Thermal expansion characteristics of [NZP], NaZr₂P₃O₁₂-type materials: a review

Thermal expansion data of the compositions belonging to the [NZP] family have been collected and systematically organised. This material has the basic formula NaZr₂P₃O₁₂, and the structural formula [M′₁][M″₂][A₂^VI] [B₃^IV]O₁₂, where M′ and M″ are interstitial sites occupied partially or fully by Na or other substituting ion(s). A or B lattice sites are occupied by Zr and P, respectively, or by possible substituting ions. The different ionic substitutions at various sites in the [NZP] structure have produced a large number of compositions.