Effect of CeO2 buffer layer thickness on the structures and properties of YBCO coated conductors

Li, Meiya; Zhao, Xingzhong; Ma, Beihai; Dorris, S. E.; Maroni, V.A.

doi:10.1016/j.apsusc.2007.02.186

Cited by 10 publications

(6 citation statements)

References 25 publications

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“…After having found the optimal temperature value T = 700 °C, an accurate investigation has been carried out by growing CeO 2 buffer layers with different the oxygen partial pressure in the interval P O2 = [10,360] mTorr. For the purpose of evaluating the epitaxial degree of deposited CeO 2 films through XRD q-2q diffraction scan analysis, the parameter a = I(200)/[I(200)+I(111)]as been defined.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, the large mismatch between MgO and YBCO lattice parameters (d MgO = 0.42 nm, a(b)-axis d YBCO = 0.38 nm) requires an additional buffer layer in order to improve the epitaxial growth reducing the grain boundary mis-orientation angle and consequently improving the YBCO superconducting properties [10]. Furthermore, it has been extensively reported that after deposition, due to its hygroscopic nature, the MgO surface tends to quickly deteriorate by arranging bonds with H 2 O and C and constituting Mg(OH) 2 and MgCO 3 compounds.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

et al. 2013

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The study of high quality YBa 2 Cu 3 O 7-x (YBCO) based superconducting films is a fundamental issue to be addressed when dealing with the realization of efficient coated conductors with large current carrying capacity. In this perspective the investigation of innovative buffer layers structures able to allow epitaxial YBCO film grow on metallic substrates and to prevent contamination and degradation issues holds a central role.In this work we thoroughly study the properties of YBCO films grown by means of pulsed lasers deposition on CeO 2 template on both bare MgO single crystal and MgOhomoepitaxial/MgO single crystal substrates. Due to its high chemical and temperature stability the MgO reduces the oxygen diffusion effects. On the other hand, the CeO 2 layer, pulsed laser deposited, prevents the YBCO film from metallic contamination and facilitates its epitaxial growth. Morphology and crystalline structure of buffer layers and superconductors film are investigated by using scanning electron microscopy (SEM), X-ray and electrons back-scattered diffraction techniques (XRD and EBSD).YBCO films show good critical temperature values (Tc > 87K) with sharp transitions. These encouraging results make our structures promising candidates in the realization of high quality YBCO based coated conductors.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

et al. 2013

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“…The thickness and growth temperature of the CeO 2 layer, which grows with a 45 • in-plane tilt compared to the YBCO a/b-axes, were determined based on our previous optimizations and relevant literature. The aim was to maximize the crystalline quality and surface smoothness of the layer while ensuring complete coverage of the underlying YBCO layer [40]. The set of multilayer films were deposited with a 308 nm XeCl excimer laser at 750 • C alternately using YBCO and CeO 2 targets by applying the desired number of laser pulses with fluence of 1.6 J cm −2 and rate of 5 Hz.…”

Section: Methodsmentioning

confidence: 99%

Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal

Tuomola,

Rivasto,

Aye

et al. 2023

J. Phys.: Condens. Matter

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The eﬀect of multilayering YBa2Cu3O6+x (YBCO) thin ﬁlms with sequentially deposited CeO2 layers between YBCO layers grown on buﬀered metallic template is investigated to optimize the self-ﬁeld critical current density J c(0). We have obtained that the improvement in J c(0) clearly depends on the YBCO layer thickness and temperature, where at high temperature J c(0) can be increased even 50 % when compared with the single layer YBCO ﬁlms. Based on our experimental results and theoretical approach to the growth mechanism during multilayer deposition, we have deﬁned a critical thickness for the YBCO layer, where the maximal self-ﬁeld J c(0) is strongly related to the competing issues between the uniform and nonuniform strain relaxation and the formation of dislocations and other defects during the ﬁlm growth. Our results can be directly utilized in the future coated conductor technology, when maximizing the overall in-ﬁeld J c(B) by combining both the optimal crystalline quality and ﬂux pinning properties typically in bilayer ﬁlm structures.

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“…There is no clear explanation of the processes occurring during spray pyrolysis deposition; however, four modes, for the deposition and decomposition processes, may be distinguished and these have been studied elsewhere [35,38]. Moreover, biaxially textured MgO can be grown on non-textured metallic tapes by the inclined substrate deposition (ISD) technique [39,40] using ebeam evaporation [41][42][43][44] for the fabrication of coated superconductor wires [45].…”

Section: Introductionmentioning

confidence: 99%

Spray pyrolysis of MgO templates on Hastelloy C276 and 310-austenitic stainless steel substrates for Y Ba₂Cu₃O₇(YBCO) deposition by pulsed laser deposition

Khateeb¹,

Button²,

Abell³

2010

Supercond. Sci. Technol.

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MgO thin films were deposited on Hastelloy C276 (HC) and 310 austenitic stainless steel by the spray pyrolysis technique, using magnesium nitrate and magnesium acetate as precursors. Thermogravimetrical analysis of the decomposition of the precursors was used to provide a guideline temperature for the thin film deposition. It was suggested that an amorphous MgO thin film was deposited on both 310-stainless steel and Hastelloy C-276 when using low concentration of the magnesium nitrate precursor. Higher concentrations were needed to obtain (200) oriented MgO films on C276. However, 310-stainless steel was found to not be a suitable substrate for MgO thin film deposition due to surface instability. A (200) oriented MgO thin film was grown on Hastelloy C276 using a magnesium acetate precursor at a much lower concentration compared to the nitrate precursor. The characterization of the thin films was done using scanning electron microscopy, x-ray photoelectron spectroscopy, atomic force microscopy, x-ray diffraction 2θ -scans, rocking curves (ω-scans), and pole figure measurements. MgO was found to have a very weak in-plane texture.

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Effect of CeO2 buffer layer thickness on the structures and properties of YBCO coated conductors

Cited by 10 publications

References 25 publications

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal

Spray pyrolysis of MgO templates on Hastelloy C276 and 310-austenitic stainless steel substrates for Y Ba₂Cu₃O₇(YBCO) deposition by pulsed laser deposition

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Effect of CeO2 buffer layer thickness on the structures and properties of YBCO coated conductors

Cited by 10 publications

References 25 publications

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

Experimental Design and Investigation of Novel Pulsed Laser Deposited Structures for YBCO Based Coated Conductors

Defining optimal thickness for maximal self-field Jc in YBCO/CeO2 multilayers grown on buffered metal

Spray pyrolysis of MgO templates on Hastelloy C276 and 310-austenitic stainless steel substrates for Y Ba2Cu3O7(YBCO) deposition by pulsed laser deposition

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Defining optimal thickness for maximal self-field Jc in YBCO/CeO₂ multilayers grown on buffered metal

Spray pyrolysis of MgO templates on Hastelloy C276 and 310-austenitic stainless steel substrates for Y Ba₂Cu₃O₇(YBCO) deposition by pulsed laser deposition