Investigation of a new willemite-type compound, (Li, Na, H)0.16Zn1.92SiO4

A new willemite-type compound, [(Li, Na, H)0.16Zn1.92SiO4)] was synthesized from both solid-state reactions and molten NaCl. X-ray single crystal and neutron powder diffraction studies indicate the presence of Li+, Na+, and H+ in four and six membered-ring channels of alternately arranged ZnO4 and SiO4. The presence of channel cations is new to among numerous willemite-variants reported so far. This new configuration is attributed to defects at the Zn-sites. The new willemite-type material can be regarded as a prototype for combined cationic conductors.

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► A new willemite-type compound, (Li, Na, H)0.16Zn1.92SiO4 could be found for the first time.
► X-ray and neutron diffraction studies indicate the presence of Li+, Na+, and H+.
► The presence of these channel cations is attributed to 4% vacancy at Zn sites.
► This material can be regarded as a prototype for combined cationic conductors.