Helium
Wyckoff R W G
Crystal Structures 1 (1963) 7-83
Second edition. Interscience Publishers, New York, New York
Sample at T = 2 K
Hexagonal closest packed, hcp, structure
_database_code_amcsd 0011177
3.57 3.57 5.83 90 90 120 P6_3/mmc
atom x y z
He 1/3 2/3 .25
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Helium
Henshaw D G
Physical Review 109 (1958) 328-330
Structure of solid helium by neutron diffraction
Locality: synthetic
Sample: at T = 1.1 K and P = .007 GPa
_database_code_amcsd 0015152
3.53 3.53 5.76 90 90 120 P6_3/mmc
atom x y z
He 1/3 2/3 .25
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Helium
Schuch A F, Grilly E R, Mills R L
Physical Review 110 (1958) 775-775
Structure of the alpha and beta forms of solid He
Locality: synthetic
Sample: at T = 1.9 K & P = .01 GPa
Note: structure known as the alpha form
_database_code_amcsd 0015153
4.01 4.01 4.01 90 90 90 Im3m
atom x y z
He 0 0 0
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Helium
Schuch A F, Grilly E R, Mills R L
Physical Review 110 (1958) 775-775
Structure of the alpha and beta forms of solid He
Locality: synthetic
Sample: at T = 3.3 K & P = .018 GPa
Note: structure known as the beta form
_database_code_amcsd 0015154
3.46 3.46 5.60 90 90 120 P6_3/mmc
atom x y z
He 1/3 2/3 .25
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Helium
Schuch A F, Mills R L
Physical Review Letters 6 (1961) 596-597
New allotropic form of He3
Locality: synthetic
Sample: at T = 18.76 K & P = .171 GPa
_database_code_amcsd 0015271
4.242 4.242 4.242 90 90 90 Fm3m
atom x y z
He 0 0 0
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Helium
Schuch A F, Mills R L
Physical Review Letters 6 (1961) 596-597
New allotropic form of He3
Locality: synthetic
Sample: at T = 15.98 K & P = .136 GPa
_database_code_amcsd 0015272
3.046 3.046 4.986 90 90 120 P6_3/mmc
atom x y z
He 1/3 2/3 .25
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Helium
Schuch A F, Mills R L
Physical Review Letters 8 (1962) 469-470
Structure of the gamma form of solid He4
Locality: synthetic
Sample: at T = 1.73 K & P = .003 GPa
Note: structure known as gamma phase
_database_code_amcsd 0015273
4.11 4.11 4.11 90 90 90 Im3m
atom x y z
He 0 0 0
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Helium
Schuch A F, Mills R L
Physical Review Letters 8 (1962) 469-470
Structure of the gamma form of solid He4
Locality: synthetic
Sample: at T = 1.73 K & P = .003 GPa
_database_code_amcsd 0015274
3.650 3.650 5.945 90 90 120 P6_3/mmc
atom x y z
He 1/3 2/3 .25
Download AMC data (View Text File )Download CIF data (View Text File )Download diffraction data (View Text File )View JMOL 3-D Structure (permalink )
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