Property Definition (short name)
A common way to refer to the Property Definition. Note there may be multiple Property Definitions with the same short name, to fully distinguish between Property Definitions the full Tag URI must be used (the Property Definition ID).
 elasticconstantsfirststraingradientisothermalmonoatomichexagonalcrystalnpt 

Property Definition ID
The full Property Definition identifier using the Tag URI scheme.
 tag:staff@noreply.openkim.org,20160524:property/elasticconstantsfirststraingradientisothermalmonoatomichexagonalcrystalnpt 
Title
A brief onesentence description of this Property Definition.
 Isothermal first strain gradient elastic constants for a hexagonal crystal at its equilibrium lattice spacing 
Description
A description about this Property Definition.
 The five independent isothermal classical elastic constants c11, c12, c13, c33, and c55, and twenty two independent isothermal strain gradient elastic constants d11, d66, d67, d68, d69, d610, d77, d89, d810, d99, d910, d1010, d1111, d1112, d1113, d1212, d1213, d1313, d1616, d1617, d1717, and d1718, for a hexagonal simple lattice at 0 K and zero stress. The orientation of the lattice is such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. (The classical and strain gradient elastic constants are the 2nd derivatives of the strain energy density with respect to the Lagrangian strain and the Lagrangian strain gradient respectively.) 
Contributor
The user or organization who initially contributed this Property Definition.
 Admal 
Maintainer
The user or organization who currently maintains this Property Definition.
 Admal 
Creation date
The date the Property Definition was "minted", based on its Tag URI.
 20160524 
Content on GitHub
The following content may be available on GitHub: Property Definition (an EDN file containing the Property Definition Keys listed below); Physics Validator (a script provided by the user for validating that an instance of the Property is physically valid); Property Documentation Wiki (the contents of the Wiki displayed at the bottom of this page).

Property Definition Physics Validator Property Documentation Wiki 
type  float 

hasunit  true 
extent  [] 
required  true 
description  Average equilibrium conventional lattice constant of the hexagonal crystal. 
type  float 

hasunit  false 
extent  [":" 3] 
required  true 
description  Fractional coordinates of the basis atoms in the conventional unit cell. If the unit cell vectors are denoted by <a>, <b>, and <c>, and the fractional coordinates of atom 'i' are [afrac_i, bfrac_i, cfrac_i], the value of 'basisatomcoordinates' will be of the form [[afrac_1 bfrac_1 cfrac_1] [afrac_2 bfrac_2 cfrac_2] ... ]. All components of each basis atom should be between zero and one, inclusive of zero. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The average length of unit cell vector <c>. The associated direction must correspond to the third component of the entries of 'basisatomcoordinates'. The triad (<a>,<b>,<c>) must form a righthanded system. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 11 component of the isothermal elasticty matrix in Voigt notation, which corresponds to the 1111 component of the 4th order elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 12 component of the isothermal elasticty matrix in Voigt notation, which corresponds to the 1122 component of the 4th order elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 13 component of the isothermal elasticty matrix in Voigt notation, which corresponds to the 1133 component of the 4th order elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 33 component of the isothermal elasticty matrix in Voigt notation, which corresponds to the 3333 component of the 4th order elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 55 component of the isothermal elasticty matrix in Voigt notation, which corresponds to the 1313 component of the 4th order elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that the e_3 axis is perpendicular to the basal plane, and the e_2 axis passes through a vertex of the hexagon. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 11 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 111111 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 233233 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 333333 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 333113 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 333131 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 113113 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 113131 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 131131 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 123123 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 123132 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 132132 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 132231 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 24 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 222233 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 12 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 222222 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 13 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 222112 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 22 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 222121 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 23 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 222332 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 25 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 112112 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 34 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 121233 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 33 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 121332 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1617 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 332233 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  The 1616 component of the isothermal first strain gradient elasticty matrix in Voigt notation, which corresponds to the 332332 component of the 6th order first strain gradient elasticity tensor. The orthonormal basis used to express the tensor should be aligned such that e_1 and e_2 axis lie on the hexagonal plane of the crystal. 
type  string 

hasunit  false 
extent  [":"] 
required  true 
description  The element symbols of the basis atoms. The order in which the species are specified must correspond to the order of the atoms listed in 'basisatomcoordinates'. 
type  float 

hasunit  true 
extent  [] 
required  true 
description  Temperature of the crystal. 
type  string 

hasunit  false 
extent  [":"] 
required  false 
description  Short name defining the hexagonal crystal type. 
type  string 

hasunit  false 
extent  [] 
required  false 
description  HermannMauguin designation for the space group associated with the symmetry of the crystal (e.g. Immm, Fm3m, P6_3/mmc). 
type  float 

hasunit  false 
extent  [":" 3] 
required  false 
description  Coordinates of the unique Wyckoff sites used in the fully symmetryreduced description of the crystal, given as fractions of the lattice vectors. The order of elements in this array must correspond to the order of the entries listed in 'wyckoffspecies' and 'wyckoffmultiplicityandletter'. 
type  string 

hasunit  false 
extent  [":"] 
required  false 
description  Multiplicity and standard letter of the unique Wyckoff sites used in the fully symmetryreduced description of the crystal (e.g. 4a, 2b). Note that the sum of the Wyckoff multiplicities should equal the total number of elements in 'basisatomcoordinates'. The order of elements in this array must correspond to the order of the entries listed in 'wyckoffspecies' and 'wyckoffcoordinates'. 
type  string 

hasunit  false 
extent  [":"] 
required  false 
description  The element symbol of the atomic species of the unique Wyckoff sites used in the fully symmetryreduced description of the crystal. The order of the entries must correspond to the order of the entries in 'wyckoffmultiplicityandletter' and 'wyckoffcoordinates'. 