Hydrothermal synthesis, characterization and magnetic properties of NaVGe2O6 and LiVGe2O6

Emirdag‐Eanes, Mehtap; Kolis, Joseph W.

doi:10.1016/j.materresbull.2004.04.001

Cited by 13 publications

(13 citation statements)

References 13 publications

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“…In contrast to NaVGe 2 O 6 , there is no striking disagreement about the crystal structure of LiVGe 2 O 6 in Ref. 4,24. However, we were not able to reproduce distances presented in Ref.…”

Section: Computational Detailscontrasting

confidence: 61%

“…However, we were not able to reproduce distances presented in Ref. 24 from their crystal structure. Therefore, the study of electronic and magnetic properties of both NaVGe 2 O 6 and LiVGe 2 O 6 was postponed for the future, when all the problems about the crystal structure of these compounds would be resolved.…”

Section: Computational Detailsmentioning

confidence: 94%

“…Although all the studies were performed for the room temperature, the difference in lattice parameters exceeds 0.3Å for NaVGe 2 O 6 [4,24]. There is also uncertainty about the space group for this material [24,25].…”

Section: Computational Detailsmentioning

confidence: 99%

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Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
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The results of the LSDA+U calculations for pyroxenes with diverse magnetic properties (Li,Na)TM(Si,Ge)2O6, where TM is the transition metal ion (Ti,V,Cr,Mn,Fe), are presented. We show that the anisotropic orbital ordering results in the spin-gap formation in NaTiSi2O6. The detailed analysis of different contributions to the intrachain exchange interactions for pyroxenes is performed both analytically using perturbation theory and basing on the results of the band structure calculations. The antiferromagnetic t2g − t2g exchange is found to decrease gradually in going from Ti to Fe. It turns out to be nearly compensated by ferromagnetic interaction between half-filled t2g and empty eg orbitals in Cr-based pyroxenes. The fine-tuning of the interaction parameters by the crystal structure results in the ferromagnetism for NaCrGe2O6. Further increase of the total number of electrons and occupation of eg sub-shell makes the t2g − eg contribution and total exchange interaction antiferromagnetic for Mn-and Fe-based pyroxenes. Strong oxygen polarization was found in Fe-based pyroxenes. It is shown that this effect leads to a considerable reduction of antiferromagnetic intrachain exchange. The obtained results may serve as a basis for the analysis of diverse magnetic properties of pyroxenes, including those with recently discovered multiferroic behavior.

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“…In contrast to NaVGe 2 O 6 , there is no striking disagreement about the crystal structure of LiVGe 2 O 6 in Ref. 4,24. However, we were not able to reproduce distances presented in Ref.…”

Section: Computational Detailscontrasting

confidence: 61%

Section: Computational Detailsmentioning

confidence: 94%

See 1 more Smart Citation

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
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“…from P2 1 /c to C2/c, to higher temperatures or lower pressures, as demonstrated, for example, for LiFeGe 2 O 6 (Redhammer et al, 2010;Nestola et al, 2009). For the NaM 3+ Ge 2 O 6 system, the structures of NaFeGe 2 O 6 (Redhammer et al, 2011), NaCrGe 2 O 6 (Redhammer, Roth, Topa & Amthauer, 2008;Nenert et al, 2009), NaVGe 2 O 6 (Emirdag-Eanes & Kolis, 2004), NaMnGe 2 O 6 (synthesized at high pressure; Chen et al, 2013) and NaScGe 2 O 6 (Genkina et al, 1985) have been reported. For the latter compound, only isotropic atomic displacement parameters were given.…”

Section: Introductionmentioning

confidence: 75%

Pyroxene-type compounds NaM³⁺Ge₂O₆, withM= Ga, Mn, Sc and In

Redhammer

Tippelt

2014

Acta Crystallogr C

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The four title compounds, namely sodium gallium germanate, NaGaGe2O6, sodium manganese vanadate germanate, NaMnV0.1Ge1.9O6, sodium scandium germanate, NaScGe2O6, and sodium indium germanate, NaInGe2O6, adopt the high-temperature structure of the pyroxene-type chain germanates, with monoclinic symmetry and space group C2/c. The lattice parameters, the individual and average bond lengths involving M1, and the distortion parameters scale well with the ionic radius of the M1 cation. NaGaGe2O6 has more distorted M1 sites and more extended tetrahedral chains than NaInGe2O6, in which a high degree of kinking is required to maintain the connection between the octahedral and tetrahedral building units of the pyroxene structure. An exceptional case is NaMnGe2O6, in which the strong Jahn-Teller effect of Mn(3+) results in more distorted octahedral sites than expected according to linear extrapolation from the other NaM(3+)Ge2O6 pyroxenes. In contrast with the literature, minor incorporations of V(5+) in the tetrahedral site and a corresponding reduction of Mn(3+) to Mn(2+) in the octahedral sites in the present sample lower the Jahn-Teller distortion and stabilize the Mn-bearing pyroxene, even allowing its synthesis at ambient pressure.

