Probing magnetic order in LiMPO_4 (M = Ni, Co, Fe) and lithium diffusion in Li_xFePO_4

P. J. Baker; I. Franke; F. L. Pratt; T. Lancaster; D. Prabhakaran; W. Hayes; S. J. Blundell

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Probing magnetic order in LiMPO_4 (M = Ni, Co, Fe) and lithium diffusion in Li_xFePO_4

机译：探索LiMPO_4（M = Ni，Co，Fe）中的磁阶和Li_xFePO_4中的锂扩散

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Muon spin relaxation measurements are reported on three members of the Li_xMPO_4 series. The magnetic properties of stoichiometric samples with M = Ni, Co, Fe were investigated at low temperature. In LiNiPO_4 we observe different forms of the muon decay asymmetry in the commensurate and incommensurate antiferromagnetic phases, accompanied by a change in the temperature dependence of the muon oscillation frequency. In LiCoPO_4 the form of the muon decay asymmetry indicates that the correlation between layers decreases as the Neel temperature is approached from below. LiFePO_4 shows more conventional behavior, typical for a three-dimensional antiferromagnet. Measurements on Li_xFePO_4 with x = 0.8,0.9, and 1 show evidence for lithium diffusion below ～250 K and muon diffusion dominating the form of the relaxation at higher temperature. The thermally activated form of the observed hopping rate suggests an activation barrier for lithium diffusion of ～100 meV and a diffusion constant of D_(Li) ～ 10~(10) to 10~(-9) cm~2 s~(-1) at room temperature.

机译：在Li_xMPO_4系列的三个成员上报告了介子自旋弛豫测量。在低温下研究了M = Ni，Co，Fe的化学计量样品的磁性。在LiNiPO_4中，我们在相称和相称反铁磁相中观察到不同形式的μ子衰减不对称性，并伴随着μ子振荡频率的温度依赖性变化。在LiCoPO_4中，μon衰减不对称的形式表明，随着从下面接近Neel温度，层之间的相关性降低。 LiFePO_4显示了更常规的行为，这是三维反铁磁体的典型特征。对Li_xFePO_4的x = 0.8、0.9和1的测量结果表明，在〜250 K以下锂扩散且在较高温度下μ子扩散主导了弛豫形式。观察到的跳跃率的热活化形式表明锂扩散的活化势垒为〜100 meV，D_（Li）的扩散常数为10〜（10）至10〜（-9）cm〜2 s〜（-1））在室温下。

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来源
《Physical review》 |2011年第17期|p.174403.1-174403.8|共8页
作者
P. J. Baker; I. Franke; F. L. Pratt; T. Lancaster; D. Prabhakaran; W. Hayes; S. J. Blundell;
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作者单位

ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxon 0X11 OQX, United Kingdom;

Clarendon Laboratory, University of Oxford, Parks Road, Oxford 0X1 3PU, United Kingdom;

ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Oxon 0X11 OQX, United Kingdom;

Clarendon Laboratory, University of Oxford, Parks Road, Oxford 0X1 3PU, United Kingdom;

Clarendon Laboratory, University of Oxford, Parks Road, Oxford 0X1 3PU, United Kingdom;

Clarendon Laboratory, University of Oxford, Parks Road, Oxford 0X1 3PU, United Kingdom;

Clarendon Laboratory, University of Oxford, Parks Road, Oxford 0X1 3PU, United Kingdom;

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正文语种 eng
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muon spin rotation and relaxation; antiferromagnetics; lithium-ion batteries; diffusion;

机译：介子旋转和松弛;反铁磁锂离子电池;扩散;

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Probing magnetic order in LiMPO_4 (M = Ni, Co, Fe) and lithium diffusion in Li_xFePO_4

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