Synthesis and Characterization of Ba_0.96Sr_0.04Zr_0.04Y_0.005Ti_0.955O_2.9975Nano-powders via Polyacrylamide-Gel Method

Abstract

Pure tetragonal phase Ba 0.96 Sr 0.04 Zr 0.04 Y 0.005 Ti 0.955 O 2.9975 nano-powders were synthesized via a simple, fast and low cost method: polyacrylamide gel (PAG) method.The effects of processing parameters on the polymerization reaction and the sizes of as-prepared powder were investigated. The results reveal that the critical value of monomer / cross-linking agent ratio is 4.5:1 for the tightest network structure and the smallest average particle size of nano-powder correspondingly due to the smallest grid of gel. The monomer/cross-linking agent ratio and the concentration of cross-linking agent have significant influence on the gel quality and particle. In the investigation range we have probed into, the nano-dispersed BSZYT powders is obtained. The average native grain size of as-prepared powder is ∼27 and ∼45 nm after calcined at 900 • C and 1200 • C, respectively.

High-Voltage LiNi0.5Mn1.5O4-δSpinel Material Synthesized by Microwave-Assisted Thermo-Polymerization: Some Insights into the Microwave-Enhancing Physico-Chemistry

“…Synthesis of pristine and microwave-treated LiMn 1.5 Ni 0.5 O 4-δ samples.-The pristine and microwave-irradiated LiMn 1.5 Ni 0.5 O 4-δ powders were synthesized by modified thermo-polymerization method [15][16][17][18] (herein referred to as LMNO and LMNOmic, respectively). Firstly, stoichiometric amounts of lithium acetate (2.93 g of LiCH 3 COO · 2H 2 O, 5% excess), nickel acetate (3.4 g of Ni(CH 3 COO) 2 · 4H 2 O) and manganese acetate (10.06 g of Mn(CH 3 COO) 2 · 4H 2 O) were dissolved in a 100 ml size beaker using 10 ml deionized pure water (with a resistivity of ρ = 18.2 M ) and the solution heated to 80…”