Synthesis of Thin Cr3Se4 Films from Modulated Elemental Reactants via Two Amorphous Intermediates: A Detailed Examination of the Reaction Mechanism

M Behrens, Wolff-Ragnar Kiebach, W Bensch, D Haussler, W Jager

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The reaction of Cr/Se multilayers when they are annealed occurs in two steps:  interdiffusion of the single layers to an amorphous Cr−Se alloy and crystallization of Cr3Se4. Both reaction steps were characterized using various techniques. At approximately 300 °C the layers have interdiffused completely to form a homogeneous amorphous Cr−Se alloy. Short-range order in the alloy was probed with X-ray absorption spectroscopy (XAS) and, according to the results of this, is already very similar to Cr3Se4, which crystallizes around 500 °C. Crystallization occurs at a well-defined temperature, whereas crystallite growth proceeds in the whole temperature interval above the crystallization temperature and is not finished at 660 °C. The reaction yields a polycrystalline thin film of Cr3Se4 in a preferred orientation exhibiting a (00l) texture. In Cr-rich samples amorphous Cr is present as a by-product. A Cr−Se/Se multilayer was observed as an intermediate in the interdiffusion of some Cr-rich samples which is stable between 200 and 250 °C.
Original languageEnglish
JournalInorganic Chemistry
Volume45
Issue number6
Pages (from-to)2704
ISSN0020-1669
DOIs
Publication statusPublished - 2006
Externally publishedYes

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