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Artykuły w czasopismach na temat „Doped Perovskite Manganites”

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Data publikacji: 6 września 2023

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1

De Sousa, P., N. Panwar, I. Bdikin, A. L. Kholkin, C. M. Fernandes i A. M. R. Senos. "Effect of the Grain Size on the Magnetic Phase Separation in La0.8Sr0.2MnO3 by Magnetic Force Microscopy". Microscopy and Microanalysis 18, S5 (sierpień 2012): 101–2. http://dx.doi.org/10.1017/s1431927612013165.

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Perovskite manganites have been the focus of worldwide research during the last two decades because of the observation of colossal magnetoresistance (CMR) effect. These materials have potential applications in magnetic field sensors, spin filters, infrared bolometers and cathodes for solid oxide fuel cells. Such manganites are also important from the fundamental study viewpoint as they offer interplay among various degrees of freedom viz. spin, lattice and charge ordering. Moreover, phase separation may occur in manganites with low concentration of the dopant. In such scenario, ferromagnetic metallic clusters are embedded in antiferromagnetic insulating matrix. The fraction of these magnetic phases may vary from the nano- to micro-scale. With higher dopant concentration, the percolation of these magnetic metallic clusters leads to the apparent CMR effect. In this study we focus our attention to the low doped La0.8Sr0.2MnO3 (LSMO) manganite and investigate the possible magnetic phase separation and effect of variation in grain size on the magnetic domain size. La0.8Sr0.2MnO3 possesses Curie temperature (TC) higher than room temperature, therefore the material is supposed to be in the magnetic state at room temperature.
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2

MODI, ANCHIT, RAJESH THAKUR, RASNA THAKUR, N. K. GAUR, N. KAURAV i G. S. OKRAM. "STRUCTURAL PROPERTIES OF CHROMIUM DOPED GADOLINIUM MANGANITES". International Journal of Modern Physics: Conference Series 22 (styczeń 2013): 511–16. http://dx.doi.org/10.1142/s2010194513010593.

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The Systematic investigation of structural behaviour of GdMn1-xCrxO3 (x=0, 0.1, 0.2) has been undertaken which are synthesized by conventional solid state reaction method. All the XRD reflection lines were successfully indexed according to orthorhombic perovskite structure with space group: pbnm (62). Upon chromium (Cr) doping on the Mn site the unit cell volume has reduced due to slight difference between the ionic radii of Cr 3+ and Mn 3+ compare with Pure GdMnO 3. The relation between lattice parameter infer that all the samples have O´ type orthorhombic structure which is highly distorted perovskite structure but increasing the Cr concentration the orthorhombic distortion decrease that deduce the non John Teller nature of these samples.
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3

Rizzuti, Anotnio, Massimo Viviani, Anna Corradi, Paolo Nanni i Cristina Leonelli. "Microwave-Assisted Hydrothermal Synthesis as a Rapid Route Towards Manganite Preparation". Solid State Phenomena 128 (październik 2007): 21–24. http://dx.doi.org/10.4028/www.scientific.net/ssp.128.21.

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In this work attempts to prepare strontium-doped lanthanum manganites La1-xSrxMnO3 using microwave-assisted hydrothermal synthesis were undertaken from a mixture of lanthanum nitrate, strontium nitrate, manganese(II) nitrate, potassium permanganate and potassium hydroxide as a mineralizer. For x = 0.3, and x = 0.5, the perovskite obtained is not defined since both La0.7Sr0.3MnO3 and La0.5Sr0.5MnO3 phases are consistent with XRD spectra. While with x = 1.0, for the first time, hexagonal strontium manganite was prepared as blade-shaped crystallites with a narrow particle length distribution (range 3.75-7.75 μm) at 210°C using a treatment time of only 1 hour. Conventional hydrothermal synthetic routes require at least 24 hrs treatment time.
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4

Chik, A., S. Saad, R. M. Zaki, F. Che Pa i C. K. Yeoh. "Ab Initio Calculations of Electronic Properties of Al Doped LaMnO3 Perovskite Manganites". Applied Mechanics and Materials 754-755 (kwiecień 2015): 762–65. http://dx.doi.org/10.4028/www.scientific.net/amm.754-755.762.

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The electronic structure of the perovskite manganites LaMnO3 and La2/3 Al1/3 MnO3 was presented. The calculations were made within density functional theory (DFT) and PBE exchange correlations energy approximation. It was found that inclusion of Al dopants add additional states near the Fermi level and decreasing the resistivity values for all temperature range.
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5

Rizzuti, Antonino, i Cristina Leonelli. "Microwave advantages in inorganic synthesis of La0.5 Sr0.5MnO3 powders for perovskite ceramics". Processing and Application of Ceramics 3, nr 1-2 (2009): 29–32. http://dx.doi.org/10.2298/pac0902029r.

