Introductory remarks
Wondratschek, H.,

International Tables for Crystallography
(2011).
Vol. A1,
Section 1.2.7.1,
p.

[ doi:10.1107/97809553602060000791 ]
of homogeneous regions which are called domains .
Definition

**1.2.7.1.1**. A connected homogeneous part of a domain structure or of a twinned crystal of phase B is called a domain . Each domain is a single crystal. The part of space ...

Domain states, symmetry states and directional states
Wondratschek, H.,

International Tables for Crystallography
(2011).
Vol. A1,
Section 1.2.7.2,
p.

[ doi:10.1107/97809553602060000791 ]
is a translation and and are klassengleiche subgroups of . Both subgroups have also the same translations because a translation commutes with all translations and thus leaves invariant, see Examples

**1.2.7.3.2** and

**1.2.7.3.3** .
To determine ...

Examples
Wondratschek, H.,

International Tables for Crystallography
(2011).
Vol. A1,
Section 1.2.7.3,
p.

[ doi:10.1107/97809553602060000791 ]
introduction to the subgroups of space groups
The terms just defined shall be explained in a few examples. In Example

**1.2.7.3.1** a translationengleiche transition is considered; i.e. is a translationengleiche subgroup ...

Application to domain structures
Wondratschek, H.,

International Tables for Crystallography
(2011).
Vol. A1,
Section 1.2.7,
p.

[ doi:10.1107/97809553602060000791 ]
these concepts classify the domains and will be defined in the next section and applied in different examples of phase transitions in Section

**1.2.7.3** .

**1.2.7.2**. Domain states, symmetry states and directional states
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