KIn0.33IIITe0.67VITe2IVO7: Zirconolite-like Mixed-Valent Metal Oxide with a 3D Framework

Dong Woo Lee; Tae-Hyeong Kim; Jeongmook Lee; Junghwan Park; Jong-Yun Kim; Kang Min Ok; Sang Ho Lim

doi:10.1021/acs.inorgchem.1c01996

KIn_0.33^IIITe_0.67^VITe₂^IVO₇: Zirconolite-like Mixed-Valent Metal Oxide with a 3D Framework

Inorg Chem. 2021 Oct 18;60(20):15091-15095. doi: 10.1021/acs.inorgchem.1c01996. Epub 2021 Sep 29.

Authors

Dong Woo Lee¹, Tae-Hyeong Kim¹, Jeongmook Lee^{1

2}, Junghwan Park^{1

3}, Jong-Yun Kim^{1

2}, Kang Min Ok⁴, Sang Ho Lim^{1

2}

Affiliations

¹ Nuclear Chemistry Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea.
² Department of Radiochemistry and Nuclear Nonproliferation, University of Science and Technology, Daejeon 34113, Republic of Korea.
³ Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
⁴ Department of Chemistry, Sogang University, Seoul 04107, Republic of Korea.

PMID: 34585575
DOI: 10.1021/acs.inorgchem.1c01996

Abstract

We provide the material synthesis method, crystal structure information, and characterization of a novel mixed-valent metal oxide KIn_0.33^IIITe_0.67^VITe₂^IVO₇, closely related to zirconolite (CaZrTi₂O₇), a radioactive waste immobilized material, having a 3D framework. The reported metal oxide containing an alkali-metal cation (K⁺), main-group cation (In³⁺), tellurate, and tellurite has been synthesized as both single crystals and a pure polycrystalline phase through a hydrothermal synthesis method. Single-crystal X-ray diffraction indicates that KIn_0.33Te_2.67O₇ crystallizing in the orthorhombic space group Cmcm (No. 63) reveals a 3D framework structure with a 1D channel consisting of Te/InO₆ octahedra and TeO₄ polyhedra. An interesting transition reaction from KIn_0.33Te_2.67O₇ to KIn(TeO₃)₂ under hydrothermal conditions at 230 °C is discussed.