In-situ X-ray Observation of Synthesizing Process for Rare-earth Transition-metal Pnictides under High Temperature and High Pressure

Sekine, Chihiro; Osanai, Hidetoshi; Ikemori, Keisuke; Nakajima, Ryosuke; Deminami, Shingo; Sirimart, Jirattagan; Gotou, Hirotada

doi:10.30919/esmm5f105

Cited by 4 publications

(4 citation statements)

References 14 publications

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“…This result is consistent with our previous report. 28) The maximum values of the lattice constant and the actual filling fraction of Tb for Tb x Co 4 Sb 12 are 9.061 ¡ and 0.15 at nominal Tb doping ratio x = 0.5, respectively. On the other hand, the lattice constant of Dy x Co 4 Sb 12 decreases with the increase of the nominal Dy doping ratio x (Fig.…”

Section: Sample Characterizationmentioning

confidence: 90%

“…The details about the preparation are described in our previous papers. 11,13,28) The reaction temperature and pressure were 600610°C and 24 GPa.…”

Section: Methodsmentioning

confidence: 99%

“…We have already reported a synthesis of Tb x Co 4 Sb 12 with the actual Tb filling fraction of x = 0.1 under high pressure. 28) This suggests a possibility of filling in structural voids of CoSb 3 by other heavy rare earths under high pressure.…”

Section: Introductionmentioning

confidence: 97%

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High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites RxCo4Sb12 (R = In, Tb and Dy)

et al. 2022

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Partially filled skutterudite compounds R x Co 4 Sb 12 (R = In, Tb and Dy, nominal composition 0.1 ¯x ¯1.5) were synthesized under high pressure using multi-anvil presses. The samples were analyzed by x-ray diffraction and scanning electron microscopy (SEM) with energydispersive x-ray spectrometry (EDX). The highest actual filling fraction x of In, Tb and Dy are 0.64, 0.22 and 0.15, respectively. The electron back-scatter diffraction (EBSD) result indicates that the grain size of In 0.8 Co 4 Sb 12 is 25 µm. Electrical resistivity, Seebeck coefficient, and thermal conductivity were measured between 2 K and 300 K. The maximum value of the dimensionless figure of merit ZT is 0.10 for nominal composition In 0.8 Co 4 Sb 12 at 300 K. We studied guest ion R dependence of lattice thermal conductivity ¬ L for R x Co 4 Sb 12 systematically based on a simple model for the rattling. The reduction rate of ¬ L of R x Co 4 Sb 12 can be scaled by a function of the guest free distance r GFD (the distance between R and Sb) and the atomic mass of R.

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Section: Sample Characterizationmentioning

confidence: 90%

“…The details about the preparation are described in our previous papers. 11,13,28) The reaction temperature and pressure were 600610°C and 24 GPa.…”

Section: Methodsmentioning

confidence: 99%

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High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites RxCo4Sb12 (R = In, Tb and Dy)

et al. 2022

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“…The relatively low initial coulombic efficiency for the Sr doped cathode materials is ascribed to that the discharge capacity decreases with an increase in the Sr amount in these Li-rich cathodes whereas the charging capacity only slightly changes. According to previous studies, the decrease in the discharge capacity is possible related to that the substitution of a certain percentage of Co by Sr, which [38][39][40] reduces the amount of Co redox species in the active mass. As can be seen from the comparison of the selected voltage curves of all electrodes, the discharge specific capacity of the sample is becomes more and more concentrated as the amount of the Sr increases, indicating that the effect of Sr doping on stabilization materials is valid.…”

Section: Electrochemical Performancementioning

confidence: 94%

Facile Fabrication Hierarchical Pore Structure Li1.2Mn0.54Ni0.13Co0.13-xSrxO2 Nanofiber for High-Performance Cathode Materials

Li¹,

Zhu²,

Ma³

et al. 2018

ES Mater.Manuf.

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The long-cycle life cathode material plays a key role in terms of energy and power density for lithium ion battery. In this work, a series of Srdoped hierarchical porous nanofiber structure Li Mn Ni Co Sr O are synthesized via electrospinning combined with high temperature 1.2 0.54 0.13 0.13-x x 2 solid phase technology. As a result, Sr-doping can enhance the cyclic performance, suppress the voltage decay and stabilize the structure. With the incorporation of Sr, not only the crystal structure and morphology of Li Mn Ni Co Sr O are slightly changed, but also both the 1.2 0.54 0.13 0.13-x x 2 specific capacity and discharge voltage of the Li rich cathode are stabilized upon cycling. When x = 0.03, Li Mn Ni Co Sr O delivers an 1.2 0.54 0.13 0.1 0.03 2-1 initial discharge capacity of 213 mAh g and a capacity retention of 94.16 % at the 100th cycle. The influence of the percentage of dopeed Sr on the performance of the battery is analyzed. Rational Sr dopeing technology is an effective way to improve the electrochemical performance of Li rich manganese based material.

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Mechanical properties of aluminium-graphene/carbon nanotubes (CNTs) metal matrix composites: Advancement, opportunities and perspective

Khanna

Kumar

Bansal

2021

Materials Research Bulletin

130

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In-situ X-ray Observation of Synthesizing Process for Rare-earth Transition-metal Pnictides under High Temperature and High Pressure

Cited by 4 publications

References 14 publications

High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites <i>R<sub>x</sub></i>Co<sub>4</sub>Sb<sub>12</sub> (<i>R</i> = In, Tb and Dy)

High-Pressure Synthesis and Thermoelectric Properties of Partially Filled Skutterudites <i>R<sub>x</sub></i>Co<sub>4</sub>Sb<sub>12</sub> (<i>R</i> = In, Tb and Dy)

Facile Fabrication Hierarchical Pore Structure Li1.2Mn0.54Ni0.13Co0.13-xSrxO2 Nanofiber for High-Performance Cathode Materials

Mechanical properties of aluminium-graphene/carbon nanotubes (CNTs) metal matrix composites: Advancement, opportunities and perspective

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