Abstract The crystal structures of the M 2 NaIO 6 series ( M = Ca, Sr, Ba), prepared at 650 °C by ceramic methods, were determined from conventional laboratory X‐ray powder diffraction data. Synthesis and crystal growth were made by oxidizing I – with O 2 (air) to I 7+ followed by crystal growth in the presence of NaF as mineralizator, or by the reaction of the alkali‐metal periodate with the alkaline‐earth metal hydroxide. All three compounds are insoluble and stable in water. The barium compound crystallizes in the cubic space group Fm3m (no. 225) with lattice parameters of a = 8.3384(1) Å, whereas the strontium and calcium compounds crystallize in the monoclinic space group P 2 1 / c (no. 14) with a = 5.7600(1) Å, b = 5.7759(1) Å, c = 9.9742(1) Å, β = 125.362(1)° and a = 5.5376(1) Å, b = 5.7911(1) Å, c = 9.6055(1) Å, β = 124.300(1)°, respectively. The crystal structure consists of either symmetric (for Ba) or distorted (for Sr and Ca) perovskite superstructures. Ba 2 NaIO 6 contains the first perfectly octahedral [IO 6 ] 5– unit reported. The compounds of the ortho ‐periodates are stable up to 800 °C. Spectroscopic measurements as well as DFT calculations show a reasonable agreement between calculated and observed IR‐ and Raman‐active vibrations.

Frank Kubel

Nicole Wandl

Mariana Pantazi

Vincenza D'Anna

Hans Hagemann

Zeitschrift für anorganische und allgemeine Chemie

ZAAC is an international scientific journal which publishes original papers on new relevant research results from all areas of inorganic chemistry, solid state chemistry, and co-ordination chemistry.

The contributions reflect the latest findings in these research areas and serve the development of new materials, such as super-hard materials, electrical superconductors, or intermetallic compounds. Up-to-date physical methods for the characterization of new chemical compounds and materials are also described.

The "Zeitschrift für Anorganische und Allgemeine Chemie" is an international scientific journal that publishes original papers on new and relevant research findings from all areas of inorganic chemistry, solid state chemistry, and coordination chemistry. The contributions reflect the latest discoveries in these research fields and contribute to the development of new materials, such as super-hard materials, electrical superconductors, and intermetallic compounds. Additionally, up-to-date physical methods for characterizing new chemical compounds and materials are also described.

《Zeitschrift für Anorganische und Allgemeine Chemie》是一本国际科学期刊，专注于无机化学、固态化学和配位化学领域的原创研究论文。期刊发表的文章反映了这些研究领域的最新发现，并推动新材料的发展，例如超硬材料、电超导体或金属间化合物。此外，期刊还描述了用于表征新化合物和材料的最新物理方法。

Category	Quartile
化学	4
化学, 无机化学与核化学	4

The Periodate‐Based Double Perovskites M₂NaIO₆ (M = Ca, Sr, and Ba)

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Category	Quartile
CHEMISTRY, INORGANIC & NUCLEAR	4

The Periodate‐Based Double Perovskites M2NaIO6 (M = Ca, Sr, and Ba)

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The Periodate‐Based Double Perovskites M₂NaIO₆ (M = Ca, Sr, and Ba)