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In this work the advantage of the use of the microwave technology was exploited for the preparation of perovskite ceramics. Microwave-assisted hydrothermal method has been applied to the preparation of strontium-doped lanthanum manganites with different stoichiometric ratio of the three oxides, La1-x SrxMnO3 (x = 0.3, 0.5, 0.6). In particular, pure black narrow dispersed crystallites of La0.5Sr0.5MnO3 of 0.68?0.18 ?m were prepared in only 45 minutes at 240?C and a KOH concentration of 21 M. The complete chemical, mineralogical and microstructural characterization of the powders reveal the same structural properties of the perovskite powders previously synthesised by ceramic and conventional hydrothermal routes. .
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6

Moritomo, Y., T. Akimoto, A. Nakamura, K. Ohoyama i M. Ohashi. "Antiferromagnetic metallic state in the heavily doped region of perovskite manganites". Physical Review B 58, nr 9 (1.09.1998): 5544–49. http://dx.doi.org/10.1103/physrevb.58.5544.

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7

Autret, C., C. Martin, M. Hervieu, A. Maignan, B. Raveau, G. André, F. Bourée i Z. Jirak. "From A-type antiferromagnetism to ferromagnetism in half-doped perovskite manganites". Journal of Magnetism and Magnetic Materials 270, nr 1-2 (marzec 2004): 194–202. http://dx.doi.org/10.1016/j.jmmm.2003.08.018.

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8

Troyanchuk, I. O., L. S. Lobanovsky, D. D. Khalyavin, S. N. Pastushonok i H. Szymczak. "Magnetic and magnetotransport properties of Co-doped manganites with perovskite structure". Journal of Magnetism and Magnetic Materials 210, nr 1-3 (luty 2000): 63–72. http://dx.doi.org/10.1016/s0304-8853(99)00620-4.

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9

Maignan, A., C. Martin, M. Hervieu, B. Raveau i J. Hejtmanek. "Probing the underlying charge ordering: Ruthenium-doped Sm1−xSrxMnO3 perovskite manganites". Journal of Applied Physics 89, nr 4 (15.02.2001): 2232–36. http://dx.doi.org/10.1063/1.1342188.

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10

Liu, Shao-Peng, Yan Xie, Juan Xie i Gui-De Tang. "Structural and magnetic properties of self-doped perovskite manganites La0.8-xSr0.2MnO3−δ". Journal of Applied Physics 110, nr 12 (15.12.2011): 123714. http://dx.doi.org/10.1063/1.3671635.

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11

Kumar, Manoj, Usha Chandra i G. Parthasarathy. "High pressure electrical resistivity behaviour on nano-crystalline vacancy doped perovskite manganites". Materials Letters 60, nr 17-18 (sierpień 2006): 2066–68. http://dx.doi.org/10.1016/j.matlet.2006.02.001.

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12

Wu, Jian. "Magnetoresistance Effects for the Inhomogeneous Perovskite System of Ag Doped La0.833Na0.167MnO3". Applied Mechanics and Materials 110-116 (październik 2011): 553–58. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.553.

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The transport properties of the inhomogeneous system (1/4) Ag2O-La0.833Na0.167MnO3(LNMO/Ag) have been systematically studied. X-ray diffraction patterns show that the LNMO/Ag sample is the two-phase composite and consists of a magnetic La0.833Na0.167MnO3(LNMO) perovskite phase and a nonmagnetic Ag metal phase. The resistivity of the sample decreases dramatically with Ag added into the pure perovskite LNMO manganites. For the LNMO/Ag sample, the Curie temperatureTCis 331 ± 2 K and slightly higher than that of the LNMO sample (323 ± 2 K). Due to the dope of Ag metal, the room temperature magnetoresistance effect is enhanced significantly (from 7% for the pure LNMO manganites to 23% for the LNMO/Ag sample under a relative lower field of 0.5 T and from 37.5% for the LNMO sample to 41 % for the LNMO/Ag sample under a high field of 6 T at the temperature of 330 K. In the low temperature regime, the magnetoresistance ratio of the LNMO/Ag sample is smaller than that of the LNMO sample, which is contrary to the magnetoresistance effect in high temperature. The effects are discussed qualitatively by use of a model which is based on the relative change among the intrinsic magnetoresistance effect and the extrinsic magnetoresistance effect.
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13

Kurbakov, A. I., C. Martin i A. Maignan. "Electron-doped Sm1−xSrxMnO3 perovskite manganites: Crystal and magnetic structures and physical properties". Journal of Magnetism and Magnetic Materials 321, nr 17 (wrzesień 2009): 2601–6. http://dx.doi.org/10.1016/j.jmmm.2009.03.040.

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14

Sen, Vikram, Neeraj Panwar, G. L. Bhalla i S. K. Agarwal. "Structural, electrical and magnetic properties of Sb-doped Pr2/3Ba1/3MnO3 perovskite manganites". Journal of Alloys and Compounds 439, nr 1-2 (lipiec 2007): 205–9. http://dx.doi.org/10.1016/j.jallcom.2006.04.078.

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15

Tanasescu, S., C. Marinescu i F. Maxim. "Thermodynamic Properties of Nano- and Micro-Structured Perovskite-Type Compounds". Solid State Phenomena 99-100 (lipiec 2004): 117–22. http://dx.doi.org/10.4028/www.scientific.net/ssp.99-100.117.

