Application of a layered triangular-lattice magnetic model system to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">LiNiO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ganguly, P.; Ramaswamy, V.; Mulla, I.S.; Shinde, Rushikesh; Bakare, P. P.; Ganapathy, S.; Rajamohanan, Pattuparambil R.; Prakash, N. V. K.

doi:10.1103/physrevb.46.11595

Cited by 25 publications

(15 citation statements)

References 22 publications

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“…This behavior was also reported by several groups by magnetization and electron-spin-resonance measurements. 22,24,25,37,41,48 Furthermore, such behavior was reported even for Li 0.98 Ni 1.02 O 2 under H = 10 Oe. 37 In order to know the change in the microscopic magnetism for Li 0.85 Ni 1.15 O 2 , Fig.…”

Section: A Susceptibility Anomaly Around 300 Kmentioning

confidence: 79%

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

et al. 2010

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In order to elucidate the effect of Ni ions in the Li layer on magnetism and Li diffusion of LiNiO 2 , we have measured muon-spin rotation and muon-spin relaxation ͑ + SR͒ spectra for the polycrystalline Li 1−x Ni 1+x O 2 samples with x = 0.02, 0.03, and 0.15. Weak transverse-field-+ SR measurements demonstrated the existence of a bulk ferromagnetic transition at T m =48͑6͒ K for the x = 0.03 sample and 161͑7͒ K for x = 0.15 while the x = 0.02 sample exhibited an antiferromagnetic transition at 18͑4͒ K. Zero-magnetic-field-͑ZF͒ + SR measurements below T m clarified the formation of static ferromagnetic ͑FM͒ order for the x = 0.03 and 0.15 samples but only a highly disordered antiferromagnetic ͑AF͒ order for the x = 0.02 sample. Therefore, the variation in the low-T magnetism with x is most unlikely due to the change in the concentration of an AF NiO-type domain or an FM Ni-rich cluster but likely due to a homogeneous change in the whole system. In the paramagnetic state, ZF-and longitudinal-field-+ SR spectra exhibited a dynamic nuclear field relaxation. From the temperature dependence of the field fluctuation rate, a diffusion coefficient of Li + ions ͑D Li ͒ at 300 K was estimated about 0.39͑3͒ ϫ 10 −11 cm 2 / s for the x = 0.02 sample and 0.12͑7͒ ϫ 10 −11 cm 2 / s for x = 0.15. On the other hand, the related compound, LiCrO 2 , did not show any diffusive behavior even at the highest temperature measured ͑=475 K͒. Considering the hindrance of diffusion by Ni in the Li + diffusion plane and the fact that LiCrO 2 is electrochemically inactive, the estimated D Li is thought to be very reasonable for the positive electrode material of Li-ion batteries. Furthermore, at low temperatures where the Li + ions are static, the internal magnetic field was still found to be fluctuating, due to a dynamic local Jahn-Teller distortion of the Ni 3+ ions in a low-spin state with S =1/ 2͑t 2g 6 e g 1 ͒.

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Section: A Susceptibility Anomaly Around 300 Kmentioning

confidence: 79%

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

et al. 2010

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“…The 7 Li MASS NMR from these compounds show only one line. 20 Lines P and P′ are likely to be associated with a site that has close to an axially symmetric CSA tensor. If the position of line P (δ CS (P) ) 13 660 ( 20 ppm) corresponds to the σ 11 ) σ 22 component and line P′ (δ CS (P′) ) 14 780 ( 20 ppm) being the σ 33 component, the isotropic position, σ () 1 / 3 (σ 11 + σ 22 + σ 33 )) is expected to be ∼14 030 ( 20 ppm.…”

Section: Iii234 Spinning Sidebandsmentioning

confidence: 99%

Evidence for Multiple M Sites in AMO₂ Compounds: ⁵⁹Co Solid State NMR Studies on LiCoO₂

et al. 1997

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The layered AMO 2 compounds (A ) alkali metal, M ) trivalent octahedral site cations) derived from the simple rock-salt structure have always been considered to have only one crystallographic site for the A and the M atoms. These structures are described in terms of close-packed oxygen layers with interstitial A and M atoms, especially when A ) Li. This gives a layer sequence (AO) -and (MO) + . The AMO 2 compounds are part of the compounds in the A-M-O systems such as A 2 MO 3 and A 5 MO 6 , which are derived from the rock-salt structure with alternating layers of pure (AO) -and mixed [(A,M)O] + layers with multiple interstitial octahedral sites in the (A,M)O layer for occupation by the different A and M cations. Evidence is presented from 59 Co NMR experiments on LiCoO 2 for the existence of at least two sites in the (CoO) + layer. Several NMR methodologies, such as the use of various pulse sequence, nutation experiments, and magic angle sample spinning (MASS) are employed. Magic-angle-sample-spinning experiments show only one isotropic peak.However, an analysis of spinning sidebands envelope at various spinning speeds clearly shows the presence of at least two sites. One of these has orthorhombic symmetry and another has axial symmetry, with closely related chemical shift anisotropy components that result in the observation of nearly identical isotropic chemical shifts. The possible importance of the absence or presence of holes on oxygen has been discussed in accounting for the two sites.

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“…24,35,36 LiNiO 2 was also reported as a weakly coupled 2D ferromagnet. 27,28,36 It appears therefore that knowledge of the local structure in LiNiO 2 is crucial for the understanding of its electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

6/7Li NMR study of the Li1-zNi1+zO2 phases

Chazel¹,

Ménétrier²,

Croguennec³

et al. 2005

Magn. Reson. Chem.

186

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A series of Li1-zNi1+zO2 materials have been synthesised by the coprecipitation route. An X-ray diffraction study was carried out on these materials using the Rietveld method to determine the departure from the ideal stoichiometry z, which ranges from 0 to 0.138. The actual Li/Ni ratio was also checked by chemical analyses using inductively coupled plasma (ICP) for each sample. The stoichiometric sample (z approximately 0) was obtained using a 15% Li excess. (6/7)Li NMR results from LiNiO2 (z approximately 0) show that the asymmetric shape of the NMR signal is due to anisotropy. Calculations give evidence that the paramagnetic dipolar interaction from the electron spins carried by Ni is anisotropic but does not completely explain the experimental anisotropy. (6)Li MAS NMR (magic angle spinning NMR) experiments and temperature standardisation NMR measurements unambiguously assign the isotropic position at +726 ppm. The static-echo NMR spectra of the non-stoichiometric Li1-zNi1+zO2 phases also exhibit an asymmetric shape whose width increases with the departure from the ideal stoichiometry z. (6/7)Li static and MAS NMR show that the 2zNi(2+) ions thus formed modify the dipolar interaction within the materials and also affect the Fermi contact interaction, since a distribution of Li environments is observed using (6)Li NMR for non-stoichiometric samples.

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Application of a layered triangular-lattice magnetic model system toLiNiO2

Cited by 25 publications

References 22 publications

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

Evidence for Multiple M Sites in AMO₂ Compounds: ⁵⁹Co Solid State NMR Studies on LiCoO₂

6/7Li NMR study of the Li1-zNi1+zO2 phases

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Application of a layered triangular-lattice magnetic model system toLiNiO2

Cited by 25 publications

References 22 publications

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

Evidence for Multiple M Sites in AMO2 Compounds: 59Co Solid State NMR Studies on LiCoO2

6/7Li NMR study of the Li1-zNi1+zO2 phases

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Evidence for Multiple M Sites in AMO₂ Compounds: ⁵⁹Co Solid State NMR Studies on LiCoO₂