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Articles de revues sur le sujet « Disorder -Polycrystalline Oxides »

Auteur : Grafiati
Publié le 7 septembre 2023

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1

Vahidi, Hasti, Komal Syed, Huiming Guo, et al. "A Review of Grain Boundary and Heterointerface Characterization in Polycrystalline Oxides by (Scanning) Transmission Electron Microscopy." Crystals 11, no. 8 (2021): 878. http://dx.doi.org/10.3390/cryst11080878.

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Interfaces such as grain boundaries (GBs) and heterointerfaces (HIs) are known to play a crucial role in structure-property relationships of polycrystalline materials. While several methods have been used to characterize such interfaces, advanced transmission electron microscopy (TEM) and scanning TEM (STEM) techniques have proven to be uniquely powerful tools, enabling quantification of atomic structure, electronic structure, chemistry, order/disorder, and point defect distributions below the atomic scale. This review focuses on recent progress in characterization of polycrystalline oxide int
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ZHANG, A. M., H. L. CAI, X. S. WU, Z. H. WANG, and J. GAO. "PHASE SEPARATION INDUCED BY CATION DISORDER IN (La, Y)2/3(Sr, Ca)1/3MnO3." International Journal of Modern Physics B 25, no. 11 (2011): 1501–9. http://dx.doi.org/10.1142/s0217979211100576.

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Polycrystalline manganite oxides with different A-site cation disorder were synthesized. The hole concentration and average radius of A-site cation are kept unchanged while the A-site cation disorder increases linearly by Y and Sr co-doped in La 2/3 Ca 1/3 MnO 3. All these samples exhibit a paramagnetic insulator to ferromagnetic (FM) metal transition, and the transition temperature T C and T MI decrease while the transition width increases with increasing the A-site cation disorder. T MI is usually 10 K higher than T C for the small cation disorder samples. However, with increasing the cation
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DEAC, I. G., A. VLĂDESCU, I. BALASZ, A. TUNYAGI, and R. TETEAN. "ELECTRICAL AND MAGNETIC BEHAVIOR OF TRANSITION METAL OXIDES Ln0.7A0.3TMO3, Ln= La, Pr; A = Ca, Sr AND TM = Mn, Co." International Journal of Modern Physics B 24, no. 06n07 (2010): 762–69. http://dx.doi.org/10.1142/s0217979210064393.

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We present a detailed magnetic study of the polycrystalline transition metal oxides Ln 0.7 A 0.3 TMO 3, Ln = La , Pr ; A = Ca , Sr and TM = Mn , Co at low temperatures including electrical resistance, magnetization and ac susceptibility measurements. The effect of the A-site and B-site substitutions on the properties of these compounds is discussed. The results of this analysis indicate that the electrical and magnetic behavior of these compounds have some reminiscences of the manganites having similar formula, but the spin disorder and the grain boundary effects control the properties of thes
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Marinov, Georgi, Biliana Georgieva, Marina Vasileva, and Tsvetanka Babeva. "Study of Structure, Morphology and Optical Properties of Cobalt-Doped and Co/Al-co-Doped ZnO Thin Films Deposited by Electrospray Method." Applied Sciences 13, no. 17 (2023): 9611. http://dx.doi.org/10.3390/app13179611.

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A versatile electrospray method was utilized for deposition of thin ZnO films doped with Co (5%) (CZO) or co-doped with Co (2.5%) and Al (2.5%) (CAZO). Thin polycrystalline films with approximate thickness of 200 nm and high transmittance (more than 80%) were obtained. No additional XRD peaks due to dopant impurities or dopant oxides were observed. The cobalt doping led to decrease in grain size and increase in crystallite size from 22 nm to 29 nm in the (101) direction. Smaller changes were observed for the CAZO films. Surface roughness of the films was measured using a 3D optical profiler. S
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Han, Zhiyong, and Zhenzhu Jing. "The Low Temperature Specific Heat of Pr0.65Ca0.35MnO3." Advances in Condensed Matter Physics 2014 (2014): 1–4. http://dx.doi.org/10.1155/2014/394296.

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The low temperature specific heat of polycrystalline perovskite-type Pr0.65Ca0.35MnO3manganese oxide has been investigated experimentally. It is found that the low temperature electron specific heat in zero magnetic field is obviously larger than that of ordinary rare-earth manganites oxide. To get the contribution of phonon to the specific heat precisely, the lattice specific heat is calculated by Debye model fitting. Results confirm that the low temperature specific heat of Pr0.65Ca0.35MnO3is related to the itinerant electrons in ferromagnetic clusters and the disorder in the sample.
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Cohen, Oded, and Zvi Ovadyahu. "1/f NOISE NEAR THE METAL-INSULATOR TRANSITION." International Journal of Modern Physics B 08, no. 07 (1994): 897–903. http://dx.doi.org/10.1142/s0217979294000440.