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The thermodynamic properties of the ABO3 perovskite-type compounds are strongly affected by the A- and B- site substitution and the oxygen nonstoichiometry. The paper presents the thermodynamic properties of some doped nano- and microstructured lanthanum manganites of general formula La1-xMxMn1-yMeyO3 (where M=Sr, Ca; Me=Al; x=0.3;0.33, y=0;0.05) which have been studied within the temperature range of 873-1273 K in a reducing atmosphere (10-6 Pa). The relative partial molar free energies, enthalpies and entropies of oxygen dissolution in the perovskite phase and the equilibrium partial pressures of oxygen have been obtained by using a solid electrolyte galvanic cell method. The influence of the oxygen stoichiometry change on the thermodynamic properties was examined using the data obtained by a coulometric titration technique coupled with measurements of the electromotive force (EMF). The focus of the research was to emphasise modifications of the thermodynamic properties connected with the nanocrystalline state. The results obtained are discussed in relation to significant changes in the overall concentration of defects.
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16

Craus, M. L., N. Cornei i T. L. To. "Low-Doped La0.54Ho0.11Sr0.35Mn1-XVxO3 Manganites: Vanadium Influence on Transport Phenomena and Magnetic Properties". Solid State Phenomena 190 (czerwiec 2012): 85–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.190.85.

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Transport phenomena in manganites (ABO3), and indirectly the transition temperature from metallic to insulator state (TMI), can be controlled by hole doping and the average ionic size at A positions (). In agreement with Zener theory, the strength of double exchange is determined by the Mn-O length (dMnO) and Mn-O-Mn angles () of the Mn-O-Mn bonds. We will investigate the influence of substitution of Mn with V on the crystalline structure and transport characteristics in La0.54Ho0.11Sr0.35Mn1-xVxO3 manganites. The samples were prepared by sol-gel method to improve the purity and homogeneity of the samples. By XRD it was established that the samples contain only ABO3 perovskite phases, except the samples with x0.1. The resistance of the samples vs temperature was determined by four probes method. The specific magnetization was obtained by using a Foner type magnetometer, working at 1.4 T, between 77 and 400 K.
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17

Liu, Jia Wei, Jian Jiang Wang i Hai Tao Gao. "Infrared Emissivities and Microwave Absorption Properties of Perovskite La1-xCaxMnO3 (0≤x≤0.5)". Materials Science Forum 914 (luty 2018): 96–101. http://dx.doi.org/10.4028/www.scientific.net/msf.914.96.

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La1-xCaxMnO3(0≤x≤0.5) with perovskite-type structure has been successfully prepared by sol-gel method as a microwave and infrared multi-functional material. The effects of Ca incorporation on the stucture, electrical conductivity, infrared emissivity and microwave-absorbing properties were investigated in detail by XRD, 4-point probes resistivity measurement system,IR-2 infrared-emissivity analyzer and vector network analyzer. XRD results show that the perovskite structure of LaMnO3 is hardly changed when the doping concentration (x) of Ca2+ is less than or equal to 0.5. The incorporation of Ca in LaMnO3 leads to the decrease of electrical conductivity, while the infrared emissivities are decreased. Moreover, microwave-absorbing properties in the frequency range of 2-18 GHz are sensitive to Ca content. The optimal reflection loss calculated from the measured permittivity and permeability is 42 dB at 10.5 GHz with a thickness of 2.0 mm when the doping amount of Ca2+ is 0.1. It is possible to make Ca-doped lanthanum manganites achieve compatible camouflage capability for radar and infrared wave-band.
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18

Gao, H.-J., C. L. Chen, X. Fan, M. Kim, S. Y. Chen, C. W. Chu i S. J. Pennycook. "Atomic Structure of La067Ca0.33MnO3 Thin Films on LaAlO3". Microscopy and Microanalysis 6, S2 (sierpień 2000): 402–3. http://dx.doi.org/10.1017/s1431927600034504.

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Thin films of doped perovskite manganites of the type R1-X AxMnO3-y are currently become the focus of intense theoretical and experimental research due to their promising technological implications. However, the microstructure of the film and the interface structure at the atomic level remains unclear. In this report, we will present the atomic structure of the film/substrate interface and the microstructure of the film using a combination of transmission electron microscopy (TEM), Z-contrast scanning transmission microscopy (STEM), and electron energy loss spectroscopy (EELS).The La0.67Ca0.33MnO3 (LCMO) samples were grown on (001) LaA1O3 (LAO) using pulsed laser deposition. X-ray diffraction indicated the films to be oriented with the [001] directions parallel to the <001> directions of the pseudo-cubic perovskite LAO. Rocking curve measurements using the (002) reflection from the film indicated a full width half maximum of less than 0.3°. A Philips EM-400 electron microscope at 100 kV and a VG HB603 STEM at 300 kV were employed for sample analysis.
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19

Gunanto, Yohanes Edi, K. Sinaga, B. Kurniawan, S. Poertadji, H. Tanaka, T. Ono, E. Steven i J. S. Brooks. "Transition Insulator-Metal and Antiferromagnetic-Paramagnetic Cu Doped in La0.47Ca0.53MnO3". Advanced Materials Research 1123 (sierpień 2015): 73–77. http://dx.doi.org/10.4028/www.scientific.net/amr.1123.73.

