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Biryukov YP, Zinnatullin AL, Bubnova RS, Vagizov FG, Shablinskii AP, Filatov SK, Shilovskikh VV, Pekov IV. Investigation of thermal behavior of mixed-valent iron borates vonsenite and hulsite containing [OM 4] n+ and [OM 5] n+ oxocentred polyhedra by in situ high-temperature Mössbauer spectroscopy, X-ray diffraction and thermal analysis. ACTA CRYSTALLOGRAPHICA SECTION B, STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS 2020; 76:543-553. [PMID: 32831273 DOI: 10.1107/s2052520620006538] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2020] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
The investigation of elemental composition, crystal structure and thermal behavior of vonsenite and hulsite from the Titovskoe boron deposit in Russia is reported. The structures of the borates are described in terms of cation-centered and oxocentred polyhedra. There are different sequences of double chains and layers consisting of oxocentred [OM4]n+ tetrahedra and [OM5]n+ tetragonal pyramids forming a framework. Elemental composition was determined by energy-dispersive X-ray spectroscopy (EDX). Oxidation states and coordination sites of iron and tin in the oxoborates are determined using Mössbauer spectroscopy and compared with EDX and X-ray diffraction data (XRD). According to results obtained from high-temperature Mössbauer spectroscopy, the Fe2+ to Fe3+ oxidation in vonsenite and hulsite occurs at approximately 500 and 600 K, respectively. According to the high-temperature XRD data, this process is accompanied by an assumed deformation of crystal structures and subsequent solid-phase decomposition to hematite and warwickite. It is seen as a monotonic decrease of volume thermal expansion coefficients with an increase in temperature. A partial magnetic ordering in hulsite is observed for the first time with Tc ≃ 383 K. Near this temperature, an unusual change of thermal expansion coefficients is revealed. Vonsenite starts to melt at 1571 K and hulsite melts at 1504 K. Eigenvalues of thermal expansion tensor are calculated for the oxoborates as well as anisotropy of the expansion is described in comparison with their crystal structures.
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Affiliation(s)
- Yaroslav P Biryukov
- Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova emb., 2, Saint Petersburg, 199034, Russian Federation
| | - Almaz L Zinnatullin
- Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russian Federation
| | - Rimma S Bubnova
- Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova emb., 2, Saint Petersburg, 199034, Russian Federation
| | - Farit G Vagizov
- Kazan Federal University, Kremlyovskaya Str., 18, Kazan, 420008, Russian Federation
| | - Andrey P Shablinskii
- Institute of Silicate Chemistry of the Russian Academy of Sciences, Makarova emb., 2, Saint Petersburg, 199034, Russian Federation
| | - Stanislav K Filatov
- Institute of Earth Sciences, Department of Crystallography, Saint Petersburg State University, Universitetskaya Emb., 7/9, Saint Petersburg, 199034, Russian Federation
| | - Vladimir V Shilovskikh
- Geomodel Resource Centre, Saint Petersburg State University, Ulyanovskaya Str., 1, Saint Petersburg, 198510, Russian Federation
| | - Igor V Pekov
- Faculty of Geology, Moscow State University, Leninskie Gory, 1, Moscow, 119991, Russian Federation
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Sofronova S, Nazarenko I. Ludwigites: From natural mineral to modern solid solutions. CRYSTAL RESEARCH AND TECHNOLOGY 2017. [DOI: 10.1002/crat.201600338] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- S. Sofronova
- L.V. Kirensky Institute of Physics; Siberian Branch of Russian Academy of Science; 660036 Krasnoyarsk Russia
| | - I. Nazarenko
- L.V. Kirensky Institute of Physics; Siberian Branch of Russian Academy of Science; 660036 Krasnoyarsk Russia
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Lee KH, Lee J, Dieckmann R. Anisotropy of the Electrical Conductivity of the Fayalite, Fe 2SiO 4, Investigated by Spin Dimer Analysis. B KOREAN CHEM SOC 2013. [DOI: 10.5012/bkcs.2013.34.2.629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Vallejo E, Avignon M. Spin and charge ordering in three-leg ladders in oxyborates. PHYSICAL REVIEW LETTERS 2006; 97:217203. [PMID: 17155770 DOI: 10.1103/physrevlett.97.217203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2006] [Indexed: 05/12/2023]
Abstract
We study the spin ordering within the three-leg ladders present in the oxyborate Fe3O2BO3 consisting of localized classical spins interacting with conduction electrons (one electron per rung). We also consider the competition with antiferromagnetic superexchange interactions to determine the magnetic phase diagram. Besides a ferromagnetic phase we find (i) a phase with ferromagnetic rungs ordered antiferromagnetically and (ii) a zigzag canted spin ordering along the legs. We also determine the induced charge ordering within the different phases and the interplay with lattice instability. Our model is discussed in connection with the lattice dimerization transition observed in this system, emphasizing the role of the magnetic structure.
