Preparation and characterization of La0.7AE0.3MnO3 (AE=Ca, Sr, Ba): Perovskite structured manganites

Im, Hung Su; Chon, Gom-Bai; Lee, Sang M.; Koo, Bon Heun; Lee, C.G.; Jung, Myung Hun

doi:10.1016/j.jmmm.2006.12.002

Cited by 50 publications

(19 citation statements)

References 7 publications

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“…This variation is also obtained in different preparation method with similar divalent substitution in previous reports [9,10] . Magnetic properties (Fig.…”

Section: +supporting

confidence: 82%

“…3) investigation via VSM measurement shown that LBMO and LSMO systems show a transition from ferromagnetic to paramagnetic (Curie temperature, T C ) at 343.0 and 363.5 K, respectively. This result is slightly higher than the reported value [9] . From previous study, T c for LCMO is 240 K, which is lower than the measurement range (300 K) [10] .…”

Section: +contrasting

confidence: 74%

“…Recently, the effect of grain boundaries in the polycrystalline manganites has been studied intensively, where the grain's shape or microstructure will be changed with different preparation process [6,7] or dopant [7][8][9] . It is found that substitution of divalent atoms with variance atomic radius and preparation process will influence the magnetic properties and electrical properties of the system [6,7] .…”

Section: Introductionmentioning

confidence: 99%

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Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

Lim¹,

Ng²,

Halim³

et al. 2009

American J. of Applied Sciences

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Problem statement: Microstructure of the grain will influence the properties of a polycrystalline manganites when different dopant is introduced. In this work, an effort had been made to investigate the influence of Ca, Ba and Sr substitution in La site. Approach: Polycrystalline manganites compound of La 0.67 A 0.33 MnO 3 where A = Ba, Sr and Ca had been prepared via conventional solid-state reaction method. The structure, microstructure, magnetic and electrical properties had been investigated using XRD, SEM, VSM and four-point probe techniques. Results: XRD spectrums showed that LBMO and LCMO were in single-phase orthorhombic structure whereas LSMO was rhombohedral structure. Scanning electron micrographs showed that LSMO had smaller average grain size as compared to LBMO. However, for LCMO, there was no clear grain boundary that can be observed and all the grains were well connected. The difference in the microstructure image might be due to the variance A-site cation that differs in grain growth. The Curie temperature, T c of LBMO and LSMO was 343.0 and 363.5 K, respectively. But the T c for LCMO was lower then 300 K. The T p for LCMO was 215 K while it was near or above 300K for LBMO and LSMO. All samples showed extrinsic Magnetoresistance (MR) effect. Higher MR was observed well below T c or T p where MR value increased monotonically with the decrease of temperature. This was associated with the different grain and grain boundary formation when different cation was substituted. LCMO displayed the highest low-field MR value (-15.82% at 0.2 T, 90 K) and high-field MR (-25.60% at 1 T, 300 K). Conclusion: Hence, electrical and magnetic transition temperature (T p and T c ) were affected by the average A-site cation radius.

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“…This variation is also obtained in different preparation method with similar divalent substitution in previous reports [9,10] . Magnetic properties (Fig.…”

Section: +supporting

confidence: 82%

Section: +contrasting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

Lim¹,

Ng²,

Halim³

et al. 2009

American J. of Applied Sciences

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show abstract

“…The SEM shows that the microstructure is dense globally but a few scattered micropores are observed, which indicates that there is some porosity in the sample. The micropores mainly result from the poor sintering property of LBMO [20]. Research on porous PZT ceramics indicates that the porosity may decrease the piezoelectric coefficient (d 33 ), dielectric constant (ε r ) and remnant polarization (P r ) of the sample, while it may increase the dielectric loss [24][25][26].…”

Section: Methodsmentioning

confidence: 99%

“…The theoretical saturation polarization (P s ) is 20.35 mC/cm 2 , and the piezoelectric constant d 33 is 460 pC/N. La 0.7 Ba 0.3 MnO 3 (LBMO), as mentioned above, is a ferromagnetic material; the saturation magnetization (Ms) is $ 80 emu/g (T¼ 5 K), and the curie temperature (Tc) is $ 290 K [19,20]. Moreover, LBMO has an outstanding magnetostriction property at room temperature, achieving 254 Â 10 À 6 in a magnetic field of 8.2 kOe [21].…”

Section: Introductionmentioning

confidence: 99%

Magneto-electric coupling study in multiferroic La0.7Ba0.3MnO3–BaTiO3 composite ceramic at room temperature

Zhou

et al. 2015

Ceramics International

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Improved electrical properties of La2/3Ba1/3MnO3:Ag0.04 thin films by thermal annealing

et al. 2014

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Preparation and characterization of La0.7AE0.3MnO3 (AE=Ca, Sr, Ba): Perovskite structured manganites

Cited by 50 publications

References 7 publications

Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

Effect of Divalent Ions (A = Ca, Ba and Sr) Substitution in La-A-Mn-O Manganite on Structural, Magnetic and Electrical Transport Properties

Magneto-electric coupling study in multiferroic La0.7Ba0.3MnO3–BaTiO3 composite ceramic at room temperature

Improved electrical properties of La2/3Ba1/3MnO3:Ag0.04 thin films by thermal annealing

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