Formation of metastable phases of ferrous sulfide via pulsed Nd:YAG laser deposition: Experimental and theoretical study
作者： Tomáš Křenek , Rostislav Medlín , Stefan Karatodorov , Valentin Mihailov , Michal Pola
DOI: 10.1016/J.JALLCOM.2017.06.229
关键词: Sulfide 、 High-resolution transmission electron microscopy 、 Marcasite 、 Materials science 、 Mineralogy 、 Pyrite 、 Thin film 、 Scanning electron microscope 、 Orthorhombic crystal system 、 Analytical chemistry 、 Electron diffraction
摘要: Abstract Highly polymorphic ferrous sulfide exhibits attractive optical, semiconducting, magnetic and biocatalytic properties related to its phase modification. Nd:YAG laser ablation of (FeS) in vaccum results noncongruent deposition nanostructured FeS 1-x thin films. Deposits have been carried out on Ta, Al Cu substrates achieved films were analyzed using scanning electron microscopy (SEM), high resolution transmission (HRTEM) diffraction order characterize morphology, chemical composition transformation induced by ablative process. Round-shaped ring-like particles, shapeless agglomerates as well flat discontinuous areas observed for all the coats deposited various substrates. However, HRTEM, agreement with diffraction, different compositions detected. Cubic pyrite (FeS 2 ) has detected Ta substrate. Metastable rhombohedral smythite Fe 9 S 11 cubic found And , metastable orthorhombic marcasite 2m revealed The crystalline nanograins deposits surrounded amorphous phase. Furthermore, gain deep insight into electronic structure obtained stable (cubic pyrite) less known unstable phases (orthorhombic smythite) density functional theory is employed important characteristics such band gap values calculated.
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