Table 1 Experimental conditions and phases present at 1700 K.

From: Complete agreement of the post-spinel transition with the 660-km seismic discontinuity

Run no.

P3BM (GPa)a

PVinet (GPa)b

D1700 K (min)c

Phases

M2271

23.38(4)

23.69(4)

90

Rw + (Brg + Pc)d

M2272

23.56(5)

23.88(5)

60

Rw + (Brg + Pc)d

M2268

23.70(6)

24.02(6)

100

Brg + Pc

M1991

23.83(5)

24.16(5)

120

Brg + Pc

M2258

24.26(3)

24.59(3)

70

Brg + Pc

M2263

24.58(4)

24.91(5)

80

Brg + Pc

M2277

24.88(7)

25.22(7)

30

Brg + Pc

  1. Abbreviations: Rw, ringwoodite; Brg, bridgmanite; Pc, periclase.
  2. a,bPressures calculated from the third-order Birch–Murnaghan and the Vinet equations of states of MgO by ref.11, respectively.
  3. cDuration for which the temperature was maintained at 1700 K.
  4. dThese were judged to be metastable phases (see the Methods section).
  5. The numbers in parentheses refer to the standard deviation in the last digit of the preceding number.
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