Startseite High-Temperature Synthesis, Crystal Structure, and Properties of the New Sodium Rare-Earth Oxide Borates Na2RE2(BO3)2O (RE = Dy, Ho)
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High-Temperature Synthesis, Crystal Structure, and Properties of the New Sodium Rare-Earth Oxide Borates Na2RE2(BO3)2O (RE = Dy, Ho)

  • Gunter Heymann , Konstantin Beyer und Hubert Huppertz
Veröffentlicht/Copyright: 24. Februar 2022
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Abstract

The new monoclinic oxide borates Na2RE2(BO3)2O (RE = Dy, Ho) were synthesized using standard solid-state reactions in the temperature range 900 - 950 C. They are isotypic to the known phases Na2RE2(BO3)2O (RE = Y, La, Nd, Sm-Gd, Er). The single crystal X-ray structure determination of Na2Dy2(BO3)2O revealed: P21/c, a = 1063.9(1), b = 626.2(1), c = 1025.3(1) pm, β = 117.76(1), Z = 4, R1 = 0.0221, wR2 = 0.0402 (all data). The corresponding lattice parameters of Na2Ho2(BO3)2O determined from powder data are a = 1061.2(5), b = 623.7(2), c = 1022.5(3) pm, and β = 117.7(1). The structure consists of infinite sheets of REO8-polyhedra in the bc-plane, which are seperated by sodium atoms. The BO3-groups are isolated forming layers in the bc-plane. The results of IR-spectroscopic investigations, temperature-resolved in-situ powder-diffraction measurements, and DTA/TG measurements on Na2Dy2(BO3)2O are also presented.

Published Online: 2022-02-24
Published in Print: 2004-12-01

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