Perovskite La1-xSrxFeO3 Thin Films Deposited by Laser Ablation Process

Cyza, A.; Cieniek, Łukasz; Kopia, Agnieszka

doi:10.1515/amm-2016-0179

Cited by 8 publications

(6 citation statements)

References 20 publications

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“…Subsequently, the perovskite structure either produced an Fe 4+ ion, which is a B-site element having higher valence state, or an oxygen hole. 4,18–20 Because the Fe 4+ ion radius (0.0585 nm) is less than the Fe 3+ ion radius (0.0645 nm), the cell became still smaller in size. When x = 0.2, the diffraction peaks (141) and (311) appear as a merged peak (141).…”

Section: Resultsmentioning

confidence: 99%

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Lin

Yang

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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Background: The nanocrystalline structure of La 1-x Ca x FeO 3 was prepared by a sol-gel method involving an autocombustion process. The incorporation of rare-earths in LaFeO 3 induces strain in magnetic properties, especially in terms of the following parameters: replacement amount, oxygen partial pressure, and calcination temperature. Methods: To determine the effects of the amount of Ca 2+ ion doping agent and the calcination temperature on the microstructure, particle morphology, and magnetic properties of LaFeO 3 crystal, we performed the following respective analytical methods: X-ray powder diffraction, Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy, and vibrating sample magnetometer tests. Results: The orthorhombic structure of LaFeO 3 perovskite did not change even when it was doped with Ca 2+ ions, and its space group continued to be Pnma (No.62). FT-IR spectra confirmed that the main band appearing at 568 cm −1 is due to the antisymmetric stretching vibration of Fe-O-Fe bonds in FeO 6 . The introduction of Ca inhibits the growth of grains but the morphology of particles is improved. With an increasing concentration of Ca 2+ ions, magnetic behavior of the samples also witnessed an increasing trend in a proportionate manner. With an increase in calcination temperature, the enclosed area of the magnetic hysteresis curve of the sample reduced remarkably. Conclusions: The growth of nanoparticles can be restrained with an increase of Ca content that is used as doping agent. The magnetic behavior of La 1-x Ca x FeO 3 tilts towards G-type antiferromagnetism; the magnetic orientation is achieved from the super exchange interaction of Fe 3+ ions with oxygen ions.

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Section: Resultsmentioning

confidence: 99%

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Lin

Yang

et al. 2018

Journal of Applied Biomaterials & Functional Materials

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“…Increase in volume was also detected when x = 0.7, which may be related to many factors, including internal stress, oxygen vacancy, the effects of surface energy and surface stress [3,16]. According to the Scherrer's formula, particle size gets reduced, until the doping amount reaches 0.7, after which they tend to increase in size [5,6]. Fig.…”

Section: Xrd Analysismentioning

confidence: 99%

“…Perovskite-type (ABO3) rare-earth metal oxide [1,2] is a kind of new inorganic non-metal material that possesses unique physical and chemical properties. Lanthanum ferrite composite oxide nanopowder (LaFeO3) are nanoscale particles of a material [3,4], which possess unique magnetic, optical and electrical properties, that can be attributed to the congregation of multifactorial effects, such as small size effect, surface effect [5,6]. The properties of these nanoparticles may sometimes vary from the macro-scale material itself [7,8].…”

Section: Introduction mentioning

confidence: 99%

Microstructure and Magnetic Studies of La1-xSrxFeO3 Nano Particles Fabricated by the Citrate Sol-Gel Method

Yang¹,

Yang²,

Lin³

et al. 2019

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The paper reports the use the sol-gel auto-combustion method for the preparation of nanocrystalline La1-xSrxFeO3 (x = 0¸0.7). The physical and chemical properties, microstructure, morphology and magnetic properties of the particles thus formed were studied. The X-ray diffraction (XRD) results indicated that Sr2+ instead of perovskite La are attributed to the lattice forming solid solution La1-xSrxFeO3, which has single orthogonal perovskite structure, space group Pnma, and does not show any impurity peaks. Fourier-transform infrared (FT-IR) spectroscopy confirmed the presence of Fe-O-Fe bond antisymmetric stretching vibration of FeO6 regular octahedron. The scanning electron microscope (SEM) analysis showed that introduction of Sr2+ ions can inhibit the growth of size of the particles thereby forming particles with spherical shape and better dispersion properties. The magnetic properties of the sample showed that with increase in Sr2+ ion concentration leads to increase in sample’s magnetism. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.19455