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The study of the perovskite manganites La0.47Ca0.53Mn1-xCuxO3 with x = 0, 0.06, 0.09, and 0.13 has been done. The magnetic structure was determined using high-resolution neutron scattering at room temperature and low temperature. All samples were paramagnetic at room temperature and antiferromagnetic at low temperature. Using the SQUID Quantum Design, the samples showed that the doping of the insulating antiferromagnetic phase La0.47Ca0.53MnO3 with Cu doping resulted in the temperature transition from an insulator to metal state, and an antiferromagnetic to paramagnetic phase. The temperature transition from an insulator to metal state ranged from 23 to 100 K and from 200 to 230 K for the transition from an antiferromagnetic to paramagnetic phase.
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20

Jeong, Yeong Seung, M. S. Anwar, Faheem Ahmed, Seung Rok Lee i Bon Heun Koo. "Study of Magnetic Transition and Magnetocaloric Effect in La1-xSrxMnO3 (0.20≤ x ≤0.35) Compounds". Applied Mechanics and Materials 378 (sierpień 2013): 225–29. http://dx.doi.org/10.4028/www.scientific.net/amm.378.225.

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We report the magnetic transition and large magnetic entropy change in Sr doped lanthanum manganites. Polycrystalline La1-xSrxMnO3(0.20x0.35) samples were prepared using the conventional solid-state reaction method. The results of X-ray diffraction indicates perovskite phase without any impurity. The magnetic study has revealed that the Curie temperature is influenced by Sr-concentration. The doping of Sr at La site affects the Mn-O bond length and Mn-O-Mn bond angle due to the difference in their ionic radii, consequently, the Curie temperature changed. A large magnetic entropy change has been observed for La0.8Sr0.2MnO3sample, the value of the maximum entropy change (SMmax) increases from 1.42 to 2.74 J/kgK as magnetic field increases from 1 to 2.5 T. This investigation suggests that La1-xSrxMnO3can be used as a potential magnetic refrigeration material.
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Ehi-Eromosele, Cyril O., J. A. O. Olugbuyiro, A. Edobor-Osoh, A. A. Adebisi, O. A. Bamgboye i J. Ojeifo. "Magneto-Structural and Antimicrobial Properties of Sodium Doped Lanthanum Manganite Magnetic Nanoparticles for Biomedical Applications: Influence of Silica Coating". Journal of Biomimetics, Biomaterials and Biomedical Engineering 37 (czerwiec 2018): 117–27. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.37.117.

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Coating of magnetic nanoparticles (MNPs) is usually a requirement prior to their utilization in biomedical applications. However, coating can influence the magneto-structural properties of MNPs thereby imparting their applications. The present work highlights the combustion synthesis of Na-doped lanthanum manganites (LNMO) and the influence of silica coatings on the magneto-structural properties, colloidal stability and antimicrobial properties of LNMO MNPs with their biomedical applications in mind. The crystalline perovskite structure was the same both for the bare and silica coated LNMO samples while there was a slight increase in crystallite size after coating. The FTIR spectral analysis, reduction in agglomeration of the particles and the elemental composition of the coated nanoparticles confirmed the presence of silica. The magnetization values of 34 emu/g and 29 emu/g recorded for bare and coated LNMO samples, respectively show that LNMO MNPs retained its ferromagnetic behaviour after silica coating. The pH dependent zeta potentials of the coated sample is-22.20 mV at pH 7.4 (physiological pH) and-18 mV at pH 5.0 (cell endosomal pH). Generally, silica coating reduced the antibacterial activity of the sample except forBacillussppwhere the antibacterial activity was the same with the bare sample. These results showed that while silica coating had marginal effect on the crystalline structure, size and magnetization of LNMO MNPs, it reduced the antibacterial activity of LNMO MNPs and enhanced greatly the colloidal stability of LNMO nanoparticles. Keywords: Na-doped lanthanum manganites, Silica coating, magnetic nanoparticles, biomedical applications, antimicrobial properties, colloidal stability
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22

ZHANG, JINCANG, YUFENG ZHANG, SHIXUN CAO i CHAO JING. "EFFECT OF MEAN ION SIZE AND SPATIAL SPIN DISORDERS FOR (La1-xYx)2/3Ca1/3MnO3 MANGANITES". International Journal of Modern Physics B 18, nr 26 (30.10.2004): 3451–64. http://dx.doi.org/10.1142/s0217979204026615.

