Structural features of the superionic phase transitions in Na3Fe2(PO4)3

Кравченко, В. В.; Sigaryov, S.E.

doi:10.1016/0038-1098(92)90892-d

Cited by 17 publications

(16 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in the title compounds the remanent magnetization does not tend towards zero at 0 K, as could be expected if only ferrimagnetic behavior was present. Consequently, an additional factor, such as a slight canting of the magnetic moments of the Fe(1) and Fe (2) sublattices in the ordered state should be considered. This fact gives rise to the presence of a weak ferromagnetic moment in the compounds.…”

Section: Discussionmentioning

confidence: 99%

“…Magnetization and magnetic susceptibility measurements were performed with a Quantum Design MPMS-2 SQUID Magnetometer, in the 1.8± 300 K temperature range, with a maximum applied ®eld of 7 T. AC susceptibility measurements were performed at 1 Oe and 1 kHz, on a Quantum Design PPMS AC susceptometer. There are two independent iron positions in the structure of this compound, Fe(1) and Fe (2), which lead to the existence of two different FeO 6 octahedra ( Fig. 3a).…”

Section: Characterization and Physical Measurementsmentioning

confidence: 99%

See 1 more Smart Citation

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

et al. 2000

View full text Add to dashboard Cite

The Li 3 Fe 2 (AsO 4) 32x (PO 4) x (x~0, 1, 1.5, 2) solid solution was prepared by the ceramic method. Li 3 Fe 2 (AsO 4) 3 crystallizes in the monoclinic P112 1 /n space group with the cell parameters, a~8.608(1), b~12.215(1), c~8.929(1) A Ê and c~90.76(1)³. The structure consists of a three-dimensional framework of vertex-sharing FeO 6 octahedra and AsO 4 tetrahedra with the lithium ions distributed in three four-coordinated crystal sites. There are two independent iron positions in the structure of this compound, Fe(1) and Fe(2). The cell parameters of the isostructural Li 3 Fe 2 (AsO 4) 32x (PO 4) x (x~0, 1, 1.5, 2) phases follow Vegard's law. The IR spectra show the evolution of the intensity for the bands corresponding to the AsO 4 and PO 4 tetrahedra in the solid solution. An isotropic signal with a g value of 2.0 is observed in the ESR spectra of all compounds, in good agreement with the presence of a high spin Fe(III) ion with slightly distorted octahedral symmetry. The magnetization measurements and the magnetic DC and AC susceptibility data show an antiferromagnetic behavior for these compounds, with the presence of a ferromagnetic component below the ordering temperature. T N decreases from 35.5 to 31 K with decreasing the amount of arsenate. The magnetic results are explained by the existence of a phenomenon of ferrimagnetism in these compounds, due to the existence of two different magnetic sublattices, corresponding to the Fe(1) and Fe(2) sites. The presence of canting between the magnetic moments of these two sublattices has been also detected. This fact agrees with the relative orientation of the FeO 6 magnetic octahedra in the Li 3 Fe 2 (AsO 4) 32x (PO 4) x (x~0, 1, 1.5, 2) compounds.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Characterization and Physical Measurementsmentioning

confidence: 99%

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

et al. 2000

View full text Add to dashboard Cite

show abstract

“…In this study, Na 3 Fe 2 (PO 4 ) 3 as the cathode material for SIBs has been reported. The structure of monoclinic Na 3 Fe 2 (PO 4 ) 3 consists of corner-sharing PO 4 tetrahedra and FeO 6 octahedra that are like “lantern units”. − The skeleton structures are assembled into a three-dimensional framework defined by M(1) (one position per formula unit) and M(2) (three positions per formula unit) host sites in the rhombohedra. The M(1) and M(2) host sites are usually filled (fully or partially) with “guest” alkali ions (Li, Na).…”

Section: Introductionmentioning

confidence: 99%

Monoclinic Phase Na₃Fe₂(PO₄)₃: Synthesis, Structure, and Electrochemical Performance as Cathode Material in Sodium-Ion Batteries

Liu

Zhou

Zhang

et al. 2016

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Sodium iron phosphate (Na3Fe2(PO4)3) as cathode material for sodium-ion batteries has been synthesized through a simple method of a solid state reaction. It crystallizes in a monoclinic structure in the space group C2/c. The morphology of the as-prepared sample has been investigated by scanning electron microscopy and transmission electron microscopy. The charge/discharge curves show a very flat plateau at about 2.5 V (vs Na/Na+). The initial specific discharge capacity is 61 mAh g–1 and remains at 57 mAh g–1 after 500 cycles at a current rate of 1 C. X-ray photoelectron spectroscopy measurements indicate that not all of the Fe3+ of Na3Fe2(PO4)3 is reduced during the electrochemical process. The ex-situ X-ray diffraction measurements were applied to research the mechanism of sodium-ion storage; the results indicated that the Na3Fe2(PO4)3 compound partly transformed into Na4Fe2(PO4)3 and Na3+x Fe2(PO4)3 compound. These results testify to the potential of monoclinic Na3Fe2(PO4)3 as a cathode material in sodium-ion batteries.

