Antiferromagnetism in LiFePO4

Santoro, R.P.; Newnham, R. E.

doi:10.1107/s0365110x67000672

Cited by 216 publications

(210 citation statements)

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“…40 ' 53 Thus, the discontinuity should reflect a noticeable change in electronic structure (as probed by Li), consistent with formation of the solid solution phases 7 ' 10 and/or (additional) mobility between 150°C and 200°C. This point is discussed in more detail below.…”

mentioning

confidence: 86%

“…2a). 40 The cations in one of the latter pairs are connected through two oxide ions, leading to a total of four Fe-O-Li contacts with angles near 90° (table 2). One of these oxide ions also links Li to iron ions of another pair (for a total of two contacts at 111.0°), while the third pair is linked through single oxide ions at 121.5°, also leading to a total of two Fe-O-Li contacts.…”

Section: Xrd Phase Analysis Phemical Oxidation Of Lifep04 Crystals Pmentioning

confidence: 99%

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MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

et al. 2010

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6 ' 7 Li and 3I P NMR experiments were conducted on a series of single-or twophase samples in the LiFePCvFePCM system with different overall lithium contents, and containing the two end-members and/or two metastable solid solution phases, Lio.6FeP04 or Lio.34FeP04. These experiments were carried out at different temperatures in order to search for vacancy/charge ordering and ion/electron mobility in the metastable phases.Evidence for Li + -Fe 2+ interactions was observed for both Lio.6FeP04 and Lio.34FePC>4.The strength of this interaction leads to the formation of LiFePCvlike clusters in the latter, as shown by the room temperature data. Different motional processes are proposed to exist as the temperature is increased and various scenarios are discussed. While concerted lithium-electron hopping and/or correlations explains the data below 125°C, evidence for some uncorrelated motion is found at higher temperatures, together with the onset of phase mixing.2

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mentioning

confidence: 86%

Section: Xrd Phase Analysis Phemical Oxidation Of Lifep04 Crystals Pmentioning

confidence: 99%

MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

et al. 2010

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“…Later, in 1960's, many investigations were made on these olivine phosphates but all are limited to crystallographic studies and then determining their magnetic properties to a greater extent [2][3][4]. In 1997, Padhi et al demonstrated the electrochemical energy storage capability on these olivine phosphates for the first time on using LiFePO 4 as a cathode for rechargeable battery applications [5].…”

Section: Introductionmentioning

confidence: 99%

Role of structural defects in olivine cathodes

Kandhasamy

Kalaiselvi

Minakshi

2012

Progress in Solid State Chemistry

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The high rate capability and structural stability of the olivine phosphates attracted a lot of interest as promising cathode materials for high energy density batteries. Alteration on these cathode materials, for instance, reducing particle size, conductive coating and metal ion doping were performed in order to improve the conductivity and to obtain high specific Li + diffusion. However, the drastic improvement in electrical conductivity for the aliovalent doping is still unclear. Rather writing a lengthy standard review, this manuscript intends to describe briefly the lattice defects owing to metal ion doping and its influence in improving the cathode performance of the olivine phosphates. This gives a new approach in this field.

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“…The structure of the LiMPO 4 compounds has been studied since the early 1960s. [12][13][14] They are insulators which, crystallographically, belong to the orthorhombic olivine family. 15 The orthorhombic cell contains four formula units and belongs to the space group Pnma (No.…”

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confidence: 99%

“…62, D 16 2h ). [16][17][18] Below the Néel temperature T N , which ranges between 20.8 and 50 K, 13,14,19 long-range AFM order emerges in all four compounds. Originally, neutron diffraction revealed the same type of compensated spin arrangement for all four compounds with differences in the spin direction only: 20 along x for Mn 2+ , along y for Co 2+ and Fe 2+ , and along z for Ni 2+ .…”

mentioning

confidence: 99%

Antiferromagnetic order in Li(Ni1−xFex)PO4(
Zimmermann
¹
,
Sondermann
²
,
Li
³

et al. 2013
Phys. Rev. B
2
0
6
0
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The investigation of Li(Ni 1−x Fe x )PO 4 by optical second harmonic generation yields the competition of the antiferromagnetic (AFM) structures and 180 • domain patterns found in the end compounds LiNiPO 4 (point group mm ′ m, spins along z) and LiFePO 4 (point group mmm ′ , spins along y). While AFM order and the distribution of the AFM domains of LiNiPO 4 are unaffected by the ion substitution at x = 0.06, striking changes are observed at x = 0.20. We find that Fe 2+ is dominant in establishing the magnetic order. For x = 0.20 we find that the magnetic order of the solid solution interpolates the magnetic order of its end compounds by exhibiting an orientation of the spins in the (100) plane which include an angle of 40 • ± 3 • with respect to the y axis toward 0 K (point group m). In contrast to the two end members, the associated AFM domains form rods of a few mm length and ∼ 10 µm width occurring in neither of the end compounds. Mechanisms responsible for the magnetic order and domain pattern (180 • domains still being one of the least explored aspects of AFM materials in spite of their omnipresence) are discussed.

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Antiferromagnetism in LiFePO4

Cited by 216 publications

References 0 publications

MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

Role of structural defects in olivine cathodes

Antiferromagnetic order in Li(Ni1−xFex)PO4(
Zimmermann
¹
,
Sondermann
²
,
Li
³

et al. 2013
Phys. Rev. B
2
0
6
0
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Antiferromagnetism in LiFePO4

Cited by 216 publications

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MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO4/FePO4 System

MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO4/FePO4 System

Role of structural defects in olivine cathodes

Antiferromagnetic order in Li(Ni1−xFex)PO4(Zimmermann1, Sondermann2, Li3 et al. 2013Phys. Rev. B2060View full textAdd to dashboardCite

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MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

MAS NMR Study of the Metastable Solid Solutions Found in the LiFePO₄/FePO₄ System

Antiferromagnetic order in Li(Ni1−xFex)PO4(
Zimmermann
¹
,
Sondermann
²
,
Li
³

et al. 2013
Phys. Rev. B
2
0
6
0
View full text Add to dashboard Cite