On the role of ambient oxygen in the formation of lead titanate pulsed laser deposition thin films

Chaoui, N.; Millon, Éric; Müller, Jean-François; Ecker, Paul; Bieck, W.; Migeon, Henri Noël

doi:10.1016/s0169-4332(98)00403-6

Cited by 27 publications

(8 citation statements)

References 8 publications

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“…During oxide film growth by PLD, the oxygen incorporation can be controlled by the oxygen pressure PO 2 . 24,25 In addition, it has been shown 26 that the effect of increasing the laser power density is similar to that of decreasing PO 2 . This means that the ratio between the flux of cations (J C ) coming from the target and oxygen species (J O ) coming from the ambient gas is an important parameter governing the incorporation of oxygen in the films and therefore the composition and the thickness of films.…”

Section: Resultsmentioning

confidence: 91%

Phase separation in nanocomposite indium tin oxide thin films grown at room temperature: on the role of oxygen deficiency

et al. 2012

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A phase separation is found to occur at room temperature in oxygen deficient indium tin oxide films. This disproportionation reaction is driven by the crystallization of the stoichiometric (In 1.8 Sn 0.2 )O 3 phase as indium tin sub-oxides are not thermodynamically stable. The electrons supplied by the oxygen vacancies may act as reduction centres to induce the formation of metallic In and/or Sn atoms, and when the phase separation is complete, a nanocomposite film is formed with metallic clusters embedded in a stoichiometric oxide matrix. The precise study of the role of oxygen deficiency shows the existence of a threshold in oxygen composition for the occurrence of the phase separation. Indeed for nearly stoichiometric (In 1.8 Sn 0.2 )O x films (with x > 2.75) metallic clusters are not present, while for x < 2.75, metallic clusters are observed. The existence of this threshold is here explained in relation to classical nucleation theory. An analogy is proposed between the critical size leading to the nucleation of metallic clusters and the threshold in oxygen composition.

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Section: Resultsmentioning

confidence: 91%

Phase separation in nanocomposite indium tin oxide thin films grown at room temperature: on the role of oxygen deficiency

et al. 2012

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“…Studies of the PLD oxide film growth 29 have shown that the oxygen incorporation can be controlled by the oxygen pressure and/or the laser power density. 30 Widely oxygen deficient indium tin oxide films were thus obtained in this work by PLD under vacuum (10 -7 mbar) and high laser power density (10 8 W/cm 2 ).…”

Section: Results and Interpretationsmentioning

confidence: 99%

Formation of metallic nanoclusters in oxygen deficient indium tin oxide films

Perrière

Hébert

Petitmangin

et al. 2011

Journal of Applied Physics

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International audienceThe composition, structure, microstructure, and properties of indium tin oxide films grown by pulsed laser deposition at room temperature and under vacuum were studied. The films are highly nonstoichiometric, with about 20% oxygen deficiency, and present a semiconductor behavior between 300 and 15 K, followed by a superconducting transition at about 7 K related to the presence of In or In-Sn nanoclusters embedded in a stoichiometric indium tin oxide matrix, i.e., nanocomposite films are formed by the phase separation of oxygen deficient metastable indium tin oxide. The solid-liquid and liquid-solid phase transitions of the metallic nanoclusters were evidenced by resistivity measurements in the 300 to 450 K range. The films grown at room temperature are partially crystallized. Actually, stoichiometric indium tin oxide crystallites are observed in the as grown films. After thermal treatment (< 450 K), both stoichiometric indium tin oxide crystallites and the tetragonal phase of the metallic In are observed in the nanocomposite films. The size of nanoclusters (from 5 to 30 nm), which depends on the thermal treatments and crystallization, and the microstructure of the nanocomposite films were confirmed by HRTEM measurements. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3596578

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“…Nevertheless, the high temperature (550°C) of the platinum substrate and control of oxygen pressure (30 Pa) are required to obtain the perovskite structure without the pyrochlore phase. 1,2 A previous study demonstrated that molecular characterization of lead titanate by laser ablation mass spectrometry (LAMS) is not easy because most of the detected ions are produced by complex gas-phase reactions. 3 Indeed, the study of PbTiO 3 ceramic powder or a PbO-TiO 2 stoichiometric mixture led to the detection of similar species.…”

Section: Introductionmentioning

confidence: 99%

Characterization of lead–titanium–oxygen compounds by static SIMS

Aubriet

Poleunis

Bertrand

2002

Surface & Interface Analysis

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and Pb x Ti x ,O y +/− ionic species generated by 15 keV Ga + primary ion bombardment analysed by ToF-SIMS allowed the identification of the involved metal-oxygen system. The detection of Pb x Ti x ,O y +/− mixed metal ions was specific to lead titanate (film and powder). Indeed, these species were not observed when the PbO-TiO 2 stoichiometric mixture was examined. Consequently, they allowed unambiguous molecular identification of the Pb-Ti-O investigated system.

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On the role of ambient oxygen in the formation of lead titanate pulsed laser deposition thin films

Cited by 27 publications

References 8 publications

Phase separation in nanocomposite indium tin oxide thin films grown at room temperature: on the role of oxygen deficiency

Phase separation in nanocomposite indium tin oxide thin films grown at room temperature: on the role of oxygen deficiency

Formation of metallic nanoclusters in oxygen deficient indium tin oxide films

Characterization of lead–titanium–oxygen compounds by static SIMS

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