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The structure and transport properties of perovskite ( La 1-x Y x)2/3 Ca 1/3 MnO 3 (0≤x≤0.3) systems are systematically investigated. It is found that all the specimens show a single-phase structure and reveal a direct relationship between the Curie temperature Tc and the average ionic radius <rA> of La site. With increasing Y 3+ doped content, the metal-insulator transition temperature T MI (M-I) shifts to lower temperature. While the relevant resistivity peak ρp is sharp increased, for the specimens with large doping content, x=0.3, it has enhanced eight orders of magnitudes larger than the non-doped samples (x=0.0). At high concentration area, that is to say, when x>0.1, magnetic studies show a gradual increase of antiferromagnetic interaction with an increase of x, ultimately leading to a spatial-spin disorders, that is, spin-glass-like state for x=0.2 and x=0.3 compounds at about 35 K. The results show that it has connected a reduction of Tc and an increase in magnetoresistance with a decrease in the microstructural Mn - O - Mn bond angle.
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23

Maignan, A., C. Martin, F. Damay, B. Raveau i J. Hejtmanek. "Transition from a paramagnetic metallic to a cluster glass metallic state in electron-doped perovskite manganites". Physical Review B 58, nr 5 (1.08.1998): 2758–63. http://dx.doi.org/10.1103/physrevb.58.2758.

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Abdel-Latif, I. A., Adel A. Ismail, M. Faisal, Atif M. Ali, A. E. Al-Salmi i A. Al-Hajry. "Impact of the annealing temperature on perovskite strontium doped neodymium manganites nanocomposites and their photocatalytic performances". Journal of the Taiwan Institute of Chemical Engineers 75 (czerwiec 2017): 174–82. http://dx.doi.org/10.1016/j.jtice.2017.03.030.

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Liu, S. P., G. D. Tang, Z. Z. Li, D. H. Ji, Y. F. Li, W. Chen i D. L. Hou. "Structural and magnetic properties in the self-doped perovskite manganites with nominal composition La0.7Sr0.3−xMnO3−δ". Physica B: Condensed Matter 406, nr 4 (luty 2011): 869–76. http://dx.doi.org/10.1016/j.physb.2010.12.016.

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Ahmiatri, Sitti Saptari, Azwar Manaf i Budhy Kurniawan. "The Influence of Ni-Doping on Structure and Magnetic Properties of La0.67Ba0.33MnO3". Advanced Materials Research 896 (luty 2014): 406–9. http://dx.doi.org/10.4028/www.scientific.net/amr.896.406.

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The hole doped manganites of perovskite structure have attracted great interest in the scientific community because of the rich physical behavior. In this work, we report the influence of Ni-doping on structure and magnetic properties of La0.67Ba0.33Mn1-xNixO3 (x = 0, 0.02, 0.04, and 0.06). Four basic materials La2O3, BaCO3, MnCO3, and NiO are mixed with Planetary Ball Milling during 25 hours, then calcinations on 800°C during 10 hours, compacted, and continued with the process of sintering temperature of 1200°C for 2 hours. Samples were characterized using XRD (X-Ray Diffraction) then refinement by GSAS software. Refinement results showed samples with various x = 0 to x = 0.04 are single phase with monoclinic crystal structure, while the sample with x = 0.06 there are variations in two phases namely monoclinic and hexagonal phases. Magnetic properties of materials La0.67Ba0.33Mn1-xNixO3 characterized by permagraph. Hysteresis loops results showed that the samples La0.67Ba0.33Mn1-xNixO3 are soft magnetic materials, with prices declining saturation with increasing value of x in the sample.
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Abdel-Latif, I. A., Adel A. Ismail, Houcine Bouzid i A. Al-Hajry. "Synthesis of novel perovskite crystal structure phase of strontium doped rare earth manganites using sol gel method". Journal of Magnetism and Magnetic Materials 393 (listopad 2015): 233–38. http://dx.doi.org/10.1016/j.jmmm.2015.05.078.

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Trukhanov, S. V., V. A. Khomchenko, D. V. Karpinsky, M. V. Silibin, A. V. Trukhanov, L. S. Lobanovsky, H. Szymczak, C. E. Botez i I. O. Troyanchuk. "A-site ordered state in manganites with perovskite-like structure based on optimally doped compounds Ln0.70Ba0.30MnO3 (Ln = Pr, Nd)". Journal of Rare Earths 37, nr 11 (listopad 2019): 1242–49. http://dx.doi.org/10.1016/j.jre.2018.12.010.

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Tian, Gao, Cao Shi-Xun, Zhang Jin-Cang, Yu Li-Ming, Kang Bao-Juan i Yuan Shu-Juan. "Nano-sized Domain Wall Pinning Effects in Dilute Cu-Doped Perovskite LaMn 1- x Cu x O 3 Manganites". Chinese Physics Letters 25, nr 9 (wrzesień 2008): 3410–13. http://dx.doi.org/10.1088/0256-307x/25/9/085.

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Singh, Suram, i Devinder Singh. "Structural, magnetic and electrical properties of Fe-doped perovskite manganites La0.8Ca0.15Na0.05Mn1−Fe O3 (x = 0, 0.05, 0.10 and 0.15)". Journal of Alloys and Compounds 702 (kwiecień 2017): 249–57. http://dx.doi.org/10.1016/j.jallcom.2017.01.154.

