | 5.5(2) | 0.98(3) |
| 690.2(3) | 4.6(2) | 0.77(3) |
| 782.8(8) | 1.35(2) | 0.20(3) |
| 796.1(3) | 2.0(2) | 0.29(3) |
| 809.2(2) | 2.8(2) | 0.40(3) |
a
The isothermal mode Grüneisen parameters are calculated using zero-pressure bulk modulus B0 = 116 GPa determined from high-pressure XRD.
b
Indicates modes that appear only at high pressures due to lifting of degeneracy.