Occurrences in Chords
The dominant seventh chord in root position contains a (d5) tritone within its pitch construction: it occurs between the third and seventh above the root. In addition, augmented sixth chords, some of which are enharmonic to dominant seventh chords, contain tritones spelled as augmented fourths (for example, the German sixth, from A to D♯ in the key of A minor); the French sixth chord can be viewed as a superposition of two tritones a major second apart.
The diminished chord also contains a tritone in its construction, deriving its name from the diminished fifth interval (i.e. a tritone). The half-diminished seventh chord contains the same tritone, while the fully diminished seventh chord is made up of two superposed tritones a minor third apart.
Other chords built on these, such as ninth chords, often include tritones (as diminished fifths).
Read more about this topic: Tri-tone, Common Uses
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