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Thiyagarajan, R., S. Esakki Muthu, R. Mahendiran i S. Arumugam. "Effect of hydrostatic pressure on magnetic and magnetocaloric properties of Mn-site doped perovskite manganites Pr0.6Ca0.4Mn0.96B0.04O3 (B=Co and Cr)". Journal of Applied Physics 115, nr 4 (28.01.2014): 043905. http://dx.doi.org/10.1063/1.4862810.

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32

Kammoun, Imed, Wissem Cheikhrouhou-Koubaa, Wahiba Boujelben i Abdelwaheb Cheikhrouhou. "Structural and magnetic properties of Bi doped in the A site of (Pr1 − xBix)0.6Sr0.4MnO3 (0 ≤ x ≤ 0.4) perovskite manganites". Journal of Materials Science 43, nr 3 (9.11.2007): 960–66. http://dx.doi.org/10.1007/s10853-007-2194-5.

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33

Pratitajati, Endyas, i Azwar Manaf. "Microstructural Characterisation and Microwave Absorption Characteristics of La(1-x)BaxFe0.25Mn0.5Ti0.25O3 (x = 0, 0.25, 0.75, 1)". Advanced Materials Research 789 (wrzesień 2013): 161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.789.161.

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Perovskite lanthanum manganites, especially those doped LaMnO3 (LMO), have shown potentials for applications in magnetic electronic functional materials. Partial substitution of La ion with divalent ions or Mn ion with trivalent ions gives rise to new properties. Substituted LMO has ability for absorbing electromagnetic waves. In this paper, we report recent investigations on substituted LaMnO3 with designated La(1-x)BaxFe0.25Mn0.5Ti0.25O3 (x= 0, 0.25, 0.75, 1) compositions. Materials were prepared by mechanical alloying technique. After heat treatments at sintering temperatures 1100°C, 1200°C and 1300°C to the quasi-crystalline powders, presence of material phases were confirmed by XRD. Single phase material was obtained in samples of 0.25 x < 0.75 compositions. Mean crystallite size of sintered materials showed that crystallites were in a nanocrystalline regime. It is then concluded, during mechanically alloyed sintering powder materials, solid-state reaction and crystallisation promoted formation of particles containing nanocrystallites. Microwave absorption data showed that materials with large amount of substituted Ba ion gives broad absorption profiles. Total substitution of La by Ba ions (x=1) has significantly changed absorption profile. Smaller mean crystallite sizes indicated an increase in reflection loss value. In this report, empirical relationship between nanostructure and absorption profile of material is discussed.
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34

Chezhina, N. V., i A. V. Fedorova. "Atom states and interatomic interactions in perovskite-like oxides: XXVI. Short order in magnetoresistive lanthanum manganites doped with various diamagnetic elements". Russian Journal of General Chemistry 80, nr 5 (maj 2010): 909–14. http://dx.doi.org/10.1134/s1070363210050075.

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Chezhina, N. V., i A. V. Fedorova. "Atomic states and interatomic interactions in perovskite-like oxides: XXIV. Influence of yttrium atoms on magnetic properties of lanthanum manganites doped with strontium". Russian Journal of General Chemistry 80, nr 2 (luty 2010): 203–6. http://dx.doi.org/10.1134/s1070363210020015.

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36

Choudhary, Nisha, Mukesh Kumar Verma, Narayan Dutt Sharma, Suman Sharma i Devinder Singh. "Correlation between magnetic and transport properties of rare earth doped perovskite manganites La0.6R0.1Ca0.3MnO3 (R = La, Nd, Sm, Gd, and Dy) synthesized by Pechini process". Materials Chemistry and Physics 242 (luty 2020): 122482. http://dx.doi.org/10.1016/j.matchemphys.2019.122482.

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Fedorova, A. V., N. V. Chezhina i K. Yu Sukhenko. "Atom states and interatomic interactions in perovskite-like oxides: XXXV. Magnetic properties of solid solutions of lanthanum manganites doped with ytterbium and calcium in LaAlO3". Russian Journal of General Chemistry 86, nr 7 (lipiec 2016): 1552–57. http://dx.doi.org/10.1134/s1070363216070033.

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38

Chezhina, N. V., A. V. Fedorova i Ya A. Rutskaya. "State of atoms and interatomic interactions in perovskite-like oxides: XXII. Effect of the Ca-Sr ratio on exchange interactions in lanthanum manganites doped with calcium and strontium". Russian Journal of General Chemistry 78, nr 5 (maj 2008): 860–63. http://dx.doi.org/10.1134/s1070363208050034.

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39

Lang, Xueqin, Haiyang Mo, Xiaoying Hu i Hongwei Tian. "Supercapacitor performance of perovskite La1−xSrxMnO3". Dalton Trans. 46, nr 40 (2017): 13720–30. http://dx.doi.org/10.1039/c7dt03134c.

