Visualizing the Internal Nanocrystallinity of Calcite Due to Nonclassical Crystallization by 3D Coherent X-Ray Diffraction Imaging

Suzana, Ana F. ; Lee, Sang Soo ; Calvo-Almazán, Irene (Universidad de Zaragoza) ; Cha, Wonsuk ; Harder, Ross ; Fenter, Paul

Resumen: The internal crystallinity of calcite is investigated for samples synthesized using two approaches: precipitation from solution and the ammonium carbonate diffusion method. Scanning electron microscopy (SEM) analyses reveal that the calcite products precipitated using both approaches have a well‐defined rhombohedron shape, consistent with the euhedral crystal habit of the mineral. The internal structure of these calcite crystals is characterized using Bragg coherent diffraction imaging (BCDI) to determine the 3D electron density and the atomic displacement field. BCDI reconstructions for crystals synthesized using the ammonium carbonate diffusion approach have the expected euhedral shape, with internal strain fields and few internal defects. In contrast, the crystals synthesized by precipitation from solution have very complex external shapes and defective internal structures, presenting null electron density regions and pronounced displacement field distributions. These heterogeneities are interpreted as multiple crystalline domains, created by a nonclassical crystallization mechanism, where smaller nanoparticles coalescence into the final euhedral particles. The combined use of SEM, X‐ray diffraction (XRD), and BCDI allows for structurally differentiating calcite crystals grown with different approaches, opening new opportunities to understand how grain boundaries and internal defects alter calcite reactivity.

Idioma: Inglés

DOI: 10.1002/adma.202310672

Año: 2024

Publicado en: Advanced materials (2024), 11 pp.
ISSN: 0935-9648

Factor impacto JCR: 26.8 (2024)

Categ. JCR: CHEMISTRY, PHYSICAL rank: 5 / 185 = 0.027 (2024) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 10 / 460 = 0.022 (2024) - Q1 - T1
Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 4 / 147 = 0.027 (2024) - Q1 - T1
Categ. JCR: PHYSICS, CONDENSED MATTER rank: 3 / 79 = 0.038 (2024) - Q1 - T1
Categ. JCR: CHEMISTRY, MULTIDISCIPLINARY rank: 6 / 239 = 0.025 (2024) - Q1 - T1
Categ. JCR: PHYSICS, APPLIED rank: 6 / 187 = 0.032 (2024) - Q1 - T1

Factor impacto SCIMAGO: 8.851 - Materials Science (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q1) - Mechanics of Materials (Q1) - Mechanical Engineering (Q1)

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)