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The 1/f noise level in polycrystalline indium oxide thin films and of zinc oxide accumulation layers is found to be much higher than that usually observed in metals. A systematic study of the flicker noise properties in these systems reveals a correlation between the 1/f noise magnitude and the proximity of the system to the insulating phase. In fact, the noise appears to increase dramatically close to the Anderson transition but when the average transport properties exhibited by the system are still diffusive. For static disorder that exceeds the critical value characterized by KFl≃1 the syst
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Guillén, Cecilia. "Polycrystalline WO3−x Thin Films Obtained by Reactive DC Sputtering at Room Temperature." Materials 16, no. 4 (2023): 1359. http://dx.doi.org/10.3390/ma16041359.

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Tungsten oxide thin films have applications in various energy-related devices owing to their versatile semiconductor properties, which depend on the oxygen content and crystalline state. The concentration of electrons increases with intrinsic defects such as oxygen vacancies, which create new absorption bands that give rise to colored films. Disorders in the crystal structure produce additional changes in the electrical and optical characteristics. Here, WO3−x thin films are prepared on unheated glass substrates by reactive DC sputtering from a pure metal target, using the discharge power and
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OKUDA, TETSUJI, RYOICHI KAJIMOTO, MARIO OKAWA, and TOMOHIKO SAITOH. "EFFECTS OF HOLE-DOPING AND DISORDER ON THE MAGNETIC STATES OF DELAFOSSITE CuCrO2 HAVING A SPIN-3/2 ANTIFERROMAGNETIC TRIANGULAR SUBLATTICE." International Journal of Modern Physics B 27, no. 05 (2013): 1330002. http://dx.doi.org/10.1142/s0217979213300028.

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In this review, we will discuss the effects of itinerant hole and disorder produced by substitutions on the magnetic states of polycrystalline delafossite oxide CuCrO 2 having a spin-3/2 antiferromagnetic triangular sublattice. First, we will show the effects of hole-doping by the substitution of nonmagnetic Mg 2+ for magnetic Cr 3+ on the physical properties of CuCrO 2, and will discuss the origin of nontrivial promotion of the 120° Néel state due to the coupling between the itinerant hole and localized spin. Next, we will show the effects of disorder introduced by the isovalent substitutions
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Zhang, Jiahui, Xujun Su, Yutao Cai, et al. "Atomic-resolved structural and electric field analysis of the passivation interface of MIS-HEMTs." AIP Advances 12, no. 4 (2022): 045111. http://dx.doi.org/10.1063/5.0087659.

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The passivation interfaces of GaN-based MIS-HEMTs with Si3N4 and ZrO2/Si3N4 bilayers were investigated through atomic resolution scanning transmission electron microscope–energy dispersive spectroscopy–differential phase contrast microscopy methods. It is found that the Si3N4/GaN interface exhibits atomic disorder fluctuation, and the GaN surface is discontinuous at the depth of 1–2 atomic layers. An oxide layer of ∼2 nm is formed at the ZrO2/GaN interface, and the GaN surface is atomically flat. Furthermore, the local minimum of the potential is located at the Si3N4/GaN interface, while it is
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Maaoui, B., Y. Aoun, S. Benramache, A. Nid, R. Far, and A. Touati. "Synthesis and Characterization of Physical Properties of the NiO Thin Films by Various Concentrations." Advances in Materials Science 20, no. 3 (2020): 79–87. http://dx.doi.org/10.2478/adms-2020-0017.

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AbstractIn this work, nickel oxide was deposited on a glass substrate at by spray deposition technique; the structural, optical and electrical properties were studied at different NiO concentrations (0.05, 0.10 and 0.15 mol.l−1). Polycrystalline NiO films with a cubic structure with a strong (111) preferred orientation were observed at all sprayed films with minimum crystallite size of 11.97 nm was attained of deposited film at 0.1 mol.l−1. However, α-Ni(OH)2 was observed at 0.15 mol.l−1. The NiO thin films have good transparency in the visible region, the band gap energy varies from 3.54 to 3
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Rossi, Zaid, Bilal Brioual, Abdesamad Aouni, Mustapha Diani, and Mohammed Addou. "Microstructural, morphological and optical properties of sprayed thin films of indium doped gadolinium oxide (Gd2O3: In)." E3S Web of Conferences 336 (2022): 00041. http://dx.doi.org/10.1051/e3sconf/202233600041.

