Magnetic interactions in layered LiNiO2 revealed by EPR of Ni3+

Stoyanova, Р.; Zhecheva, E.; Friebel, C.

doi:10.1016/0022-3697(93)90107-3

Cited by 38 publications

(36 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the literature, many different magnetic ground states have been proposed for LiNiO 2 : the system has been considered as a possible quantum spin liquid [8], a 2D frustrated antiferromagnet [11], a weakly coupled 2D Ising ferromagnet [9], a 2D Heisenberg ferromagnet [12], a spin glass [13,15], and more recently, as the physical realisation of a quantum spin-orbital liquid [5,16,17,25,26,28]. It is now clear that some of these interpretations have been motivated by different samples, as the magnetic properties of Li 1−x Ni 1+x O 2 are extremely sensitive to the preparation conditions [7,13,14,18].…”

Section: Magnetic Properities Liniomentioning

confidence: 99%

Orbital and Spin Order in the Triangular S=1/2 Layered Compound (LI,NA)NIO2

Brion

Núñez-Regueiro

Chouteau

2005

Frontiers in Magnetic Materials

View full text Add to dashboard Cite

Section: Magnetic Properities Liniomentioning

confidence: 99%

Orbital and Spin Order in the Triangular S=1/2 Layered Compound (LI,NA)NIO2

Brion

Núñez-Regueiro

Chouteau

2005

Frontiers in Magnetic Materials

View full text Add to dashboard Cite

“…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

View full text Add to dashboard Cite

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.

show abstract

“…During lithium deintercalation, the Fermi level is displaced from the Ni>/Ni> redox couple to the Ni>/Ni> one with an important modification in the physical properties (15,16). Substitution of cobalt for nickel reduces the excess of nickel ions and, therefore, leads to the presence of only one oxidation state for the transition metal ions in the LiNi \W Co W O starting phases (y50.2) (17).…”

mentioning

confidence: 98%