Synthesis and Structure of (Ca,Sr)-Substituted Lanthanum Manganite

Slobodin, B. V.; Vladimirova, E. V.; Petukhov, S. L.; Сурат, Л. Л.; Леонидов, И. А.

doi:10.1007/s10789-005-0228-4

Cited by 6 publications

(7 citation statements)

References 37 publications

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“…Data in each section are ordered by date of publication. The references a are identified below. a [R1] Zeng et al (1999); [R5] Fawcett et al (1998); [R6] Lichtenthaler (2005); [R14] Poeppelmeier et al (1982); [R17] Taguchi (1996); [R18] Taguchi et al (1998); [R19] Blasco et al (2000); [R20] Chmaissem et al (2001); [R21] Machida et al (2001); [R22] Melo Jorge et al (2001); [R23] Moritomo et al (2001); [R25] Rørmark et al (2002); [R28] Gil de Muro et al (2005); [R29] Melo Jorge et al (2005); [R30] Slobodin et al (2005); [R32] Ang et al (2006); [R33] Akhtar et al (2006); [R34] Božin et al (2008); [R35] Kar et al (2006); [R36] Zhou and Kennedy (2006); [R38] Søndenå et al (2007); [R39] Moritomo (2008); [R40] Isasi et al (2009). b Notations: LXRD—laboratory X-ray diffraction.…”

Section: Discussion: Lattice Parameters and The Magnitude Of Orthmentioning

confidence: 99%

“…For higher temperatures, highersymmetry unit cells have been reported ͑Taguchi et al, 1989a͒. Details of the CaMnO 3 structure have been determined in various laboratories using X-ray and neutron diffraction for, almost exclusively, polycrystalline samples ͑MacChesney et al., 1967;Poeppelmeier et al, 1982;Taguchi et al, 1989a;Taguchi, 1996;Taguchi et al, 1998;Fawcett et al, 1998;Zeng et al, 1999;Blasco et al, 2000;Chmaissem et al, 2001;Machida et al, 2001;Melo Jorge et al, 2001;Moritomo et al, 2001;Wiebe et al, 2001;Rørmark et al, 2002;Töpfer et al, 2004;Bakken et al, 2005;Gil de Muro et al, 2005;Lichtenthaler, 2005;Melo Jorge et al, 2005;Slobodin et al, 2005;Taguchi et al, 2005;Akhtar et al, 2006;Ang et al, 2006;Kar et al, 2006;Zhou and Kennedy, 2006;Nakade et al, 2007;Søndenå et al, 2007;Božin et al, 2008;Moritomo, 2008;Isasi et al, 2009͒. Of particular importance is the result obtained through a joint refinement of X-ray and neutron diffraction data by Blasco et al ͑2000͒. Structural distortions in the CaMnO 3 structure have also been studied by Raman spectroscopy ͑Abrashev et al, 2002͒.…”

Section: Introductionmentioning

confidence: 99%

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Lattice parameters and orthorhombic distortion of CaMnO₃

et al. 2010

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CaMnO 3 is a parent compound for numerous multicomponent manganese perovskite oxides. Its crystallographic data are of primary importance in the science and technology of functional CaMnO 3 -based materials. In the present study, data were collected for a CaMnO 3 sample at 302 K. The crystal structure refinement yields accurate absolute values of lattice parameters, a = 5.281 59͑4͒ Å, b = 7.457 30͑4͒ Å, and c = 5.267 48͑4͒ Å, leading to orthorhombic distortion of ͑c / a , ͱ 2c / b͒ = ͑0.997 33, 0.998 95͒. The orthorhombic distortion of the CaMnO 3 structure is discussed on the basis of comparison of our unit-cell size with data already published. At a graphical representation of the distortion, it is observed that there is a considerable scatter of the distortion values among the literature data but, interestingly, a considerable fraction of experimental results ͑including the present one͒ for stoichiometric samples are grouped around the distortion ͑c / a , ͱ 2c / b͒ = ͑0.9973, 0.9990͒, which lies close to a maximum in the extent of orthorhombicity. The influence of off-stoichiometry on the orthorhombic distortion is discussed on the basis of available experimental data. Simulations, employing a mean-field approach for low temperatures, predict an increase in cell volume and structural distortions with the concentration of oxygen vacancies when the additional electrons are localized on the manganese. A simple model of delocalization produced the opposite effect, which is expected to combine with lattice vibrations to recover the cubic phase at high temperatures.

