Growth of Pure and Intercalated ZrTe2, TiTe2 and HfTe2 Dichalcogenide Single Crystals by Isothermal Chemical Vapor Transport

TL;DR

This paper introduces an isothermal chemical vapor transport (ICVT) method for growing large, high-quality pure and intercalated ZrTe2, TiTe2, and HfTe2 dichalcogenide single crystals, differing from traditional gradient-based CVT techniques.

Contribution

The study presents a novel ICVT technique for crystal growth that simplifies the process and yields larger, more homogeneous crystals compared to conventional methods.

Findings

Crystals up to 15 mm in size were successfully grown.

Crystals exhibited excellent crystallinity and homogeneity.

The method is effective for both pure and intercalated dichalcogenides.

Abstract

We report on a modified chemical vapor transport (CVT) methodology for the growth of pure and intercalated Zr, Ti, and Hf dichalcogenide single crystals, e.g. ZrTe2, Gd0.05ZrTe2, HfTe2, and Cu0.05TiTe2. While the most common method for CVT growth is carried out in quartz tubes subjected to a temperature gradient between the charge and the growth location, the growth using this isothermal-CVT (ICVT) method takes place isothermally in sealed quartz tubes placed horizontally in box furnaces, using iodine (I2) as the transport agent. The structure and composition of crystals were determined by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and induced coupling plasma (ICP). The crystals grown with this method can be large, and show excellent crystallinity and homogeneity. Their morphology is plate-like, and the larger dimensions can be as long as 15 mm.