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Open AccessReview

Quaternary Misfit Compounds—A Concise Review

Department of Materials and Interfaces, Weizmann Institute, Rehovot 76100, Israel
Author to whom correspondence should be addressed.
Now, Yosef Elion.
Crystals 2020, 10(6), 468;
Received: 21 April 2020 / Revised: 7 May 2020 / Accepted: 9 May 2020 / Published: 1 June 2020
(This article belongs to the Special Issue Synthesis, Structure, and Properties of Inorganic Nanotubes)
Misfit layered compounds (MLCs) have been studied in the literature for the last 40 years. They are generally made of an alternating sequence of two monolayers, a distorted rocksalt structure, and a hexagonal layered compound. In a typical MLC, the c-axis is common to the two monolayers and so is one of the axes in the layer plan. However, the two compounds are non-commensurate along at least one axis, and the ratio between the two axes is an irrational number making the MLC a non-stoichiometric compound. The two main families of MLC are those based on metal dichalcogenides and CoO2 as the hexagonal layered compound. Traditionally, ternary MLCs were prepared and studied, but some quaternary and multinary MLC minerals have been known for many years. Over the last few years, interest in MLCs with four and even larger number of atoms has grown. Doping or alloying of a ternary MLC permits precise control of the charge carrier density and hence the electrical, thermoelectric, catalytic, and optical properties of such compounds. In this short review, some of these developments will be discussed with the main emphasis put on quaternary MLC nanotubes belonging to the chalcogenide series. The synthesis, structural characterization, and some of their properties are considered. Some recent developments in quaternary cobaltite MLCs and recent studies on exfoliated MLCs are discussed as well. View Full-Text
Keywords: misfit compounds; inorganic nanotubes; metal dichalocgenides; cobaltites misfit compounds; inorganic nanotubes; metal dichalocgenides; cobaltites
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Aliev, S.B.; Tenne, R. Quaternary Misfit Compounds—A Concise Review. Crystals 2020, 10, 468.

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