Electrical conduction in La0.85Sr0.15MnO3:Ag  (0 ≤ x ≤ 0.5) ceramics with large room-temperature TCR

Liu, Yang; Sun, Tao; Dong, Gang; Zhang, Shuai; Liu, Xiang

doi:10.1016/j.ceramint.2019.08.113

Cited by 13 publications

(2 citation statements)

References 37 publications

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“…The low-field magnetoresistance (LFMR) of polycrystalline manganite is an important topic of increasing research interest. It is proposed that LFMR is due to spin-polarized tunnelling through energy barriers at grain boundaries between grains with different spin orientation [13], [14]. The magnetization alignment process of each grain can occur at fields as low as the coercivity, which explains the sharp decrease in resistivity at low fields.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La0.7Sr0.2Ca0.1MnO3:TiO2 Composite

Zulkarnain

Kurniawan

Imaduddin³

et al. 2023

SSP

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Electrical transport in materials have been studied extensively due to its great potential in spintronic technology. The introduction of the secondary phase into the manganite matrix can modify the electrical properties, subsequently improving the low-field magnetic resistance (LFMR). In this work, we study the change in electrical properties at different temperatures of polycrystalline (1-x)La0.7Sr0.2Ca0.1MnO3/xTiO2 (LT) composites where x = 0, 0.05 and 0.1. Polycrystalline La0.7Sr0.2Ca0.1MnO3 (LSCMO) was synthesized by sol-gel method, calcined at 700 °C, and pre-sintered at 800 °C for 6 h before adding TiO2. TiO2 as filler was mixed with LSCMO by wet mixing and stirring for about 30 min until a homogeneous compound was formed. Composite LT was then inserted to oven up to 100 °C for 2h to remove the moisture, compacted at 10 MPa, and sintered at 1200°C for 12 h. All samples in the LSCMO phase have a rhombohedral crystal structure with space group R3c. The crystal structure parameters were studied using Rietveld refinement through GSAS II software. The sample was characterized by SEM to represent the morphology of the sample. As the TiO2 content increased, the magnetization decreased, as observed by VSM analysis at room temperature. The electrical transport properties of pure LSCMO and LT were characterized by cryogenic from 195K to 260 K. The resistivity of LT10 is too high compared to that of LT5 and as the temperature increases, the resistivity in this range will decrease. For 200 K, the resistivity of LSCMO, LT5 and LT10 are 3.09 x 10-2 ohm.cm, 4.40 x 103 ohm.cm and 4.77 x 104 ohm.cm respectively.

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Section: Introductionmentioning

confidence: 99%

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La0.7Sr0.2Ca0.1MnO3:TiO2 Composite

Zulkarnain

Kurniawan

Imaduddin³

et al. 2023

SSP

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“…Наноразмерные сложные оксиды на основе манганита лантана и других РЗЭ со структурой типа перовскита 3 y ABO  (в том числе, допированные в подрешетках А и В) обладают свойствами, определяющими их использование. К таковым относятся каталитические [1][2][3] (катализаторы для защиты окружающей среды и реализации технологических процессов, компоненты твердооксидных топливных элементов); электромагнитные характеристики [4][5][6][7][8]: наличие эффекта колоссального магнитосопротивления, магнитокалорических свойств [5,6,8] (применение в т.ч. в биомедицине), магнитооптические характеристики [7] и пр.…”

Section: Introductionunclassified

Lanthanum Manganite Nanopowders Synthesis via Combustion Reactions Under the Influence of Electromagnetic Field

Остроушко¹,

Жуланова²,

Кудюков³

et al. 2022

Physical and Chemical Aspects of the Study of Clusters, Nanostructures and Nanomaterials

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Методом горения нитрат-органических прекурсоров разного состава были синтезированы образцы манганита лантана, допированного стронцием. Процесс горения реализовали в условиях воздействия внешнего переменного электромагнитного поля и в его отсутствие. Обнаружено, что в ходе горения прекурсоров происходит термохимическое генерирование зарядов, зафиксированное как разность потенциалов прекурсор-земля. Показано, что состав исходного прекурсора (органический компонент и его количество), а так же присутствие внешнего переменного электромагнитного поля оказывают влияние на величину возникающей разности потенциалов, варьировавшейся от -7 до 125 B. Наличие внешнего поля приводило к сдвигу возникающей разности потенциалов в сторону положительных значений. Показана взаимосвязь между изученными электромагнитными свойствами (намагниченность насыщения, коэрцитивная сила, температура Кюри) полученных образцов и разностью потенциала прекурсор - земля, возникающей в ходе синтеза. Значения температуры Кюри варьировались в области 38-79°C для образцов, полученных под влиянием переменного электро-магнитного поля, и 49-104°C - в его отсутствие. Lanthanum manganite doped with strontium samples were synthesized by the combustion method of nitrate-organic precursors of different composition. The combustion process was realized under the influence of an external alternating electromagnetic field and in its absence. It was found that thermochemical generation of charges occurs during precursor’s combustion, recorded as a potential difference of precursor-earth. It is shown that the composition of the initial precursor (organic component and its quantity), as well as the presence of an external alternating electromagnetic field, affect the magnitude of the potential difference that occurs, varying from -7 to 125 V. The relationship between the studied electromagnetic properties (saturation magnetization, coercive force, Curie temperature) of the obtained samples and the precursor-earth potential difference arising during synthesis is shown. The Curie temperature values varied in the range of 38-79°C for samples obtained under the influence of an alternating electro-magnetic field, and 49-104°C in its absence.

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Enhancement of magnetoresistance and near room-temperature temperature coefficient of resistivity in polycrystalline La0.7Ca0.24Na0.06MnO3 by silver doping

Yang

et al. 2021

J Sol-Gel Sci Technol

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Electrical conduction in La0.85Sr0.15MnO3:Ag (0 ≤ x ≤ 0.5) ceramics with large room-temperature TCR

Cited by 13 publications

References 37 publications

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>MnO<sub>3</sub>:TiO<sub>2</sub> Composite

Microstructure, Magnetic and Electrical Transport Properties of Sol-Gel Synthesized La<sub>0.7</sub>Sr<sub>0.2</sub>Ca<sub>0.1</sub>MnO<sub>3</sub>:TiO<sub>2</sub> Composite

Lanthanum Manganite Nanopowders Synthesis via Combustion Reactions Under the Influence of Electromagnetic Field

Enhancement of magnetoresistance and near room-temperature temperature coefficient of resistivity in polycrystalline La0.7Ca0.24Na0.06MnO3 by silver doping

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