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Sr-doped perovskite manganite La1−xSrxMnO3 materials, which are composed of nanoparticles, possess a meso-scale porous structure with superior electrochemical properties under the mechanism of oxygen intercalation.
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40

Demont, Antoine, i Stéphane Abanades. "High redox activity of Sr-substituted lanthanum manganite perovskites for two-step thermochemical dissociation of CO2". RSC Adv. 4, nr 97 (2014): 54885–91. http://dx.doi.org/10.1039/c4ra10578h.

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41

Zhu, Xia, Meng Zhao, Ju Gao, Yaping Qi, Jiali Zeng i Weiyi Huang. "Field effects on heterojunctions composed with electron-doped La1−xHfxMnO3 and Nb-SrTiO3 perovskites". International Journal of Modern Physics B 31, nr 25 (10.10.2017): 1745008. http://dx.doi.org/10.1142/s0217979217450084.

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Thin films and heterojunctions of Hf[Formula: see text]-doped LaMnO3 manganite have been studied. The sole tetravalent state of Hf[Formula: see text] ensures formation of [Formula: see text]-type La[Formula: see text]Hf[Formula: see text]MnO3 (LHMO) manganite. Photoinduced resistance was also observed as illuminated by visible light. The induced photoresistance (PR) could be greatly enhanced by the compressive strain. The LHMO/Nb-STO heterojunctions showed excellent rectifying characteristics, which are comparable with those [Formula: see text]-junctions of conventional semiconductors. Their transport properties are tunable electrically and magnetically. Such LHMO/Nb-STO heterojunctions have the potential to develop novel functional field-effect transistors based on manganite perovskites.
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42

Ifland, Benedikt, Patrick Peretzki, Birte Kressdorf, Philipp Saring, Andreas Kelling, Michael Seibt i Christian Jooss. "Current–voltage characteristics of manganite–titanite perovskite junctions". Beilstein Journal of Nanotechnology 6 (7.07.2015): 1467–84. http://dx.doi.org/10.3762/bjnano.6.152.

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After a general introduction into the Shockley theory of current voltage (J–V) characteristics of inorganic and organic semiconductor junctions of different bandwidth, we apply the Shockley theory-based, one diode model to a new type of perovskite junctions with polaronic charge carriers. In particular, we studied manganite–titanate p–n heterojunctions made of n-doped SrTi1− y Nb y O3, y = 0.002 and p-doped Pr1− x Ca x MnO3, x = 0.34 having a strongly correlated electron system. The diffusion length of the polaron carriers was analyzed by electron beam-induced current (EBIC) in a thin cross plane lamella of the junction. In the J–V characteristics, the polaronic nature of the charge carriers is exhibited mainly by the temperature dependence of the microscopic parameters, such as the hopping mobility of the series resistance and a colossal electro-resistance (CER) effect in the parallel resistance. We conclude that a modification of the Shockley equation incorporating voltage-dependent microscopic polaron parameters is required. Specifically, the voltage dependence of the reverse saturation current density is analyzed and interpreted as a voltage-dependent electron–polaron hole–polaron pair generation and separation at the interface.
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43

LEWIS, R. A., X. L. WANG, S. X. DOU, N. BISKUP i J. S. BROOKS. "FERROMAGNETIC RESONANCES IN POLYCRYSTALLINE La0.8Li0.2MnO3". International Journal of Modern Physics B 16, nr 20n22 (30.08.2002): 3351–54. http://dx.doi.org/10.1142/s0217979202014395.

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We report on magnetic resonances observed in the doped lanthanum manganite La0.8Li0.2MnO3 (LLMO) below the Curie temperature Tc ~ 235 K. Fields up to 30 T were employed. The data are compared with that from the archetypal colossal magnetoresistance perovskite La0 7Ca0 3MnO3 (LCMO) taken under similar conditions. In contrast to LCMO, LLMO exhibits two resonances, one above and one below the LCMO resonant field. These are attributed to a ferromagnetic interaction and a canted ferromagnetic interaction.
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44

Srivastava, Archana, i N. K. Gaur. "Thermal Expansion and Specific Heat of Solid Oxide Fuel Cell Material Bi1-xSrxMnO3 in Orthorhombic Perovskite Phase". Key Engineering Materials 547 (kwiecień 2013): 91–94. http://dx.doi.org/10.4028/www.scientific.net/kem.547.91.

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With the objective of exploring the unknown thermodynamic phase diagram of Bi1-xSrxMnO3 family, we present here an investigation of the temperature-dependent (10K < T < 900K) thermodynamic behavior of Bi1-xSrxMnO3 (x=0.25, 0.30, 0.50). We report here probably for the first time the thermal expansion and specific heat along with other thermal properties of strontium doped perovskite manganite BiMnO3. The specific heat values revealed by using RIM are in closer agreement with the available experimental data for some concentrations (x) of Bi1-xSrxMnO3. In addition, the results on the cohesive energy (f) in orthorhombic perovskite phase, molecular force constant (¦), Reststrahlen frequency (no) and Gruneisen parameter (g) are also presented.
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45

Zhang, Yingtang. "Magnetic relaxation behavior in Tb-doped perovskite manganite". Journal of Magnetism and Magnetic Materials 323, nr 1 (styczeń 2011): 1–3. http://dx.doi.org/10.1016/j.jmmm.2010.08.045.

