Non-monotonic lattice parameter variation in ball-milled ceria

Banerjee, Amitava; Gupta, Rajeev; Balani, Kantesh

doi:10.1007/s10853-015-9182-y

Cited by 14 publications

(10 citation statements)

References 37 publications

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“…That is to say, the sand‐grinding process degrades the degree of crystallinity by widening the interplanar crystal spacing, which is caused by the introduced stress. [ 15 ] The reduced degree of crystallinity is also evidenced by the selected area electron diffraction (SEAD) pattern (see the insets of Figure 3a,d). The clear and well‐ordered spots are observed for the non‐sand‐grinding sample, whereas the weak and blurry ones for the sand‐grinding sample.…”

Section: Resultsmentioning

confidence: 94%

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Liao

Sun

et al. 2023

Adv Funct Materials

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Although the piezo‐catalysis is promising for the environmental remediation and biomedicine, the piezo‐catalytic properties of various piezoelectric materials are limited by low carrier concentrations and mobility, and rapid electron‐hole pair recombination, and reported regulating strategies are quite complex and difficult. Herein, a new and simple strategy, integrating phase boundary engineering and defect engineering, to boost the piezo‐catalytic activity of potassium sodium niobate ((K, Na)NbO3, KNN) based materials is innovatively proposed. Tur strategy is validated by exampling 0.96(K0.48Na0.52)Nb0.955Sb0.045O3‐0.04(BixNa4‐3x)0.5ZrO3‐0.3%Fe2O3 material having phase boundary engineering and conducted the defect engineering via the high‐energy sand‐grinding. A high reaction rate constant k of 92.49 × 10−3 min−1 in the sand‐grinding sample is obtained, which is 2.40 times than that of non‐sand‐grinding one and superior to those of other representative lead‐free perovskite piezoelectric materials. Meanwhile, the sand‐grinding sample has remarkable bactericidal properties against Escherichia coli and Staphylococcus aureus. Superior piezo‐catalytic activities originate from the enhanced electron‐hole pair separation and the increased carrier concentration. This study provides a novel method for improving the piezo‐catalytic activities of lead‐free piezoelectric materials and holds great promise for harnessing natural energy and disease treatment.

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Section: Resultsmentioning

confidence: 94%

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Liao

Sun

et al. 2023

Adv Funct Materials

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“…With the increase in lattice defects, the activation energy of interdiffusion would be vastly reduced. Regarding amorphization, it has been well discussed concerning the mechanical alloying of crystalline powders into amorphous metals with similar or higher melting points. − …”

Section: Resultsmentioning

confidence: 99%

Li-Ion Conductivity of Single-Step Synthesized Glassy-Ceramic Li₁₀GeP₂S₁₂ and Post-heated Highly Crystalline Li₁₀GeP₂S₁₂

Lü

Windmüller

Schmidt

et al. 2023

ACS Appl. Mater. Interfaces

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Li 10 GeP 2 S 12 is a phosphosulfide solid electrolyte that exhibits exceptionally high Li-ion conductivity, reaching a conductivity above 10 −3 S cm −1 at room temperature, rivaling that of liquid electrolytes. Herein, a method to produce glassy-ceramic Li 10 GeP 2 S 12 via a single-step utilizing high-energy ball milling was developed and systematically studied. During the high energy milling process, the precursors experience three different stages, namely, the 'Vitrification zone' where the precursors undergo homogenization and amorphization, 'Intermediary zone' where Li 3 PS 4 and Li 4 GeS 4 are formed, and the 'Product stage' where the desired glassy-ceramic Li 10 GeP 2 S 12 is formed after 520 min of milling. At room temperature, the as-milled sample achieved a high ionic conductivity of 1.07 × 10 −3 S cm −1 . It was determined via quantitative phase analyses (QPA) of transmission X-ray diffraction results that the as-milled Li 10 GeP 2 S 12 possessed a high degree of amorphization (44.4 wt %). To further improve the crystallinity and ionic conductivity of the Li 10 GeP 2 S 12 , heat treatment of the as-milled sample was carried out. The optimal heat-treated Li 10 GeP 2 S 12 is almost fully crystalline and possesses a room temperature ionic conductivity of 3.27 × 10 −3 S cm −1 , an over 200% increase compared to the glassy-ceramic Li 10 GeP 2 S 12 . These findings help provide previously lacking insights into the controllable preparation of Li 10 GeP 2 S 12 material.

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“…Ball milling studies on other oxide ceramics indicate that a small increase in unit cell volume can be attributed to increases in vacancy defects generated during the high energy processing. 40 Subsequent thermal treatments in oxygen atmospheres can be used to restore the lattice. 41 Figure 5 shows the TEM micrograph of the lab-synthesized alumina powder after ball milling for 270 min and contamination removal.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…At the smallest crystallite size, the volume increase of the unit cell is ∼0.5%. Ball milling studies on other oxide ceramics indicate that a small increase in unit cell volume can be attributed to increases in vacancy defects generated during the high energy processing . Subsequent thermal treatments in oxygen atmospheres can be used to restore the lattice …”

Section: Resultsmentioning

confidence: 99%

Reducing the Size of Nanocrystals below the Thermodynamic Size Limit

Drazin

Kazerooni

Gorzkowski

et al. 2017

Crystal Growth & Design

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In material systems with competing phase stabilities, simple growth techniques for nanocrystal synthesis are generally restricted to producing the thermodynamically lowest energy crystal structure. Alumina is one industrially and scientifically relevant example where the excess enthalpy of high specific surface area structures (i.e., nanocrystals) forces synthesized nanocrystals to adopt crystal structures that deviate from those observed in large crystals and have very different properties. Prior room temperature thermodynamic calculations determine that alumina nanocrystals smaller than 12 nm are either γ or amorphous, and numerous experimental works confirm the difficulty of producing α-alumina nanocrystals smaller than ∼15 nm. In this work, a direct and simple, high-energy processing route was developed in order to reduce as-grown ∼50 nm α-alumina starting crystallites down to sub-10 nm crystallites; below the room temperature thermodynamic crossover size limit. The nanocrystals were subsequently washed to remove WC-Co contamination on the nanocrystal surfaces incurred during the high-energy process. The smallest crystallite size of high-energy processed powder was 8.7 nm. High-resolution TEM establishes that the individual crystallites have different crystallographic orientations with nominal sphericity revealing a truly nanocrystalline powder. The developed processing route provides an industrial and scalable procedure that provides a new avenue for nanocrystalline α-alumina synthesis and, potentially, other metastable nanocrystals.

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Non-monotonic lattice parameter variation in ball-milled ceria

Cited by 14 publications

References 37 publications

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Li-Ion Conductivity of Single-Step Synthesized Glassy-Ceramic Li₁₀GeP₂S₁₂ and Post-heated Highly Crystalline Li₁₀GeP₂S₁₂

Reducing the Size of Nanocrystals below the Thermodynamic Size Limit

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Non-monotonic lattice parameter variation in ball-milled ceria

Cited by 14 publications

References 37 publications

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Boosting Piezo‐Catalytic Activity of KNN‐Based Materials with Phase Boundary and Defect Engineering

Li-Ion Conductivity of Single-Step Synthesized Glassy-Ceramic Li10GeP2S12 and Post-heated Highly Crystalline Li10GeP2S12

Reducing the Size of Nanocrystals below the Thermodynamic Size Limit

Contact Info

Product

Resources

About

Li-Ion Conductivity of Single-Step Synthesized Glassy-Ceramic Li₁₀GeP₂S₁₂ and Post-heated Highly Crystalline Li₁₀GeP₂S₁₂