Structure can be very complex

Staging

(classical model)

(Daumas-Hrold model)

In-plane Structure

• very important: to know the in-plane structure = to know the crystal structure

• usually very complex

superlattices

commensurate/incommensurate

liquid-like organization

order/disorder transitions

multiphase, multidomain

• most in-plane structures are average models or idealized assumptions

  ---

Host Structure

Highly stoichimetric TiS₂: synthesized directly from elements