Highly tenebrescent hackmanites from natural nepheline

: Agamah, Cecilia; Vuori, Sami; Mäkilä, Ermei; Peuronen, Anssi; Lastusaari, Mika

Publisher: Royal Society of Chemistry (RSC)

: CAMBRIDGE

: 2025

: Dalton Transactions

: DALTON T

: 54

: 21

: 8445

: 8451

: 7

: 1477-9226

: 1477-9234

DOI: https://doi.org/10.1039/d5dt00389j

: https://doi.org/10.1039/d5dt00389j

: https://research.utu.fi/converis/portal/detail/Publication/498608430

Photochromic hackmanites, (Na,K)8Al6Si6O24(Cl,S)2, were synthesized with a solid state reaction route using natural nepheline, (Na,K)AlSiO4, as a starting material together with NaCl, KCl and Na2SO4. The hackmanite was obtained using NaCl, whereas with KCl the nepheline reacted only partially. In particular, materials synthesized with NaCl showed a deep photochromic color under UV irradiation and good sensitivity to even low solar UV index values. This suggests that the material is well suited for personal solar UV exposure monitoring.

d5dt00389j.pdf