Improving the crystallinity and magnetocaloric effect of the perovskite La0.65Sr0.35MnO3 using microwave irradiation

Katherine McBride, Suzanne Bennington-Gray, James Cook, Lorenzo Stella, Solveig Felton, Danai Poulidi

Research output: Contribution to journalArticle

4 Citations (Scopus)
168 Downloads (Pure)

Abstract

The use of microwave (MW) irradiation to assist the modified peroxide sol-gel synthesis of La1-xSrxMnO3 was shown to 1)improve crystallinity and 2)enhance the magnetic susceptibility and magnetocaloric effect (MCE) of samples compared to those synthesised using the conventional method. The improvement in crystallinity of samples synthesised using MW irradiation was evident in the structural characterisation conducted using SEM and XRD. Magnetic heating experiments on La1-xSrxMnO3 (x = 0.25, 0.35 and 0.4) showed that for the MW-assisted method, the most suitable material for magnetic fluid hyperthermia applications was La0.65Sr0.35MnO3. MW settings (time and power) were investigated in an attempt to further optimise the MCE. Increasing MW time settings used (10 min, 30 min and 2 hours) led to increased saturation temperatures (45.9 °C, 57.0 °C and 58.3 °C respectively), with a linear relationship between the MW power settings used and the MCE also observed during magnetic heating experiments. Specific absorption rates as high as 175 Wg-1Mn were achieved compared to the conventional maximum of 56 Wg-1Mn in previous work. The enhancement of MCE was ascribed to a greater core ferromagnetic contribution as a result of the improvement in the degree of crystallinity and magnetic susceptibility of the samples synthesised with MW-irradiation .
Original languageEnglish
Pages (from-to)3776-3791
JournalCrystEngComm
Volume19
Early online date01 Jun 2017
DOIs
Publication statusPublished - Jun 2017

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Magnetocaloric effects
Microwave irradiation
Perovskite
crystallinity
Microwaves
microwaves
irradiation
Magnetic susceptibility
Heating
Magnetic fluids
magnetic permeability
Peroxides
Sol-gels
Experiments
heating
hyperthermia
peroxides
Scanning electron microscopy
perovskite
gels

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title = "Improving the crystallinity and magnetocaloric effect of the perovskite La0.65Sr0.35MnO3 using microwave irradiation",
abstract = "The use of microwave (MW) irradiation to assist the modified peroxide sol-gel synthesis of La1-xSrxMnO3 was shown to 1)improve crystallinity and 2)enhance the magnetic susceptibility and magnetocaloric effect (MCE) of samples compared to those synthesised using the conventional method. The improvement in crystallinity of samples synthesised using MW irradiation was evident in the structural characterisation conducted using SEM and XRD. Magnetic heating experiments on La1-xSrxMnO3 (x = 0.25, 0.35 and 0.4) showed that for the MW-assisted method, the most suitable material for magnetic fluid hyperthermia applications was La0.65Sr0.35MnO3. MW settings (time and power) were investigated in an attempt to further optimise the MCE. Increasing MW time settings used (10 min, 30 min and 2 hours) led to increased saturation temperatures (45.9 °C, 57.0 °C and 58.3 °C respectively), with a linear relationship between the MW power settings used and the MCE also observed during magnetic heating experiments. Specific absorption rates as high as 175 Wg-1Mn were achieved compared to the conventional maximum of 56 Wg-1Mn in previous work. The enhancement of MCE was ascribed to a greater core ferromagnetic contribution as a result of the improvement in the degree of crystallinity and magnetic susceptibility of the samples synthesised with MW-irradiation .",
author = "Katherine McBride and Suzanne Bennington-Gray and James Cook and Lorenzo Stella and Solveig Felton and Danai Poulidi",
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Improving the crystallinity and magnetocaloric effect of the perovskite La0.65Sr0.35MnO3 using microwave irradiation. / McBride, Katherine; Bennington-Gray, Suzanne; Cook, James; Stella, Lorenzo; Felton, Solveig; Poulidi, Danai.

In: CrystEngComm, Vol. 19, 06.2017, p. 3776-3791.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Improving the crystallinity and magnetocaloric effect of the perovskite La0.65Sr0.35MnO3 using microwave irradiation

AU - McBride, Katherine

AU - Bennington-Gray, Suzanne

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AU - Stella, Lorenzo

AU - Felton, Solveig

AU - Poulidi, Danai

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N2 - The use of microwave (MW) irradiation to assist the modified peroxide sol-gel synthesis of La1-xSrxMnO3 was shown to 1)improve crystallinity and 2)enhance the magnetic susceptibility and magnetocaloric effect (MCE) of samples compared to those synthesised using the conventional method. The improvement in crystallinity of samples synthesised using MW irradiation was evident in the structural characterisation conducted using SEM and XRD. Magnetic heating experiments on La1-xSrxMnO3 (x = 0.25, 0.35 and 0.4) showed that for the MW-assisted method, the most suitable material for magnetic fluid hyperthermia applications was La0.65Sr0.35MnO3. MW settings (time and power) were investigated in an attempt to further optimise the MCE. Increasing MW time settings used (10 min, 30 min and 2 hours) led to increased saturation temperatures (45.9 °C, 57.0 °C and 58.3 °C respectively), with a linear relationship between the MW power settings used and the MCE also observed during magnetic heating experiments. Specific absorption rates as high as 175 Wg-1Mn were achieved compared to the conventional maximum of 56 Wg-1Mn in previous work. The enhancement of MCE was ascribed to a greater core ferromagnetic contribution as a result of the improvement in the degree of crystallinity and magnetic susceptibility of the samples synthesised with MW-irradiation .

AB - The use of microwave (MW) irradiation to assist the modified peroxide sol-gel synthesis of La1-xSrxMnO3 was shown to 1)improve crystallinity and 2)enhance the magnetic susceptibility and magnetocaloric effect (MCE) of samples compared to those synthesised using the conventional method. The improvement in crystallinity of samples synthesised using MW irradiation was evident in the structural characterisation conducted using SEM and XRD. Magnetic heating experiments on La1-xSrxMnO3 (x = 0.25, 0.35 and 0.4) showed that for the MW-assisted method, the most suitable material for magnetic fluid hyperthermia applications was La0.65Sr0.35MnO3. MW settings (time and power) were investigated in an attempt to further optimise the MCE. Increasing MW time settings used (10 min, 30 min and 2 hours) led to increased saturation temperatures (45.9 °C, 57.0 °C and 58.3 °C respectively), with a linear relationship between the MW power settings used and the MCE also observed during magnetic heating experiments. Specific absorption rates as high as 175 Wg-1Mn were achieved compared to the conventional maximum of 56 Wg-1Mn in previous work. The enhancement of MCE was ascribed to a greater core ferromagnetic contribution as a result of the improvement in the degree of crystallinity and magnetic susceptibility of the samples synthesised with MW-irradiation .

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