# Interstitial¶

class Interstitial(element, cartesian_coordinates=None, fractional_coordinates=None)

Defines an interstitial defect. Used as part of a ChargedPointDefect study.

Parameters: element (PeriodicTableElement) – The element to add at the given position. cartesian_coordinates (sequence (size 3) of PhysicalQuantity of type length) – The position at which to insert the interstitial atom, given in absolute coordinates. This option is mutually exclusive to fractional_coordinates. Default: None fractional_coordinates (sequence (size 3) of float) – The position at which to insert the interstitial atom, given in fractional coordinates of the bulk unit cell. This option is mutually exclusive to cartesian_coordinates. Default: None
cartesianCoordinates()
Returns: The coordinates of the interstitial defect as Cartesian coordinates if they have been specified, otherwise returns None. sequence (size 3) of PhysicalQuantity of type length | None
element()
Returns: The element used in the interstitial defect. PeriodicTableElement
fractionalCoordinates()
Returns: The coordinates of the interstitial defect as fractional coordinates if they have been specified, otherwise returns None. numpy.array (size 3) of float | None

## Notes¶

See Defining the point defect for a description of how to use this object as part of a ChargedPointDefect study.