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This paper featured a study on undoped and Indium doped Gadolinium oxide Gd2O3: In thin films, elaborated on a glass substrates at temperature of 500 °C by homemade Spray Pyrolysis technique, at different Indium concentrations as follow 0, 2, 4, 6 and 8 at %. This thin layers, where a subjects to a numerous characterization techniques to study the effect caused by introducing the dopant element “Indium” in Gadolinium oxide lattice on the structural properties (X-Ray Diffraction and Raman spectroscopy) and optical properties. The structural characterization carried by the X-ray diffraction (XRD
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12

Fedotova, J. A. "Electric properties of black arsenic." Doklady of the National Academy of Sciences of Belarus 66, no. 1 (2022): 26–34. http://dx.doi.org/10.29235/1561-8323-2022-66-1-26-34.

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R(T, B) of the natural black arsenic (b-As) polycrystal was studied. It was shown that the polycrystalline b-As sample contains the b-As phase and also the traces of its oxide, as well as grey arsenic and arsenolite (As2O3). The behavior of the relative magnetoresistance of the b-As crystal was described by the relation MR(B) = bBn + cBm, where the coefficients b and c and the exponents n and m were also affected by the mechanisms of magnetoresistance formation and temperature. At the temperatures below 10 K, MR(B) shows the presence of a competition between negative (with b < 0 and n ≈ 0.5
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Žurauskienė, Nerija. "Engineering of Advanced Materials for High Magnetic Field Sensing: A Review." Sensors 23, no. 6 (2023): 2939. http://dx.doi.org/10.3390/s23062939.

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Advanced scientific and industrial equipment requires magnetic field sensors with decreased dimensions while keeping high sensitivity in a wide range of magnetic fields and temperatures. However, there is a lack of commercial sensors for measurements of high magnetic fields, from ∼1 T up to megagauss. Therefore, the search for advanced materials and the engineering of nanostructures exhibiting extraordinary properties or new phenomena for high magnetic field sensing applications is of great importance. The main focus of this review is the investigation of thin films, nanostructures and two-dim
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14

Jaramillo Palacio, J. A., K. A. Muñoz Pulido, J. Arbey Rodríguez, D. A. Landínez Téllez, and J. Roa-Rojas. "Electric, magnetic and microstructural features of the La2CoFeO6 lanthanide ferrocobaltite obtained by the modified Pechini route." Journal of Advanced Dielectrics 11, no. 03 (2021): 2140003. http://dx.doi.org/10.1142/s2010135x21400038.

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In the search for new materials with applicable magnetic properties in spintronic devices, the aim of this work is to report the synthesis of the lanthanide ferrocobaltite La2CoFeO6 using the modified Pechini route; the experimental study of structural, morphological and magnetic properties, and the analysis of the electronic structure and bands are obtained in the framework of the Density Functional Theory. Rietveld refinement of experimental X-ray diffraction patterns revealed the crystallization of this oxide material in a perovskite-like monoclinic structure, space group [Formula: see text
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Zhang, Lu, Lixing You, Lei Chen, Wei Peng, and Zhen Wang. "Superconductivity of disordered NbN films deposited on Magnesium Oxide and Oxidized Silicon substrates." Superconductor Science and Technology, August 11, 2022. http://dx.doi.org/10.1088/1361-6668/ac88fd.

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Abstract This study investigates the evolution of superconducting properties as a function of disorder in epitaxial and polycrystalline NbN thin films grown on MgO and SiO2/Si substrates, respectively. By reducing the film thickness from 100 to 4 nm, the effective disorder in these two sets of films encompasses a large range, with the Ioffe-Regel parameter in the range of 5.7–9.3 and 1.5–3.0, respectively. Moreover, the density of states at the Fermi level [N(0)] of epitaxial NbN films decreases from 1.91×1028 to 1.46×1028 states eV−1 m−3 with the superconducting transition temperature (Tc ) r
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Vanderah, David J., Jennifer Arsenault, Hongly La, Vitalii Silin, Curtis W. Meuse, and Richard S. Gates. "Helical, Disordered, and What that Means: Structural Characterization of a New Series of Methyl 1-Thiaoligo(ethylene Oxide) Self-Assembled Monolayers." MRS Proceedings 724 (2002). http://dx.doi.org/10.1557/proc-724-n4.5.

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AbstractSelf-assembled monolayers (SAMs) of a series of linear thiols containing a 1-thiaoligo(ethylene oxide) [TOEO] moiety, i.e., HS(CH2CH2O)xCH3, where x = 3 - 6, were prepared on polycrystalline gold (Au) and characterized by reflection absorption infrared spectroscopy (RAIRS) and spectroscopic ellipsometry (SE). For x = 5 and 6, the RAIRS data show that the TOEO segment, oriented normal to the substrate, adopts the highly ordered 7/2 helical structure of the folded-chain crystal polymorph of poly(ethylene oxide). For x = 3 and 4, the RAIRS and SE data indicate disordered, “amorphous” SAMs
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