Effect of Synthesis Routes on Microstructure of Nanocrystalline Cerium Oxide Powder

Abstract

<p align="justify"> <span style="font-family:Verdana;">The effect of different processing routes on the microstructure of nanocrystalline ceria powder has been investigated. The nanocrystalline ceria is produced by solid state high energy ball milling (HEBM) and liquid state solution combus</span><span style="font-family:Verdana;">tion synthesis (SCS) method. The liquid state route consists of a high temperature combustion reaction to form ceria from an aqueous solution of cerium ammonium nitrate (CAN) as an oxidizer and citric acid (CA) plus glycine (G) as mixed fuels. The powders have been characterized using techniques of X-ray diffraction (XRD), particle size analysis, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The microstructural characteriza</span><span style="font-family:Verdana;">tions show that the particle size distribution of the ball milled ceria powder is much wider than that of ceria produced by the SCS. The scanning electron micrographs show that the ball milled ceria powders are compact and dense structure while SCS ceria powders are scattered and porous.</span><span></span> </p> <p> <span></span> </p

Brazeability, Microstructure, and Joint Characteristics of ZrO2/Ti-6Al-4V Brazed by Ag-Cu-Ti Filler Reinforced with Cerium Oxide Nanoparticles

“…is results in high reactivity of the particles at nanoscale level. e morphology of the CeO 2 powder particles (Figure 4(b)) is like loose spongy type which is a typical morphology obtained for combustion synthesized powder [27]. is type of structure is already observed in the past by several researchers.…”

“…e peak broadening indicates the nanocrystallinity of the powder with an increased lattice strain. e average crystallite size (D) of the powder particles is given by the Scherer equation [27]:…”

“…CeO 2 Powder. Cerium oxide nanopowder was prepared by using the high-temperature solution combustion method using ceric ammonium nitrate, citric acid, and glycine [27]. All the chemicals were of reagent grade supplied by Sigma Aldrich, USA.…”

High-Entropy Alloys for Micro- and Nanojoining Applications

“…Secondly, it is an environmentally benign and safe technique as compared to chemical routes (solution precipitation, plating, chemical vapor deposition) where toxic waste disposal and drainage costs are added up [17][18][19]. In addition, high-energy ball milling is a simple and effective way to produce novel nanostructured materials, homogeneous chemical distribution, and extension of solid solubility and widens the scope of HEA [34][35][36][37][38][39][40]. Further densification of milled powders by heat treatment, hotpressing, cold isostatic pressing, or spark plasma sintering (SPS) technique gives the stable bulk HEA.…”