Table 7 The unit-cell parameters of the high-pressure phases of Si at ambient temperature.

From: Quasi-hydrostatic equation of state of silicon up to 1 megabar at ambient temperature

Run

Pruby28

PAu31

PW28

aAu

aW

aV

cV

aVI

bVI

cVI

aVII

cVII

aX

ST2

33.5

33.4

 

3.899

 

2.474

2.333

      

35.0

34.8

 

3.894

 

2.469

2.329

      

36.4

36.6

 

3.887

 

2.463

2.325

      

37.9

38.0

 

3.882

 

2.458

2.321

      

39.7

39.5

 

3.877

 

2.452

2.317

      

42.1

42.0

 

3.868

   

7.987

4.781

4.758

   
  1. All values are obtained using He as pressure transmitting medium. The pressures measured with the ruby fluorescence method and Au and W standards are all reported in GPa. The lattice parameters are reported in Å. Experimental uncertainty on lattice parameters is lower than 0.003 Å. Uncertainty on pressure measurement increases from 0.05 GPa at 1 GPa to 2 GPa at 150 GPa.
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