Table 2 Variations of unit cell parameters for (Mg,Fe)SiO₃ ppv across a laser-heated spot at 119 GPa. The unit cell volume of the ppv phase slightly decreased by 0.16 % over the 10 μm distance from the center to the margin in the heated spot. N is the number of reflections from multiple grains at each sample position

Sample position

N

a (Å)

σ (a)

b (Å)

σ (b)

c (Å)

σ (c)

V (ų)

σ (V)

aNe (Å)

σ (a)

P (GPa)