scholarly journals Effects of Mechanical Milling with Ag Powder on Thermoelectric Properties of NaxCo2O4 Polycrystal Synthesized through Citric Acid Complex Process

2007 ◽  
Vol 55 (2) ◽  
pp. 90-95 ◽  
Author(s):  
Mikio Ito ◽  
Junji Sumiyoshi
Keyword(s):  
Citric Acid ◽  
Thermoelectric Properties ◽  
Mechanical Milling ◽  
Acid Complex ◽  
Complex Process

The honeycomb-like Eu3+, Fe3+ doping bismuth molybdate photocatalyst with enhanced performance prepared by a citric acid complex process

2017 ◽  
Vol 192 ◽  
pp. 96-100 ◽  
Author(s):  
Min Wang ◽  
Pengyao Guo ◽  
Guangjun Yang ◽  
Tianyu Chai ◽  
Tong Zhu
Keyword(s):  
Citric Acid ◽  
Bismuth Molybdate ◽  
Acid Complex ◽  
Complex Process

Preparation of Delafossite CuYO2 by Metal-citric Acid Complex Decomposition Method

2009 ◽  
Vol 1166 ◽  
Author(s):  
Keishi Nishio ◽  
Tomomi Okada ◽  
Naoto Kikuchi ◽  
Satoshi Mikusu ◽  
Tsutomu Iida ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Citric Acid ◽  
Single Phase ◽  
Raw Materials ◽  
Chelating Agent ◽  
Amorphous Powder ◽  
Heat Treating ◽  
Acid Complex ◽  
Synthesis Conditions ◽  
Starting Solution

AbstractDelafossite CuYO2 and Ca doped CuYO2 were prepared by thermal decomposition of a metal-citric acid complex. The starting solution consisted of Cu acetate, Y acetate and Ca acetate as the raw materials. Citric acid was used as the chelating agent, and acetic acid and distilled water were mixed as a solvent. The starting solutions were heated at 723 K for 5 h after drying at 353 K. The obtained powders were amorphous and single phase of orthorhombic Cu2Y2O5 was obtained by heat-treated the amorphous powder at a temperature range between 1073 and 1373 K for 3 h in air. Furthermore, Heat-treating the obtained orthorhombic Cu2Y2O5 at above 1373 K in air caused it to decompose into Y2O3, CuO and Cu2O. On the other hand, the sample powder prepared from a starting solution without citric acid, i.e., single phase of orthorhombic Cu2Y2O5 could not be obtained under the same synthesis conditions as that for a solution with citric acid. We were able to obtain delafossite CuYO2 and Ca doped CuYO2 from orthorhombic Cu2Y2O5 under a low O2 pressure atmosphere at above 1223 K. The obtained delafossite CuYO2 composed hexagonal and rhombohedral phases. The color of the CuYO2 powder was light brown and that of Ca-doped CuYO2 was light green. Diffraction peaks in the XRD pattern were slightly shifted by doping Ca for CuYO2, and these peaks shifted toward to a high diffraction angle with an increasing amount of doped Ca. From these results, we concluded that Ca doped delafossite CuYO2 could be obtained by thermal decomposition of a metal-citric acid complex.

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