Microstructure in the transition region and steady-state region of ice-templated sintered lithium titanate Li4Ti5O12 materials fabricated with and without sucrose

This study provides insights into the influence of sucrose (a water-soluble additive) on microstructure evolution in the transition region and steady-state region in ice-templated Li 4 Ti 5 O 12 materials. A scanning electron microscope was employed for the two-dimensional characterization of micros...

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Bibliographic Details
Published in:Journal of materials research 2021-09, Vol.36 (17), p.3519-3538
Main Authors: Parai, Rohan, Gundrati, Naga Bharath, Akurati, Sashanka, Koenig, Gary M., Ghosh, Dipankar
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Chemistry and Materials Science
Computed tomography
Inorganic Chemistry
Interface stability
Lithium
Materials Engineering
Materials research
Materials Science
Microstructure
Nanotechnology
Sintering (powder metallurgy)
Steady state
Sucrose
Supercooling
Thermal conductivity
Tortuosity
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Summary:This study provides insights into the influence of sucrose (a water-soluble additive) on microstructure evolution in the transition region and steady-state region in ice-templated Li 4 Ti 5 O 12 materials. A scanning electron microscope was employed for the two-dimensional characterization of microstructure in the transition region. Sucrose reduced the height of the transition region, caused an early alignment of ice lamellae toward temperature gradient direction, and resulted in a fine, dendritic microstructure. The overall microstructure development in the transition region was markedly different with and without sucrose. The differences were rationalized based on thermal conductivity, constitutional supercooling, and instability of the planar interface. Three-dimensional characterization of the steady-state region using X-ray computed tomography revealed that sucrose caused increased branching of the primary ice dendrites through tip splitting. A majority of the secondary dendrites turned into neighboring primary dendrites, enhancing pore path complexity. Diffusion simulations were performed to quantify pore tortuosity, which increased with sucrose content. Graphic abstract
ISSN:0884-2914
2044-5326
DOI:10.1557/s43578-021-00367-3