Fabrication of TlBa₂CaCu₂O₇c‐Axis Oriented Films Through a Hybrid In‐Situ MOCVD Process

Abstract

The first procedure for a novel, hybrid, in-situ, MOCVD synthesis of superconducting TlBaCaCuO thin films on 10 mm 10 mm (100) LaAlO 3 substrates is reported. X-ray diffraction (XRD) studies, scanning electron microscopy (SEM) images, and energy dispersive X-ray (EDX) analyses have shown the selective growth of epitaxial TlBa 2 CaCu 2 O 7 (Tl-1212) films. The XRD patterns indicate that samples are highly c-axis oriented, and the (103) pole figure points to a good in-plane alignment. SEM images show highly homogeneous, smooth surfaces with a plate-like structure.

Calcium Copper−Titanate Thin Film Growth: Tailoring of the Operational Conditions through Nanocharacterization and Substrate Nature Effects

“…The multicomponent precursor source consists of a homogeneous mixture of Ca(hfa) 2 ·tetraglyme, Cu(tmhd) 2 , and Ti(tmhd) 2 (O -i Pr) 2 [Htmhd = 2,2,6,6-tetramethyl-3,5-heptandione; O -i Pr = isopropoxide; Hhfa = 1,1,1,5,5,5-hexafluoro-2,4-pentanedione; tetraglyme = 2,5,8,11,14-pentaoxapentadecane] in a 1:1:3 stoichiometric ratio. Although we already reported on both Ca and Cu precursors characterization, , and the Ti precursor has been widely investigated, , the comparative study of all the individual precursors and an accurate characterization of the molten multicomponent mixture remains essential to test the real potentialities for this specific application. Thus, the thermal behaviors of Ca(hfa) 2 ·tetraglyme, Cu(tmhd) 2 , and Ti(tmhd) 2 (O -i Pr) 2 individual precursors and of the Ca:Cu:Ti 1:1:3 mixture have been investigated by thermogravimetric (TG) measurements and differential scanning calorimetry (DSC).…”

Synthesis and characterization of La2–xBaxCuO4+δ thin film through a simple MOCVD approach

“…[17][18][19][20] The thermal properties of individual La(hfa) 3 diglyme, Ba(hfa) 2 tetraglyme and Cu(tmhd) 2 precursors have been previously investigated. 18,25 The three adducts are thermally stable and the TG curves indicate that they vaporize intact in a single step independently from the pressure used in the experiments. Nevertheless, the characterization of the multi-component mixture is a crucial step for this specific application.…”