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A(II)GeTeO6 (A = Mn, Cd, Pb): Non-Centrosymmetric Layered Tellurates with PbSb2O6-Related Structure
Sun Woo Kim1, Zheng Deng2, Shuang Yu2
1Department of Chemistry and Chemical Biology, Rutgers , 610 Taylor Road, Piscataway, New Jersey 08854, United States.
Abstract:
A(II)GeTeO6 (A = Mn, Cd, Pb), new non-centrosymmetric (NCS) honeycomb-layered tellurates, were synthesized and characterized. A(II)GeTeO6 (A = Mn, Cd, Pb) crystallize in trigonal space group P312 (No. 149) of edge-sharing Ge4+O6 and Te6+O6 octahedra, which form honeycomb-like-layers in the ab-plane with A(II) (A = Mn, Cd, Pb) cations located between the layers. Their crystal structures are PbSb2O6-related, and the ordering of Ge4+ and Te6+ in octahedral environment breaks the inversion symmetry of the parent PbSb2O6 structure. The size of A(II) cation in six coordination is an important factor to stabilize PbSb2O6-based structure. Temperature-dependent optical second harmonic generation measurements on A(II)GeTeO6 confirmed non-centrosymmetric character in the entire scanned temperature range (0 to 600 °C). The materials exhibit a powder SHG efficiency of ∼0.37 and ∼0.21 times of KH2PO4 for PbGeTeO6 and CdGeTeO6, respectively. Magnetic measurements of MnGeTeO6 indicate anti-ferromagnetic order at TN ≈ 9.4 K with Weiss temperature of -22.47 K.
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