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Author

Volker Kahlenberg

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Open access Sep 2026

Synthesis and solid-state characterization of RbNaCaSi4O10 – the first phase in the quaternary system Rb2O–Na2O–CaO–SiO2

Abstract Crystal growth involving the devitrification of glasses in the system Rb2O–Na2O–CaO–SiO2, prepared by quenching from 1,400 °C, was performed at 750 °C. The experiments resulted in the formation of the first known crystalline rubidium sodium calcium silicate, with a composition of RbNaCaSi4O10. Powder X-ray dif...

Volker Kahlenberg, E. Libowitzky · 0 citations
Open access Sep 2026

From mystery to modulation: the structural story of Rb2[Si2O5].

The crystal structure of Rb2[Si2O5], a phyllosilicate with previously questionable structural details, has been solved and refined as an incommensurately modulated phase in (3 + 1)-dimensional superspace. This paper describes the monoclinic structure in superspace group C2/c(0β0)s0 with unit-cell parameters a = 9.8662 ...

C. Hejny, Volker Kahlenberg, H. Krüger · 0 citations
Open access Aug 2026

Structural investigations on Rb2Ca2Si8O19 – a double-layer sheet silicate in the system Rb2O–CaO–SiO2

Abstract Single crystals of a previously unknown rubidium calcium silicate with composition Rb2Ca2Si8O19 have been successfully grown by annealing a stoichiometric glass at 1,000 °C for 2 days. The highly crystalline product was characterized by powder and single-crystal X-ray diffraction. The basic crystallographic da...

Volker Kahlenberg · 0 citations

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