Verwey-Type Transition and Magnetic Properties of the LiMn2O4Spinels

Shimakawa, Yuichi; Numata, Tatsuji; Tabuchi, Junji

doi:10.1006/jssc.1997.7366

Cited by 148 publications

(130 citation statements)

References 9 publications

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“…The transition temperature T t and the distortion c/a have a moderate correlation to the electronic structure of the MnO 6 9 (Mn 3+ ) octahedron in the ground state because of the thermal excitation of electrons over the energy gap " (d z2 to d x2¹y2 orbital in tetragonal D 4h symmetry), " ³ k B T t £ (c/a ¹ 1), i.e., "/k B is approximately ³1400 K (see Fig. 3).…”

Section: Jahn-teller Transitionmentioning

confidence: 99%

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Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms

Yamada

2016

Electrochemistry

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"Abundance" is an important keyword in materials development. This is particularly the case for the energy storage sector, where materials themselves function as a storage host. The amount of materials is directly linked to the amount of energy stored in the device. In rechargeable batteries, transition metal elements are necessary to accommodate a large number of electrons/holes in a reversible redox reaction. Iron, as the fourth most abundant element in the earth's crust, is an ideal redox center, but practical storage electrodes with Fe redox have long been the "holy grail" of the lithium-ion battery since its commercialization in 1991. In this review article, the history of replacing Co with Mn and/or Fe in lithium battery electrodes is briefly reviewed followed by recent technical achievements toward more sustainable batteries using Na + as a guest ion, where the goal would be to discover a high voltage electrode material composed of Na and Fe without compromising the energy density. Further, our ultimate destination is set to high energy density aqueous lithium/sodium ion batteries, where the hydrate-melt electrolyte enables surprisingly high-voltage operation over 3 V. During materials identification and optimization, reaction mechanisms should be understood in a systematic way to provide a firm direction for strategic design. With this regards, important physicochemical properties of key materials will be introduced.

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Section: Jahn-teller Transitionmentioning

confidence: 99%

“…5). 4,6,7 3. Olivine LiFePO 4 Defeating some negative perspectives raised at an early stage of the development, LiFePO 4 has been commercialized and received the common agreement of the battery community as most promising for the next generation lithium battery cathode.…”

Section: Jahn-teller Transitionmentioning

confidence: 99%

Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms

Yamada

2016

Electrochemistry

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“…This is opposite to the experimental results, where a higher hardness was observed for the sintered material, the one with the lowest density. The second factor is grain size (12,(52)(53)(54)(55). It is known that as grain size increases, hardness/strength decreases.…”

Section: Microhardnessmentioning

confidence: 99%

Hot-Pressed Versus Sintered LiTi2(PO4)3

Wolfenstine¹,

Allen²,

Sumner³

2009

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Sensors and Electron Devices Directorate, ARLApproved for public release; distribution unlimited. Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. ii REPORT DOCUMENTATION PAGE

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“…With decreasing temperature, this compound exhibits the charge ordering at about 260 K, accompanied with a structural phase transition from the cubic to orthorhombic structure with a space group of Fddd and "3a×3a×a" super cell relative to the cubic phase. [6][7][8][9][10][11] The unit cell of the orthorhombic structure contains inequivalent Mn sites with the valences of +3 and +4. YBaCo 2 O 5 has an oxygen-deficient double perovskite structure containing corner-linked CoO 5 pyramids.…”

Section: Introductionmentioning

confidence: 99%

“…The inequivalent Co sites with the valences of +2 and +3 are alternately arranged in the unit cell. Although the cubic phase of LiMn 2 O 4 , and the tetragonal and intermediate orthorhombic phases of YBaCo 2 O 5 have the transition metal ions with the half-integer valences, their electrical conductivities are non-metallic, [8,[12][13][14][15][16][17] suggesting the short-range charge ordering. Then we have performed the local structural analyses by using PDFs obtained in the cubic phase of LiMn 2 O 4 and the tetragonal phase of YBaCo 2 O 5 to reveal the local lattice distortion caused by the short-range charge ordering.…”

Section: Introductionmentioning

confidence: 99%

Local Lattice Distortion Caused by Short-Range Charge Ordering in Transition Metal Oxides

Igawa¹,

Shamoto²,

Ikeda³

et al. 2015

Proceedings of the 2nd International Symposium on Science at J-Parc — Unlocking the Mysteries of Life, Matter and the Universe

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We have performed local structural analysis by using the atomic pair distribution function (PDF) on LiMn 2 O 4 and YBaCo 2 O 5 which contain the single Mn and Co sites with the half-integer valences of +3.5 and +2.5, respectively, to reveal the local lattice distortion caused by the short-range charge ordering. The local structure of cubic spinel compound LiMn 2 O 4 at room temperature determined by the PDF analysis has an orthorhombic lattice distortion and includes inequivalent Mn sites with the valences of +3 and +4. The local structure of tetragonal phase of YBaCo 2 O 5 at 450 K has an orthorhombic lattice distortion including the inequivalent Co 2+ and Co 3+ sites. These results suggest that the valence electrons are localized at their transition metal sites only with short-range correlation, resulting in the non-metallic conductivity in these materials.

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Verwey-Type Transition and Magnetic Properties of the LiMn2O4Spinels

Cited by 148 publications

References 9 publications

Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms

Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms

Hot-Pressed Versus Sintered LiTi2(PO4)3

Local Lattice Distortion Caused by Short-Range Charge Ordering in Transition Metal Oxides

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Verwey-Type Transition and Magnetic Properties of the LiMn2O4Spinels

Cited by 148 publications

References 9 publications

Systematic Studies on &ldquo;Abundant&rdquo; Battery Materials: Identification and Reaction Mechanisms

Systematic Studies on &ldquo;Abundant&rdquo; Battery Materials: Identification and Reaction Mechanisms

Hot-Pressed Versus Sintered LiTi2(PO4)3

Local Lattice Distortion Caused by Short-Range Charge Ordering in Transition Metal Oxides

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Product

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Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms

Systematic Studies on “Abundant” Battery Materials: Identification and Reaction Mechanisms