base class, extends NXobject
One group like this per component can be recorded For a sample consisting of multiple components.
symbolic array lengths to be coordinated between various fields
n_Temp: number of temperatures
n_eField: number of values in applied electric field
n_mField: number of values in applied magnetic field
n_pField: number of values in applied pressure field
n_sField: number of values in applied stress field
- Groups cited:
@default: (optional) NX_CHAR
Declares which child group contains a path leading to a NXdata group.
It is recommended (as of NIAC2014) to use this attribute to help define the path to the default dataset to be plotted. See https://www.nexusformat.org/2014_How_to_find_default_data.html for a summary of the discussion.
name: (optional) NX_CHAR
Descriptive name of sample component
chemical_formula: (optional) NX_CHAR
The chemical formula specified using CIF conventions. Abbreviated version of CIF standard:
Only recognized element symbols may be used.
Each element symbol is followed by a ‘count’ number. A count of ‘1’ may be omitted.
A space or parenthesis must separate each cluster of (element symbol + count).
Where a group of elements is enclosed in parentheses, the multiplier for the group must follow the closing parentheses. That is, all element and group multipliers are assumed to be printed as subscripted numbers.
Unless the elements are ordered in a manner that corresponds to their chemical structure, the order of the elements within any group or moiety depends on whether or not carbon is present.
If carbon is present, the order should be:
C, then H, then the other elements in alphabetical order of their symbol.
If carbon is not present, the elements are listed purely in alphabetic order of their symbol.
This is the Hill system used by Chemical Abstracts.
Crystallography unit cell parameters a, b, and c
Crystallography unit cell parameters alpha, beta, and gamma
Volume of the unit cell
This will follow the Busing and Levy convention from Acta.Crysta v22, p457 (1967)
orientation_matrix[3, 3]: (optional) NX_FLOAT
Orientation matrix of single crystal sample component. This will follow the Busing and Levy convention from Acta.Crysta v22, p457 (1967)
Mass of sample component
Density of sample component
Relative Molecular Mass of sample component
description: (optional) NX_CHAR
Description of the sample component
volume_fraction: (optional) NX_FLOAT
Volume fraction of component
Scattering length density of component
unit_cell_class: (optional) NX_CHAR
In case it is all we know and we want to record/document it
Any of these values:
space_group: (optional) NX_CHAR
Crystallographic space group
point_group: (optional) NX_CHAR
Crystallographic point group, deprecated if space_group present
transmission: (optional) NXdata
As a function of Wavelength
Table of hypertext anchors for all groups, fields, attributes, and links defined in this class.
documentation (reST source) anchor
web page (HTML) anchor