Melilite-type blue chromophores based on Mn3+ in a trigonal-bipyramidal coordination induced by interstitial oxygen

Tae Gon Kim, Seung Joo Kim, Chun Che Lin, Ru Shi Liu, Ting Shan Chan, Seoung Jae Im

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


A new, earth-abundant, environmentally benign, and stable inorganic blue chromophore series Sr2(Mg1-xMnx)Ge 2O7+δ has been prepared and characterized by X-ray absorption spectroscopy, synchrotron X-ray diffraction, and ab initio total energy calculation. As the content of Mn in the compound was increased, the color changed from white (for x = 0.0) to sky blue, deep blue, and finally black body color (for x = 1.0). Sr2MgGe2O7 has the melilite-type structure comprising Mg(2+)O4 and GeO4 tetrahedra. On the other hand, it was found that the Mn ion in Sr 2(Mg1-xMnx)Ge2O7+δ is mainly trivalent and that the additional oxygen atom infiltrates into the lattice to compensate for the excess positive charge. The additional oxygen atom occupies an interstitial site, leading to the formation of Mn(3+)O5 trigonal bipyramid and Ge(4+)O5 square pyramid. As the driving force for the Mn(3+)O5 formation, the tendency for improving the lattice coherency between BO4-B′O4 and AO8 layers in the melilite A2BB′2O7 is suggested.

Original languageEnglish
Pages (from-to)5843-5848
Number of pages6
JournalJournal of Materials Chemistry C
Issue number37
Publication statusPublished - Oct 7 2013
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry


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