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Yakubovich OV, Shvanskaya LV, Kiriukhina GV, Simonov SV, Volkov AS, Dimitrova OV, Glazkov VN, Ignatenko AN, Chung SH, Koo HJ, Whangbo MH, Vasiliev AN. K 2Mn 3O(OH)(VO 4)(V 2O 7) with Sawtooth Chains of Multivalent Manganese Triangular Trimer Units: Magnetic Susceptibility Shrouding a Long-Range Antiferromagnetic Order of Ferromagnetic Triangles. Inorg Chem 2023; 62:14180-14190. [PMID: 37595259 DOI: 10.1021/acs.inorgchem.3c01100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2023]
Abstract
ortho-Pyrovanadate (or ortho-diorthovanadate) K2Mn23+Mn2+O(OH)(VO4)(V2O7) synthesized hydrothermally crystallizes in the orthorhombic space group Pnma with a = 17.9155(5), b = 5.8940(2), c = 10.9971(3) Å, V = 1161.23(6) Å3, and Z = 4. Its crystal structure features linear chains of edge-sharing Mn3+O6 octahedra with every second pair of Mn3+O6 octahedra condensed with a Mn2+O6 octahedron on one side of a chain in a sawtooth pattern so that each sawtooth chain consists of a triangular trimer. These sawtooth chains, running parallel to the b axis and linked by the VO4 and V2O7 groups, form a framework with channels populated by K atoms. The new compound is a structural analogue of the mineral zoisite Ca2Al3O(OH)(SiO4)(Si2O7), showing a striking example of very different chemical compositions. K2Mn3O(OH)(VO4)(V2O7) undergoes a phase transition into an ordered antiferromagnetic (AFM) state at TN = 14.4 K, which was detected by high-frequency electron spin resonance as well as by both specific heat Cp and Fisher's specific heat d(χT)/dT measurements. However, this phase transition was not detected by magnetic susceptibility measurements. The origin of this puzzling observation was resolved by evaluating the spin exchanges of K2Mn3O(OH)(VO4)(V2O7), which revealed that each triangular trimer is a ferromagnetically coupled cluster, and the observed ordering involves an AFM ordering between the ferromagnetic (FM) clusters. This ordering is shrouded in magnetic susceptibility measurements due to the susceptibility contributions from the individual FM triangular trimers even below TN. We showed that the magnetic susceptibility of K2Mn3O(OH)(VO4)(V2O7) between ∼30 K and room temperature is satisfactorily described by an AFM chain made up of ferromagnetically coupled triangular clusters, as described by a few spin-exchange parameters.
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Affiliation(s)
| | - Larisa V Shvanskaya
- Lomonosov Moscow State University, Moscow 119991, Russia
- National University of Science and Technology "MISiS", Moscow 119049, Russia
| | - Galina V Kiriukhina
- Lomonosov Moscow State University, Moscow 119991, Russia
- Korzhinskii Institute of Experimental Mineralogy RAS, Chernogolovka 142432, Russia
| | - Sergey V Simonov
- Institute of Solid State Physics RAS, Chernogolovka 142432, Russia
| | - Anatoly S Volkov
- Skolkovo Institute of Science and Technology, Moscow 121205, Russia
| | | | - Vasiliy N Glazkov
- Kapitza Institute for Physical Problems, RAS, Moscow 119334, Russia
- HSE University, Moscow 101000, Russia
| | | | - Seung Hwan Chung
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Hyun-Joo Koo
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Myung-Hwan Whangbo
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Alexander N Vasiliev
- Lomonosov Moscow State University, Moscow 119991, Russia
- National University of Science and Technology "MISiS", Moscow 119049, Russia
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Javier-Ccallata H, Watanabe S. Crystal field effect on EPR and optical absorption properties of natural green zoisite. Spectrochim Acta A Mol Biomol Spectrosc 2013; 104:505-511. [PMID: 23291113 DOI: 10.1016/j.saa.2012.11.099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2012] [Revised: 11/25/2012] [Accepted: 11/27/2012] [Indexed: 06/01/2023]
Abstract
In this study the electron paramagnetic resonance (EPR) and optical absorption (OA) of natural crystal of zoisite were investigated after γ ((60)Co) irradiation and high temperature annealing. EPR measurements show that the zoisite from Tefilo Otoni MG Brazil contain Cr(3+), Fe(3+) and Mn(2+) ions and occupy distorted Al(3+) octahedral and tetrahedral sites which are subjected to the action of a strong crystal field in axial direction. Absorption bands which in principle give rise to sets of EPR lines between 500 and 2500 G were found using the deconvolution method. The application of high doses of gamma ray and high temperature annealing has shown no significant effects on EPR and OA spectra. Spin-allowed, spin-forbidden and crystal field parameters were calculated for 3d(3) configuration and interpreted using the spin Hamiltonian formalism containing axial and rhombic terms in low symmetries.
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Affiliation(s)
- Henry Javier-Ccallata
- Departamento de Física Nuclear, Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R, 187, CEP 05508-900, São Paulo, SP, Brazil.
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