Self-regulated growth of LaVO3 thin films by hybrid molecular beam epitaxy

Zhang, Haitian; Dedon, Liv R.; Martin, Lane W.; Engel‐Herbert, Roman

doi:10.1063/1.4922213

Cited by 44 publications

(54 citation statements)

References 39 publications

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“…It was clear that LnCrO 3 resulted from the reactions between the as-prepared Ln(OH) 3 and Cr from the substrates. As a consequence,…”

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confidence: 99%

“…• C for 12 h, LnCrO 3 appeared in the coatings accompanied by the unreacted La(OH) 3 (or Nd 2 O 3 ). It was clear that LnCrO 3 resulted from the reactions between the as-prepared Ln(OH) 3 and Cr from the substrates.…”

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confidence: 99%

“…Moreover, during heat-treatment elements from the substrates may diffuse outward to react with the as-prepared Ln-M coatings. Therese et al 26 prepared Ln(OH) 3 (Ln = La, Nd) coatings on stainless steel substrates. It was shown that after heating at 950…”

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confidence: 99%

“…Perovskite coatings with the general formula, LnMO 3 (Ln = rare earth metal; M = transition metal or Al) are of considerable interests for numerous technological applications, such as catalysis, 1,2 novel electronic devices, 3 and high temperature corrosion protection of metals. 4,5 Conventional techniques for the preparation of perovskite coatings include pulsed laser deposition, 3,6 molecular beam epitaxy, 7 chemical vapor deposition, 8 sputtering and sol-gel method, 9,10 which are capital intensive and difficult for scale production.…”

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confidence: 99%

“…4,5 Conventional techniques for the preparation of perovskite coatings include pulsed laser deposition, 3,6 molecular beam epitaxy, 7 chemical vapor deposition, 8 sputtering and sol-gel method, 9,10 which are capital intensive and difficult for scale production. Electrodeposition of Ln-M coatings from aqueous solutions followed by heat-treatment is an advantageous method for preparing perovskite coatings.…”

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Preparation of La-Cr Perovskite Coating Using Electrodeposition Method

Zhang

You

Luo

et al. 2016

J. Electrochem. Soc.

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An adhesive LaCrO 3 perovskite coating has been prepared on stainless steel substrate by cathodic electrodeposition from aqueous solution 0.03 M La(CH 3 COO) 3 + 0.03 M CrCl 3 + 0.03 M Na 3 C 6 H 5 O 7 , followed by heat-treatment at 800 • C in air. The electrodeposition of La-Cr coatings has been examined in the solution with pH of 2∼3 at the current density of 1∼5 mA cm −2 . It is shown that the change of pH by even 0.1 can affect obviously the deposition of La-Cr coatings, and increasing the current density will lead to the generation of more cracks in the coatings. A more uniform and compact La-Cr coating can be obtained in the solution with the optimized pH value of 2.7 at the optimized current density of 1 mA cm −2 . The La and Cr deposits change from their metallic states to the hydroxides during electrodeposition, corresponding to the increase in the pH with time. The as-prepared La-Cr coating is rich in La, due to the strong coordination of trivalent chromium with complex agent in the bath. The outward diffusion of Cr from the stainless steel substrate supplies the as-prepared La-rich coating to form LaCrO 3 during heat-treatment. which are capital intensive and difficult for scale production. Electrodeposition of Ln-M coatings from aqueous solutions followed by heat-treatment is an advantageous method for preparing perovskite coatings. [11][12][13][14][15] This method offers a more economical and efficient technique for the fabrication of perovskite coatings. Nevertheless, although the Ln-M coatings have been successful prepared using both anodic and cathodic electrodeposition methods, relevant research is still limited and challenging.Matsumoto et al [11][12][13] conducted a series of research on the anodic electrodeposition of Ln-M (M = Co, Mn) coatings. Their studies indicated that Ln ions did not participate in any oxidation reactions. The incorporation of Ln ions into the M hydroxide/oxide coatings was achieved by enriching the bath with Ln ions and their consequent adsorption. This gives poor control over the Ln contents in the coatings and requires a high concentration of Ln ions for deposition. 15By comparison, cathodic electrodeposition is an inherently superior technique as both Ln and M ions participate in the reactions, leading to facile deposition of Ln and M elements. 14 However, the cathodic electrodeposition of Ln-M coatings still faces some problems. The main obstacle stems from the low equilibrium potentials of Ln ions. Since the equilibrium potentials of Ln ions (Ln 3+ + 3e -→Ln; E 0 = -2.52 ∼-2.25 V SHE ) are much more negative than that of water (2H 2 O + 4e -→2OH -+ H 2 ; E 0 = -0.828 V SHE ), electrolytic decomposition of water appears preferentially.16,17 Fortunately, electrodeposition of Ln elements can be achieved by adding some complex agents to shift their evolution potentials to more positive values. 18,19 Lokhande et al 20 investigated the electrodeposition of La from aqueous solutions on different substrates and found that sodium citrate was a suitable complex agent for L...

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“…It was clear that LnCrO 3 resulted from the reactions between the as-prepared Ln(OH) 3 and Cr from the substrates. As a consequence,…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Preparation of La-Cr Perovskite Coating Using Electrodeposition Method

Zhang

You

Luo

et al. 2016

J. Electrochem. Soc.

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Molecular Beam Epitaxy for Oxide Electronics

Prakash

Jalan

2019

Molecular Beam Epitaxy

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Unleashing Strain Induced Ferroelectricity in Complex Oxide Thin Films via Precise Stoichiometry Control

Haislmaier

Grimley

Biegalski

et al. 2016

Adv Funct Materials

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Strain tuning has emerged as a powerful means to enhance properties and to induce otherwise unattainable phenomena in complex oxide fi lms. However, by employing strain alone, the predicted properties sometimes fail to emerge. In this work, the critical role of precise stoichiometry control for realizing strain-induced ferroelectricity in CaTiO 3 fi lms is demonstrated. An adsorption controlled growth window is discovered for CaTiO 3 fi lms grown by hybrid molecular beam epitaxy, which ensures an excellent control over the Ti:Ca atomic percent ratio of <0.8% in the fi lms. Superior ferroelectric and dielectric properties are found for fi lms grown inside the stoichiometric growth window, yielding maximum polarization, dielectric constant, and paraelectric-toferroelectric transition temperatures. Outside this growth window, properties are severely deteriorated and ultimately suppressed by defects in the fi lms. This study exemplifi es the important role of precise compositional control for achieving strain-induced properties. Untangling the effects of strain and stoichiometry on functional properties will accelerate both fundamental discoveries yet to be made in the vast materials design space of strained complex oxide fi lms, as well as utilization of strain-stabilized phenomena in future devices.

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Self-regulated growth of LaVO3 thin films by hybrid molecular beam epitaxy

Cited by 44 publications

References 39 publications

Preparation of La-Cr Perovskite Coating Using Electrodeposition Method

Preparation of La-Cr Perovskite Coating Using Electrodeposition Method

Molecular Beam Epitaxy for Oxide Electronics

Unleashing Strain Induced Ferroelectricity in Complex Oxide Thin Films via Precise Stoichiometry Control

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