Magnetic ordering and spin structure in Ca-bearing clinopyroxenes CaM2+(Si, Ge)2O6, M=Fe, Ni, Co, Mn

Redhammer, Günther J.; Roth, Georg; Treutmann, W.; Paulus, Werner; André, G.; Pietzonka, Clemens; Amthauer, Georg

doi:10.1016/j.jssc.2008.08.014

Cited by 37 publications

(24 citation statements)

References 33 publications

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“…16 20 is close to the high-spin (HS) configuration of the Fe 2+ (d 6 ) ions with spin S = 2 and electronic configuration t 4 2g e 2 g . The effective moment μ eff = 5.23 μ B obtained in the same paper from the suscepti-bility measurement is somewhat larger, than μ theor eff = 4.9 μ B corresponding to S = 2 and neglecting orbital contribution.…”

Section: Introductionmentioning

confidence: 67%

Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
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The spin-state transitions in Fe-based clinopyroxenes are predicted and investigated with the use of the band structure calculations within GGA + U approach. The transitions were found to be of first order with critical pressures P c ∼ 40 GPa for CaFeSi 2 O 6 and P c ∼ 60 GPa for NaFeSi 2 O 6 . The spin-state transitions are accompanied by 4% change in the lattice volume for both compounds. The present study will motivate further experimental and theoretical investigations of the spin-state transitions in pyroxenes.

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Section: Introductionmentioning

confidence: 67%

Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
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“…The tetrahedral chain is linked to the octahedral one via common O 2 oxygen atoms. Any change in the size of the octahedra, in order to incorporate the cation with different ionic radius, causes different kinking of the tetrahedral chain . As shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

Raman spectroscopy of CaM²⁺Ge₂O₆(M²⁺ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes

Lambruschi

Aliatis

Mantovani

et al. 2015

J. Raman Spectrosc.

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The Raman spectra of Ge‐clinopyroxenes CaM2+Ge2O6 (M2+ = Mg, Mn, Fe, Co, Ni, Zn), general formula M2M1T2O6, are reported for the first time. Their spectral features are discussed in comparison with corresponding Si‐pyroxenes. The vibrational wavenumbers of germanates may be roughly obtained by a scale factor of about ~0.8 by those of the corresponding silicates, due to the Ge‐Si mass difference. The main peaks in the germanate Raman spectra at ~850 and ~540 cm−1 may be related to Ge‐O tetrahedral stretching and chain bending, respectively; minor peaks between 200 and 400 cm−1 are ascribed to bending and stretching of the non‐tetrahedral cations. Within Ge‐pyroxenes, possible correlations between crystallographic parameters and the vibrational wavenumbers are investigated. The main stretching mode at ~850 cm−1 shows wavenumber changes with M2+ substitutions, but no simple correlation can be found with M2+ cation mass or size. On the other hand, the chain bending wavenumber linearly decreases with increasing ionic radius of the M2+ cation: the expansion of the M1 polyhedron reduces the chain kinking angle and the Ge‐Ge distances correspondingly increase. Copyright © 2015 John Wiley & Sons, Ltd.

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“…Most of these compounds crystallize into monoclinic C2/c symmetry. Magnetic clinopyroxenes Ca(Mn, Fe, Co, Ni)Ge 2 O 6 [16,17] order all in commensurate collinear antiferromagnetic structures. Among the reported Ca 2+ -bearing pyroxenes, only CaMnGe 2 O 6 allows for the linear magnetoelectric effect.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

et al. 2016

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We have investigated the magnetic and magnetoelectric properties of CaMnGe 2 O 6 by means of powder neutron diffraction, magnetic susceptibility, heat capacity, and electrical polarization measurements. The presence of one-dimensional short-range magnetic correlations within the MnO 6 octahedra chains well above long-range antiferromagnetic ordering (15 K) was evidenced. A one-dimensional antiferromagnetic correlation model along the zigzag chains was developed to fit the diffuse magnetic scattering. The linear magnetoelectric effect and pertinent ferrotoroidicity, allowed by the magnetic symmetry (C2 /c), have been verified experimentally and theoretically.

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Magnetic ordering and spin structure in Ca-bearing clinopyroxenes CaM2+(Si, Ge)2O6, M=Fe, Ni, Co, Mn

Cited by 37 publications

References 33 publications

Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
View full text Add to dashboard Cite

Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
View full text Add to dashboard Cite

Raman spectroscopy of CaM²⁺Ge₂O₆(M²⁺ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes

One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

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Magnetic ordering and spin structure in Ca-bearing clinopyroxenes CaM2+(Si, Ge)2O6, M=Fe, Ni, Co, Mn

Cited by 37 publications

References 33 publications

Spin-state transitions in CaFeSi2O6and NaFeSiStreltsov1, Skorikov2 2011Phys. Rev. B161150View full textAdd to dashboardCite

Spin-state transitions in CaFeSi2O6and NaFeSiStreltsov1, Skorikov2 2011Phys. Rev. B161150View full textAdd to dashboardCite

Raman spectroscopy of CaM2+Ge2O6(M2+ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes

One-dimensional short-range magnetic correlations in the magnetoelectric pyroxeneCaMnGe2O6

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Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
View full text Add to dashboard Cite

Spin-state transitions in CaFeSi2O6and NaFeSi
Streltsov
¹
,
Skorikov
²

2011
Phys. Rev. B
16
1
15
0
View full text Add to dashboard Cite

Raman spectroscopy of CaM²⁺Ge₂O₆(M²⁺ = Mg, Mn, Fe, Co, Ni, Zn) clinopyroxenes