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“…For example, doping is one of the suitable methods. [89][90][91] How to do the doping is the primary question. Typically, researchers choose the A and B sites for doping.…”

Section: Structural Characterizationmentioning

confidence: 99%

Perovskite Oxide Ferroelectric Thin Films

Tian

Yang

2022

Adv Elect Materials

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be roughly divided into perovskite-type, lithium niobate type, tungsten bronze type, potassium dihydrogen phosphate type, triglycine sulphate type, Rochelle salt, ferroelectric liquid crystal, and ferroelectric polymer. Among these ferroelectric thin film materials, perovskite ferroelectric films and ferroelectric polymer films are relatively well-studied films. The outstanding ductility and flexibility of ferroelectric polymer films like polyvinylidene fluoride (PVDF) have made them popular in flexible electrical devices. [7][8][9] However, some disadvantages of ferroelectric polymer films, such as low polarization strength, large coercive field, slow switching speed, and poor temperature resistance limit their application in fields including ferroelectric memory, piezoelectric energy harvesting or sensors. [10][11][12] To apply them to these fields, they need to be appropriately combined with perovskite oxide materials to improve their ferroelectric properties. For example, some researchers doped 0.5((Ba 0.7 Ca 0.3 )TiO 3 )-0.5(Ba(Zr 0.2 Ti 0.8 ) O 3 ) (BCZT) ceramic particles into PVDF to make BCZT/PVDF composite film. PVDF is a semicrystalline ferroelectric polymer, doping it with BCZT improves its crystallinity and hence its dielectric constant. The dielectric constants of the γ-PVDF phase and α-PVDF phase in pure PVDF films are ≈10 and 7.5. After doping with BCZT, the dielectric constants increase to 31 and 20, which improves the ferroelectric properties of PVDF. [13] There are many other examples of enhancing the ferroelectric properties of PVDF films by doping with perovskite oxides. [14][15][16][17][18][19][20] Obviously, enhancing the ferroelectric properties of PVDF by this method will make the preparation process relatively tedious and is not conducive to mass production. It is not as convenient as growing perovskite ferroelectric films directly on flexible substrates. In addition, polymers' poor temperature resistance limits their utilization compared to ferroelectric oxide thin film materials' superior temperature resistance and physical properties. The composite dielectric film composed of BiFeO 3 (BFO) and SrTiO 3 (STO) has a reversible energy storage density (U e ) of about 70 J cm −3 at room temperature and can operate stably between −60 and 100 °C. [21] BaZr 0.35 Ti 0.65 O 3 (BZT) has a U e of 78.7 J cm −3 at room temperature and can work stably between −150 and 200 °C, and the U e still exceeds 40 J cm −3 at 200 °C. [22] But polymer-based ferroelectric materials often cannot be applied at high temperatures and have a low energy storage density (<40 J cm −3 ). [23,24] The high temperature special design can meet the temperature requirements, but the dielectric properties need more optimization. [25,26] The spontaneous polarization of BaTiO 3 (BTO) is about 25 µC cm −2 , [27] and the spontaneous polarization of stress-modulated BTO Perovskite oxide thin film materials are used in various fields of human life due to their excellent physical properties. The high performance thin films in turn prov...

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Perovskite La1-xSrxFeO3 Thin Films Deposited by Laser Ablation Process

Cited by 8 publications

References 20 publications

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

Microstructure and Magnetic Studies of La1-xSrxFeO3 Nano Particles Fabricated by the Citrate Sol-Gel Method

Perovskite Oxide Ferroelectric Thin Films

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Perovskite La1-xSrxFeO3 Thin Films Deposited by Laser Ablation Process

Cited by 8 publications

References 20 publications

The influence of Ca substitution on LaFeO3 nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO3 nanoparticles in terms of structural and magnetic properties

Microstructure and Magnetic Studies of La1-xSrxFeO3 Nano Particles Fabricated by the Citrate Sol-Gel Method

Perovskite Oxide Ferroelectric Thin Films

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The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties

The influence of Ca substitution on LaFeO₃ nanoparticles in terms of structural and magnetic properties