Study of the bipyramidal site in magnetoplumbite-like compounds, SrM12O19 (M = Al, Fe, Ga)

Kimura, Kosei; Ohgaki, Masataka; Tanaka, Katsufumi; Morikawa, Hideki; Μarumo, F.

doi:10.1016/0022-4596(90)90081-8

Cited by 108 publications

(89 citation statements)

References 14 publications

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“…The structure refinements of CaAl O (34,35), SrAl O (31), and LaMgAl O (6, 9) indicate that the Al(2) cations are positioned at ideal 2b mirror plane sites, whereas those of LaNiAl O (36) and LaFeAl O (37) reveal that they are displaced from the mirror plane, being positioned in the 4e tetrahedral sites. These two types of configurations of the Al(2) cations were referred to as ''central atom model'' and ''split atom model,'' respectively, by Kimura et al (38). They suggested that the potential around the Al(2) site has double minima in all the magnetoplumbite-type crystals at lower temperatures, and, therefore, there are two plausible states for the Al(2) cations at room temperature, i.e., the static disorder and dynamic disorder states; they also proposed that the split atom model is plausible in SrAl O and SrGa O .…”

Section: The Effect Of Mg Distribution On the Positions Of The Al Ionmentioning

confidence: 99%

Defect Energetics and Nonstoichiometry in Lanthanum Magnesium Hexaaluminate

Park

Cormack

1997

Journal of Solid State Chemistry

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Section: The Effect Of Mg Distribution On the Positions Of The Al Ionmentioning

confidence: 99%

Defect Energetics and Nonstoichiometry in Lanthanum Magnesium Hexaaluminate

Park

Cormack

1997

Journal of Solid State Chemistry

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“…The Fe +++ ions are located in the interstices of these ten layers. Three parallel (12k, 2a, and 2b) and two antiparallel (4f 1 and 4f 2 ) spins of Fe +++ ions are coupled by superexchange interactions through the O 2− ions [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on Properties of Sr0.7Nd0.3Co0.3Fe11.7O19

Kumar

Kaur

Godara

et al. 2015

J Supercond Nov Magn

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In this work, strontium hexaferrite powder with composition Sr 0.7 Nd 0.3 Co 0.3 Fe 11.7 O 19 (SrNdC) was synthesized via a sol-gel method and sintered at 500, 700, 900, and 1100 • C. The properties like phase analysis, crystallite size, surface area, lattice constant, and strain were evaluated using X-ray diffraction (XRD). The presence of two prominent peaks at 432 and 586 cm −1 in Fourier transform infrared (FT-IR) spectra indicates the formation of hexaferrite. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show the cluster formation and hexagonal structure of synthesized hexaferrite. Thermogravimetric analysis (TGA) reveals the variation of mass of precursor with temperature and temperature of formation of SrNdC. M-H curves obtained from a vibrating sample magnetometer (VSM) show that the magnetic properties like coercivity, saturation, and retentivity are significantly affected by sintering temperature.

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“…The phase relationships in the system SrO}Ga O have been investigated several times since the "rst study of Glasser and Dent Glasser (1 (9,10). As a part of an ongoing study of high-pressure calcium and strontium gallates, we have synthesized a new polymorph of SrGa O (named -SrGa O ) that is closely related in terms of its unit cell parameters to the -form.…”

Section: Introductionmentioning

confidence: 99%