Jump to main content
Jump to site search
Access to RSC content Close the message box

Continue to access RSC content when you are not at your institution. Follow our step-by-step guide.



A description of the formation and growth processes of CaTiO$_{3}$ mesocrystals: A joint experimental and theoretical approach

Abstract

In this paper, we report on a combined experimental and theoretical study conducted in order to rationalize the formation and growth mechanism of CaTiO3 mesocrystals throughout the microwave-assisted hydrothermal synthesis at short times. The transformation process in which the initial nanoplates are converted to microcubes of CaTiO3 is investigated in detail. Field emission scanning electron microscopy images, photoluminescence emissions and Langevin dynamic simulations were carried out. We determined how the quenching rate induced by the microwave irradiation can be used to finely tune structural characteristics of the final CaTiO$_3$ nanoparticles, including size, shape and crystallinity, showing that the microcubes appear only within a temperature range of 130-200$^o$C. The theoretical and experimental results allow us to propose a mechanism involving three steps: i) a nucleation process of nanoplates below 10 min, ii) a self-assembly process of nanoplates to form microcube-shaped CaTiO3 under specific thermodynamic conditions, and finally, iii) the formation of well defined microcubes. The present results provide not only a deeper insight into the nucleation and growth processes but also help to find a relationship between morphology and the photoluminescence behavior throughout the microwave-assisted hydrothermal synthesis of target metal oxides. These findings shift the focus of the experimental and theoretical research onto the detailed study of the connectivity of TiO6 octahedra and CAO_${12}$ cube-octahedra as the constituent building blocks of the CaTiO3 lattice, paving the way for quantitative predictions of the events involved in the self-assembly processes of CaTiO$_3$ nanocrystals

Back to tab navigation

Article information


Submitted
17 Apr 2020
Accepted
24 Jun 2020
First published
24 Jun 2020

Mol. Syst. Des. Eng., 2020, Accepted Manuscript
Article type
Paper

A description of the formation and growth processes of CaTiO$_{3}$ mesocrystals: A joint experimental and theoretical approach

M. L. L. Moreira, J. R. Bordin, J. Andrés, J. A. Varela and E. Longo, Mol. Syst. Des. Eng., 2020, Accepted Manuscript , DOI: 10.1039/D0ME00043D

Social activity

Search articles by author

Spotlight

Advertisements