show abstract

“…The refinement process is carried out via GSAS software. , During the refining process, the following instrumental and structural parameters are refined. The original parameters are derived from previous reports. − The detailed crystallographic information about the atomic fractional coordinates, atomic isotropic displacement parameters, and site occupancies after refining is summarized in Table S1. The refined results indicate that the crystal structure of synthesized NFP can be indexed using a monoclinic unit cell, and the lattice parameters are a = 15.011 Å, b = 8.685 Å, c = 8.687 Å, β = 126.5°, and V = 959.87 Å.…”

Section: Resultsmentioning

confidence: 99%

“…The common NASICON structure polyanionic compound cathode materials, such as Na 3 Zr 2 Si 2 PO 12 , NaFe 2 PO 4 (SO 4 ) 2 , , Na 3 V 2 (PO 4 ) 3 , − Na 3 V 2 (PO 4 ) 2 F 3 , − Na 4 Fe 7 (PO 4 ) 6 , and Na 4 Fe 3 (PO 4 ) 2 P 2 O 7 , have shown excellent electrochemical performance, high ionic conductivity, and high thermal stability in SIBs. Masquelier et al reported a new NASICON-type Na 3 Fe 2 (PO 4 ) 3 (NFP) with a larger ion-channel radius of 6.487 Å and presented its crystal structure model that was very suitable for Na + insertion–deinsertion. − Na 3 Fe 2 (PO 4 ) 3 as a cathode material in SIBs shows low production cost and high structural stability, which are very suitable for industrialization. Also, the commercial hard carbon (CHC) as a low-cost anode with a particular amorphous structure and high electronic conductivity has been widely used in LIBs, SIBs, and supercapacitors. − …”

Section: Introductionmentioning

confidence: 99%

Highly Stable Na₃Fe₂(PO₄)₃@Hard Carbon Sodium-Ion Full Cell for Low-Cost Energy Storage

Cao

Liu

Zhao

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Abundant flake-porous Na3Fe2(PO4)3 has been prepared via a simple spray drying method. As a cathode material in sodium-ion batteries (SIBs), the galvanostatic charge/discharge test results indicate that the initial reversible discharge specific capacity of the flake-porous Na3Fe2(PO4)3 electrode can reach to 100.8 mAh g–1 (about 93% of the theoretical capacity of 105 mAh g–1) under a current density of 10 mA g–1 (0.1 C) and the high rate capability at 500 mA g–1 (5 C) is up to 60 mAh g–1 after 1100 cycles. The in situ X-ray diffraction pattern and ex situ X-ray photoelectron spectroscopy results indicate that the charge/discharge processes of this cathode material go through a reversible electrochemical reaction of Na3Fe2(PO4)3/Na5Fe2(PO4)3. The outstanding electrochemical performance of Na3Fe2(PO4)3 is attributed to its [Fe2(PO4)3] “lantern unit”-stacked NASICON-type structure and two-dimensional (2D) porous-sheet morphology. The flake-porous Na3Fe2(PO4)3 cathode with a commercial hard carbon anode full cell shows an energy density of 76 Wh kg–1 and the maximum power density of up to 760 W kg–1. The full cell also shows excellent low-temperature performance even at −20 °C (40 mAh g–1 at 100 mA g–1). The outstanding electrochemical and low-temperature performances prove that this full cell is an ideal device for large-scale electrical energy storage (EES).

show abstract

Structural features of the superionic phase transitions in Na3Fe2(PO4)3

Cited by 17 publications

References 5 publications

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

Monoclinic Phase Na₃Fe₂(PO₄)₃: Synthesis, Structure, and Electrochemical Performance as Cathode Material in Sodium-Ion Batteries

Highly Stable Na₃Fe₂(PO₄)₃@Hard Carbon Sodium-Ion Full Cell for Low-Cost Energy Storage

Contact Info

Product

Resources

About

Structural features of the superionic phase transitions in Na3Fe2(PO4)3

Cited by 17 publications

References 5 publications

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

Structure and magnetic properties of Li3Fe2(AsO4)3 − x(PO4)x [x = 0, 1, 1.5, 2]: two sublattice weak ferromagnets

Monoclinic Phase Na3Fe2(PO4)3: Synthesis, Structure, and Electrochemical Performance as Cathode Material in Sodium-Ion Batteries

Highly Stable Na3Fe2(PO4)3@Hard Carbon Sodium-Ion Full Cell for Low-Cost Energy Storage

Contact Info

Product

Resources

About

Monoclinic Phase Na₃Fe₂(PO₄)₃: Synthesis, Structure, and Electrochemical Performance as Cathode Material in Sodium-Ion Batteries

Highly Stable Na₃Fe₂(PO₄)₃@Hard Carbon Sodium-Ion Full Cell for Low-Cost Energy Storage