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“…Structural parameters of SrMn(VO 4 )(OH) at 300 K (s.g. P2 1 2 1 2 1 (no 19),. Z= 4, a = 6.1322(13) Å, b = 7.7201(19) Å, c = 9.414(2) Å; R1 = 0.0175, wR2 = 0.0405; Flack x = -0.010(6))…”

mentioning

confidence: 99%

Structural and magnetic characterization of the one-dimensionalS=5/2antiferromagnetic chain systemSrMn(VO4
Sanjeewa
¹
,
Garlea
²
,
McGuire
³

et al. 2016
Phys. Rev. B
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The descloizite-type compound, SrMn(VO 4 )(OH), was synthesized as large single crystals (1-2mm) using a high-temperature high-pressure hydrothermal technique. X-ray single crystal structure analysis reveals that the material crystallizes in the acentric orthorhombic space group of P2 1 2 1 2 1 (no. 19), Z = 4. The structure exhibits a one-dimensional feature, with [MnO 4 ] ∞ chains propagating along the a-axis which are interconnected by VO 4 tetrahedra. Raman and infrared spectra were obtained to identify the fundamental vanadate and hydroxide vibrational modes. Magnetization data reveal a broad maximum at approximately 80 K, arising from onedimensional magnetic correlations with intrachain exchange constant of J/k B = 9.97(3) K between nearest Mn neighbors and a canted antiferromagnetic behavior below T N = 30 K. Single crystal neutron diffraction at 4 K yielded a magnetic structure solution in the lower symmetry of the magnetic space group P2 1 with two unique chains displaying antiferromagnetically ordered Mn moments oriented nearly perpendicular to the chain axis. The presence of the Dzyaloshinskii-Moriya antisymmetric exchange interaction leads to a slight canting of the spins and gives rise to a weak ferromagnetic component along the chain direction.

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Hydrothermal synthesis, characterization and magnetic properties of NaVGe2O6 and LiVGe2O6

Abstract: Supercritical fluids are shown to be an excellent reaction media for the synthesis of novel solid state phases at intermediate temperatures.

Cited by 13 publications

References 13 publications

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
View full text Add to dashboard Cite

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
View full text Add to dashboard Cite

Pyroxene-type compounds NaM³⁺Ge₂O₆, withM= Ga, Mn, Sc and In

Structural and magnetic characterization of the one-dimensionalS=5/2antiferromagnetic chain systemSrMn(VO4
Sanjeewa
¹
,
Garlea
²
,
McGuire
³

et al. 2016
Phys. Rev. B
Self Cite
35
0
9
0
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Hydrothermal synthesis, characterization and magnetic properties of NaVGe2O6 and LiVGe2O6

Abstract: Supercritical fluids are shown to be an excellent reaction media for the synthesis of novel solid state phases at intermediate temperatures.

Cited by 13 publications

References 13 publications

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2Streltsov1, Khomskii2 2008Phys. Rev. B884550View full textAdd to dashboardCite

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2Streltsov1, Khomskii2 2008Phys. Rev. B884550View full textAdd to dashboardCite

Pyroxene-type compounds NaM3+Ge2O6, withM= Ga, Mn, Sc and In

Structural and magnetic characterization of the one-dimensionalS=5/2antiferromagnetic chain systemSrMn(VO4Sanjeewa1, Garlea2, McGuire3 et al. 2016Phys. Rev. BSelf Cite35090View full textAdd to dashboardCite

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Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
View full text Add to dashboard Cite

Electronic structure and magnetic properties of pyroxenes(Li,Na)TM(Si,Ge)2
Streltsov
¹
,
Khomskii
²

2008
Phys. Rev. B
88
4
55
0
View full text Add to dashboard Cite

Pyroxene-type compounds NaM³⁺Ge₂O₆, withM= Ga, Mn, Sc and In

Structural and magnetic characterization of the one-dimensionalS=5/2antiferromagnetic chain systemSrMn(VO4
Sanjeewa
¹
,
Garlea
²
,
McGuire
³

et al. 2016
Phys. Rev. B
Self Cite
35
0
9
0
View full text Add to dashboard Cite