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46

Vargas, Reinaldo Azevedo, Rubens Chiba, Marco Andreoli i Emília Satoshi Miyamaru Seo. "Strontium Dopant Concentrations Influence on Nd1-xSrxMnO3±δ Structural and Electrical Conductivity". Materials Science Forum 660-661 (październik 2010): 636–40. http://dx.doi.org/10.4028/www.scientific.net/msf.660-661.636.

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Many different types of ceramic materials are currently being studied as possible cathodes in Solid Oxide Fuel Cells (SOFC), in an attempt to reduce operating temperatures. Strontium-doped neodymium manganite (Nd1-xSrxMnO3±δ) was used as an intermediate temperature solid oxide fuel cell cathode. X-ray diffraction and electrical conductivity of the Nd1-xSrxMnO3±δ system with a perovskite structure were studied in function of x equal to 0.10, 0.30 and 0.50. An orthorhombic pseudo-perovskite structure was assigned to all powder compositions prepared by standard ceramic technique. Electrical conductivity was described by the small polaron hopping conductivity model, as well as, increases due to regular increments of Sr content for all compositions. Electrical conductivity was measured at 25.2, 26.4 and 37.1Scm-1 for x = 0.10, 0.30 and 0.50, respectively at 800°C.
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47

Tokuda, Makoto, Khandaker Jahirul Isram, Yudai Ogata, Yoji Mine, Tadao Nishiyama, Shinya Hayami, Akira Yoshiasa i Tsutomu Mashimo. "Strong-Gravity Experiments on Perovskite-Type Oxides". Advances in Science and Technology 88 (październik 2014): 70–73. http://dx.doi.org/10.4028/www.scientific.net/ast.88.70.

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Strong gravitational field causes the displacement or/and sedimentation of atoms in solids, by which we can changes the crystalline state or/and composition in multicomponent condensed matter. Perovskite-type doped manganite, La1-xSrxMnO3(LSMO) has unique magnetoresistance effect which is called “colossal magnetoresistance (CMR)”. In this study, the strong gravity experiment (0.40x106G, 400°C, 20h) was performed on the LSMO oriented crystal to examine the change in composition or structure. The LSMO crystal whose growing crystal direction is normal to (214) plane was prepared by the floating zone method. The EPMA and XRD results of the gravity sample revealed that the La compositions decrease in the crystal grain, while the structure did not change much. The SQUID analysis showed that the magnetic property of the gravity sample had changed.
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48

Mostafa, A. G., E. K. Abdel-Khalek, W. M. Daoush i S. F. Moustfa. "Study of some co-precipitated manganite perovskite samples-doped iron". Journal of Magnetism and Magnetic Materials 320, nr 24 (grudzień 2008): 3356–60. http://dx.doi.org/10.1016/j.jmmm.2008.07.025.

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49

Biswas, Subhayan, Sandip Chatterjee, P. Chatterjee, A. K. Nigam i S. K. De. "Chemical disorder effects in transport and magnetic properties of perovskite manganite". Journal of Materials Research 20, nr 4 (1.04.2005): 813–17. http://dx.doi.org/10.1557/jmr.2005.0114.

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The dependence of the novel properties observed in colossal magnetoresistance (CMR) materials, other than average ionic radii 〈rA〉 and Mn valence ratio (Mn3+/Mn4+), was investigated through examination of the transport and magnetic properties of Pr0.65(Ca0.7Sr0.3)0.35MnO3, La0.123Pr0.527(Ca0.8Sr0.2)0.35MnO3, and Pr0.65(Ca0.866Ba0.134)0.35MnO3. The average ionic radii 〈rA〉 and valence ratio of all three samples have been kept equal. The results of this investigation indicate a more intense role of the nature of individual A-site cation and the lattice mismatch. A remarkably large magnetoresistance of the order of 108 at moderate magnetic field has been observed for Ba-doped sample.
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50

Mohd Hanif, Siti Hashimah, Walter Charles Primus, Abdul H. Shaari i Hassan Jumiah. "Fabrication and Electrical Properties of Strontium Doped Lanthanum Manganite Titanite Oxide". Advanced Materials Research 1107 (czerwiec 2015): 278–82. http://dx.doi.org/10.4028/www.scientific.net/amr.1107.278.

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Composition of La0.7Sr0.3Mn0.4Ti0.6O3has been prepared using solid state reaction method where its crystal structure and electrical properties has been analyzed using X-ray Diffractometer (XRD) and Low frequency LCR meter, respectively. The result, shows that the sample has cubic perovskite structure with the existence of impurities phase. In electrical measurement, the frequency dependence of complex capacitance plot shows the sample have strong dispersion at lower frequency and the impedance plane plot shows a semicircle due to the grain effect. The sample electrical properties are also represented in equivalent electrical circuit which consists of a quasi d.c and in parallel with conductance.
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