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High-temperature-phase-transition_final arXiv.pdf (1.87 MB)

High-Temperature-Induced Phase Transitions in Honeycomb Layered Oxides A2Ni2TeO6 (A = Na, K)

preprint
submitted on 07.07.2020 and posted on 08.07.2020 by Josef Rizell, Godwill Mbiti Kanyolo, Titus Masese, Yasmine Sassa, Zhen-Dong Huang

Phase transitions have been surmised as underlying factors behind the exceptional electrochemical, ionic and magnetic functionalities that have catapulted honeycomb layered oxides as superb functional materials. As such, in this study (short communication), we explore temperature elevation as an avenue for inducing phase transitions in honeycomb layered oxides adopting the composition A2M2TeO6 (A = Li, Na, K; M = (transition) metal). X-ray diffraction analyses indicate structural changes occurring in Na2Ni2TeO6 hexagonal lattice (centrosymmetric P63/mcm → accentric P63(22) space group) with increase in temperature, whilst in the potassium homologue (K2Ni2TeO6), the phase transitions entail multiple changes in the lattice (from the initial hexagonal → monoclinic (pseudo-orthorhombic) lattice at intermediate temperatures) which reverts back to its initial hexagonal lattice with further increase in temperatures. This study opens an alternative channel for generating phase transition beside electrochemical alkali (re)insertion.

Funding

National Institute of Advanced Industrial Science and Technology (AIST)

Japan Prize Foundation

Japan Society for the Promotion of Science (JSPS KAKENHI Grant Numbers 19 K15685)

History

Email Address of Submitting Author

titus.masese@aist.go.jp

Institution

National Institute of Advanced Industrial Science and Technology (AIST)

Country

Japan

ORCID For Submitting Author

0000-0001-8694-9839

Declaration of Conflict of Interest

No conflict of interest

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