Can secondary dominants be used to tonicize non-diatonic chords?

1. What do secondary dominant chords resolve to?
2. What types of triads can be tonicized by secondary dominants?
3. Can a secondary dominant be a minor chord?

What do secondary dominant chords resolve to?

In jazz harmony, a secondary dominant is any dominant seventh chord which occurs on a weak beat and resolves downward by a perfect fifth. Thus, a chord is a secondary dominant when it functions as the dominant of some harmonic element other than the key's tonic and resolves to that element.

What types of triads can be tonicized by secondary dominants?

The triads that can be tonicized are III, iv, v, VI and VII. Like in major, there is one place where the secondary V triad is just a regular triad in the key: in minor keys it is the V/III, which is just the diatonic triad VII.

Can a secondary dominant be a minor chord?

We've determined that our secondary dominant is E Major. Remember that a secondary dominant chord won't be a chord in the tonic key. Since we are in D Major, triad built on E would result in a naturally occurring E Minor chord.