Table 6 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

ST1

17.9

 

17.3

 

3.112

2.547

2.380

      

25.5

 

23.3

 

3.096

2.510

2.357

      

33.3

 

32.4

 

3.073

2.476

2.334

      

40.9

 

39.8

 

3.056

2.449

2.315

      

43.5

 

42.5

 

3.050

  

7.962

4.774

4.755

   

46.0

 

45.0

 

3.045

  

7.921

4.758

4.742

   

48.6

 

47.7

 

3.039

     

2.451

4.160

 

50.9

 

50.1

 

3.034

     

2.443

4.146

 

53.0

 

52.3

 

3.030

     

2.437

4.135

 

55.1

 

54.4

 

3.026

     

2.431

4.125

 

57.1

 

56.4

 

3.022

     

2.425

4.115

 

59.2

 

58.6

 

3.018

     

2.419

4.105

 

61.1

 

60.3

 

3.014

     

2.415

4.096

 

63.0

 

62.2

 

3.011

     

2.410

4.089

 

64.9

 

64.3

 

3.007

     

2.405

4.081

 

66.8

 

66.0

 

3.004

     

2.400

4.072

 

68.5

 

67.9

 

3.000

     

2.396

4.064

 

70.4

 

69.9

 

2.997

     

2.391

4.064

 

72.1

 

71.7

 

2.994

     

2.388

4.051

 

73.6

 

73.1

 

2.991

     

2.385

4.047

 

75.9

 

75.2

 

2.988

     

2.381

4.036

 

77.5

 

76.9

 

2.985

     

2.376

4.031

 

79.8

 

79.1

 

2.981

     

2.372

4.023

 

82.0

 

81.2

 

2.978

     

2.367

4.015

 

84.3

 

83.6

 

2.974

     

2.363

4.008

 

86.9

 

86.4

 

2.969

     

2.357

3.997

 

88.7

 

87.8

 

2.967

     

2.354

3.994

 

90.8

 

89.8

 

2.964

     

2.352

3.990

3.342

91.7

 

90.8

 

2.962

     

2.351

3.985

3.342

93.1

 

92.1

 

2.960

     

2.350

3.981

3.340

94.4

 

93.7

 

2.958

     

2.349

3.975

3.337

96.1

 

95.4

 

2.955

       

3.334

98.2

 

97.4

 

2.952

       

3.328

100.3

 

99.3

 

2.950

       

3.323

102.2

 

101.3

 

2.947

       

3.320

104.0

 

103.4

 

2.944

       

3.314

105.2

 

104.2

 

2.943

       

3.312

ST3

15.8

15.6

 

3.978

 

2.563

2.381

      

16.0

15.7

 

3.977

 

2.555

2.387

      

16.1

15.9

 

3.976

 

2.554

2.384

      

16.3

16.0

 

3.974

 

2.554

2.386

      

ST2

16.5

16.8

 

3.972

 

2.550

2.385

      

17.6

17.6

 

3.968

 

2.545

2.382

      

18.1

18.2

 

3.965

 

2.542

2.380

      

19.8

19.8

 

3.957

 

2.534

2.375

      

21.6

21.3

 

3.9500

 

2.525

2.369

      

23.5

23.4

 

3.940

 

2.515

2.362

      

25.7

25.6

 

3.930

 

2.505

2.355

      

27.4

27.5

 

3.923

 

2.498

2.350

      

28.9

28.8

 

3.917

 

2.492

2.346

      

30.4

30.4

 

3.910

 

2.486

2.342

      

32.0

32.0

 

3.904

 

2.480

2.337

      
  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.