Magnetic signature of charge ordering in Li[Mn1.96Li0.04]O4 and Li0.2[Mn1.96Li0.04]O4

被引:0
作者
Verhoeven, VWJ [1 ]
de Schepper, IM [1 ]
Mulder, EM [1 ]
机构
[1] Delft Univ Technol, Interfac Reactor Inst, NL-2629 JB Delft, Netherlands
来源
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 2002年 / 74卷 / Suppl 1期
关键词
D O I
10.1007/s003390201606
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The stoichiometric compound LiMn2O4 is known to show charge ordering with well-defined Mn3+ and Mn4+ sites just below room temperature (RT). Above RT the electrons are hopping rapidly between sites. For lithium-ion batteries the material Li[Mn1.96Li0.04]O-4 is technologically relevant. Due to the small amount of Li on the Mn site, the low-T regular ordering of the Mn charge appears to be destroyed completely, as is evidenced by neutron diffraction in the magnetically ordered state. However, the charges are still fixed in an irregular fashion, as can also be deduced from Li-7 nuclear magnetic resonance measurements. In the lithium-extracted compound Li-0.2[Mn1.96Li0.04]O-4, predominantly Mn4+ is present. Neutron diffraction in the magnetically ordered state shows a well-defined antiferromagnetic ordering, with doubling of the unit cell in three directions. Clearly (a trivial type of) charge ordering occurs now, since almost only. Mn4+ is present.
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页码:S574 / S576
页数:3
相关论文
共 11 条
[1]   Influence of processing on the Li:Mn ratio in spinel phases of the system Li1+xMn2-xO4-delta [J].
Endres, P ;
Fuchs, B ;
KemmlerSack, S ;
Brandt, K ;
FaustBecker, G ;
Praas, HW .
SOLID STATE IONICS, 1996, 89 (3-4) :221-231
[2]   Structure and magnetism in λ-MnO2.: Geometric frustration in a defect spinel [J].
Greedan, JE ;
Raju, NP ;
Wills, AS ;
Morin, C ;
Shaw, SM ;
Reimers, JN .
CHEMISTRY OF MATERIALS, 1998, 10 (10) :3058-3067
[3]   PREPARATION OF A NEW CRYSTAL FORM OF MANGANESE-DIOXIDE - LAMBDA-MNO2 [J].
HUNTER, JC .
JOURNAL OF SOLID STATE CHEMISTRY, 1981, 39 (02) :142-147
[4]   Magnetic characterization of λ-MnO2 and Li2Mn2O4 prepared by electrochemical cycling of LiMn2O4 [J].
Jang, YI ;
Huang, B ;
Chou, FC ;
Sadoway, DR ;
Chiang, YM .
JOURNAL OF APPLIED PHYSICS, 2000, 87 (10) :7382-7388
[5]   Li mobility in the battery cathode material Lix[Mn1.96Li0.04]O4 studied by muon-spin relaxation [J].
Kaiser, CT ;
Verhoeven, VWJ ;
Gubbens, PCM ;
Mulder, FM ;
de Schepper, I ;
Yaouanc, A ;
de Réotier, PD ;
Cottrell, SP ;
Kelder, EM ;
Schoonman, J .
PHYSICAL REVIEW B, 2000, 62 (14) :R9236-R9239
[6]   Neutron scattering study of the charge ordering and the spin ordering of the magnetically frustrated spinel antiferromagnet [J].
Oohara, Y ;
Sugiyama, J ;
Kontani, M .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1999, 68 (01) :242-246
[7]   Electronic crystallization in a lithium battery material:: Columnar ordering of electrons and holes in the spinel LiMn2O4 [J].
Rodriguez-Carvajal, J ;
Rousse, G ;
Masquelier, C ;
Hervieu, M .
PHYSICAL REVIEW LETTERS, 1998, 81 (21) :4660-4663
[8]   Neutron scattering investigation of the spin dynamics in Li[Mn1.94Li0.04]O3.94 -: art. no. 214409 [J].
Schimmel, HG ;
Montfrooij, W ;
Kearley, GJ ;
Verhoeven, VWJ ;
de Schepper, IM .
PHYSICAL REVIEW B, 2001, 63 (21)
[9]   Lithium dynamics in LiMn2O4 probed directly by two-dimensional 7Li NMR [J].
Verhoeven, VWJ ;
de Schepper, IM ;
Nachtegaal, G ;
Kentgens, APM ;
Kelder, EM ;
Schoonman, J ;
Mulder, FM .
PHYSICAL REVIEW LETTERS, 2001, 86 (19) :4314-4317
[10]   Influence of Mn by Li substitution on the Jahn-Teller distortion in LiMn2O4 [J].
Verhoeven, VWJ ;
Mulder, FM ;
de Schepper, IM .
PHYSICA B, 2000, 276 (276) :950-951