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Section: Discussion: Lattice Parameters and The Magnitude Of Orthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Lattice parameters and orthorhombic distortion of CaMnO₃

et al. 2010

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“…3 It crystallizes in the tetragonal space group I4 ˉ2d (Z = 6). Isostructural compounds are Fe 5.33 Ge 2.67 O 12 , 11 Mg 3 (AsO 4 ) 2 , 12 Co 3 (AsO 4 ) 2 , 13,14 ∼LiMg 4 (VO 4 ) 3 , [15][16][17] 19 NaMg 4 (VO 4 ) 3 20 and NaMn 4 (VO 4 ) 3 (first reported by Yahia et al 21 and not by Clemens et al 22 ). 16 / 18 of the Mn 2+ cations are found in octahedral coordination on two different crystallographic sites (8c and 8d).…”

Section: Introductionmentioning

confidence: 93%

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

et al. 2013

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The high temperature phase of manganese vanadate h.t.-Mn3(VO4)2 and the solid solution with NaMn4(VO4)3 (Na(x)Mn(4.5-x/2)(VO4)3) were shown to order ferrimagnetically below 55 K for x < 1, whereas NaMn4(VO4)3 is an antiferromagnet. The materials show very soft magnetic properties with low coercitive fields required for demagnetisation (Hc < 0.001 T). The magnetic structure of h.t.-Mn3(VO4)2 was determined by Rietveld analysis of low temperature powder neutron diffraction data, and shows antiferromagnetic alignment of the magnetic moments of the Mn(2+) ions on the 8c and 8d sites. The ferrimagnetic moments were shown to result from the magnetic moments of the Mn(2+) cations located on the 4b site in unusual dodecahedral coordination (Hoard dodecahedron). This coordination can be understood as two penetrating oxygen coordination tetrahedra, one showing shorter and one showing longer Mn-O distances. The magnetic moments of the Mn(2+) ions on the 4b site are aligned parallel to the ones on 8d and antiparallel to the ones on 8c, being in good agreement with the GKA rules. The local exchange interactions between the Mn(2+) ions on the 4b to those on the 8c/8d sites are likely to be similar in strength and competitive and therefore probably contribute to the soft magnetic properties.

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“…The Rietveld analyses for the materials in Mn 4+ content and also the substitution of La 3+ for a larger sized cation on the A-site for doped lanthanum manganates. 22 From the quantification of crystalline phases using…”

Section: Characterizationmentioning

confidence: 99%

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

McBride

Partridge

Bennington-Gray

et al. 2017

Materials Research Bulletin

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Highlights• La1-xCaxMnO3 and La1-xBaxMnO3 synthesised using the modified peroxide sol-gel synthesis.• Enhanced magnetic heating for manganates doped with A-site cations larger than La 3+ .• Reduced magnetic heating observed for manganates doped with A-site cations smaller than La 3+ . 1 AbstractThe effect of the A-site dopant ionic radii on the observed magnetocaloric effect (MCE) exhibited by three different families of manganese-based perovskites was investigated using both induction heating and SQUID magnetometry measurements. The doped perovskites La1-xSrxMnO3 (LSMO), La1-xCaxMnO3 (LCMO), and La1-xBaxMnO3 (LBMO) (x = 0.25, 0.35, 0.4) were prepared using a modified peroxide sol-gel synthesis. This method has not been previously used for the synthesis of LCMO or LBMO. Structural characterisation of the agglomerates of magnetic nanoparticles (MNP) for each material was carried out using SEM, XRD and IR spectroscopy. Magnetic heating was observed for materials with larger A-site dopant radii relative to La 3+ ; LSMO40 and LBMO40, with average SARs obtained of 51.5 Wg -1 Mn and 33.8Wg -1 Mn respectively. However, reduced magnetic heating effects were observed for smaller A-site dopant radii relative to La 3+ (LCMO). In fact, the calculated Specific Absorption Rate for LCMO40 of 14.72 Wg -1 Mn is half that of the blank.

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Synthesis and Structure of (Ca,Sr)-Substituted Lanthanum Manganite

Cited by 6 publications

References 37 publications

Lattice parameters and orthorhombic distortion of CaMnO₃

Lattice parameters and orthorhombic distortion of CaMnO₃

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

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Synthesis and Structure of (Ca,Sr)-Substituted Lanthanum Manganite

Cited by 6 publications

References 37 publications

Lattice parameters and orthorhombic distortion of CaMnO3

Lattice parameters and orthorhombic distortion of CaMnO3

On the soft magnetic properties of the compounds of the series NaxMn4.5−x/2(VO4)3 and the magnetic structure of h.t.-Mn3(VO4)2 (x = 1)

Synthesis, characterisation and study of magnetocaloric effects (enhanced and reduced) in manganate perovskites

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Lattice parameters and orthorhombic distortion of CaMnO₃

Lattice parameters and orthorhombic distortion of CaMnO₃