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Affiliation(s)
- E Vallejo
- Laboratoire d'Etudes des Propriétés Electroniques des Solides (LEPES)-Centre National de la Recherche Scientifique (CNRS), Boîte Postale 166, F-38042 Grenoble Cedex 9, France
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Dai D, Whangbo MH, Koo HJ, Rocquefelte X, Jobic S, Villesuzanne A. Analysis of the Spin Exchange Interactions and the Ordered Magnetic Structures of Lithium Transition Metal Phosphates LiMPO4 (M = Mn, Fe, Co, Ni) with the Olivine Structure. Inorg Chem 2005; 44:2407-13. [PMID: 15792477 DOI: 10.1021/ic048431w] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The olivine-type compounds LiMPO4 (M = Mn, Fe, Co, Ni) consist of MO4 layers made up of corner-sharing MO6 octahedra of high-spin M2+ ions. To gain insight into the magnetic properties of these phosphates, their spin exchange interactions were estimated by spin dimer analysis using tight binding calculations and by electronic band structure analysis using first principles density functional theory calculations. Three spin exchange interactions were found to be important for LiMPO4, namely, the intralayer superexchange J1, the intralayer super-superexchange Jb along the b-direction, and the interlayer super-superexchange J2 along the b-direction. The magnetic ground state of LiMPO4 was determined in terms of these spin exchange interactions by calculating the total spin exchange interaction energy under the classical spin approximation. In the spin lattice of LiMPO4, the two-dimensional antiferromagnetic planes defined by the spin exchange J1 are antiferromagnetically coupled by the spin exchange J2, in agreement with available experimental data.
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Affiliation(s)
- D Dai
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA
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Spin exchange interactions and magnetic structures of extended magnetic solids with localized spins: theoretical descriptions on formal, quantitative and qualitative levels. J SOLID STATE CHEM 2003. [DOI: 10.1016/s0022-4596(03)00273-1] [Citation(s) in RCA: 267] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Koo HJ, Whangbo MH, Lee KS. Investigation of the spin exchange interactions and magnetic Structures of the CrVO4-type transition metal phosphates, sulfates, and vanadates by spin dimer analysis. Inorg Chem 2003; 42:5932-7. [PMID: 12971762 DOI: 10.1021/ic030115e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The CrVO(4)-type magnetic oxides MM'O(4) consist of edge-sharing MO(4) octahedral chains condensed with M'O(4) tetrahedra and exhibit a wide variety of magnetic structures. The magnetic properties of these oxides were examined by studying their spin exchange interactions on the basis of spin dimer analysis. The nature and magnitudes of the intra- and interchain spin exchange interactions depend on the square-to-rectangle distortion in the basal planes of the MO(4) chain and on the difference between the M 3d and O 2p orbital energies. The spiral magnetic structures of beta-CrPO(4) and MnSO(4) originate from the pseudohexagonal arrangement of the MO(4) chains and the frustrated interchain antiferromagnetic interactions.
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Affiliation(s)
- H-J Koo
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA
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Dai D, Whangbo MH. Spin exchange interactions of a spin dimer: Analysis of broken-symmetry spin states in terms of the eigenstates of Heisenberg and Ising spin Hamiltonians. J Chem Phys 2003. [DOI: 10.1063/1.1525809] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Koo HJ, Whangbo MH, VerNooy PD, Torardi CC, Marshall WJ. Flux growth of vanadyl pyrophosphate, (VO)(2)P(2)O(7), and spin dimer analysis of the spin exchange interactions of (VO)(2)P(2)O(7) and vanadyl hydrogen phosphate, VO(HPO(4)).0.5H(2)O. Inorg Chem 2002; 41:4664-72. [PMID: 12206689 DOI: 10.1021/ic020249c] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Large transparent blue crystals of vanadyl pyrophosphate, (VO)(2)P(2)O(7), were grown from a phosphorus pentoxide flux, and the single-crystal X-ray structure of (VO)(2)P(2)O(7) was determined with high precision. On the basis of spin dimer analysis, we examined the spin exchange interactions of (VO)(2)P(2)O(7) and its precursor VO(HPO(4)).0.5H(2)O. Our analysis of (VO)(2)P(2)O(7) using two high-precision crystal structures shows unambiguously that the V3-V4 chain has a larger spin gap than does the V1-V2 chain and that the super-superexchange (V-O...O-V) interaction is stronger than the superexchange (V-O-V) interaction in the V3-V4 chain while the opposite is true in the V1-V2 chain. Our analysis of VO(HPO(4)).0.5H(2)O reveals that the superexchange interaction must dominate over the super-superexchange interaction, in disagreement with the conclusion from a powder neutron scattering study of VO(DPO(4)).0.5D(2)O.
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Affiliation(s)
- Hyun-Joo Koo
- Central Research and Development, DuPont Company, Experimental Station, Wilmington, DE 19880-0262, USA
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