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The amazing properties of lanthanum strontium co-cobalt ferrite magnets

Views: 12     Author: Site Editor     Publish Time: 2022-09-29      Origin: Site

Lanthanum strontium cobalt ferrite (LSCF), also known as lanthanum strontium cobalt ferrite, is a specific ceramic oxide derived from lanthanum cobaltate of the ferrite group. It is a phase containing lanthanum oxide (III), strontium oxide, cobalt oxide and iron oxide, the molecular formula is LaxSR1-XCoyFE1-YO3, where 0.1≤ X ≤0.4, 0.2≤ Y ≤0.8. It is black and crystallizes in a twisted hexagonal perovskite structure. LSCF undergoes phase transition at different temperatures depending on its composition. The material is a hybrid ionic electron conductor with high electronic conductivity (200+S/cm) and good ionic conductivity (0.2S/cm).


It is usually nonstoichiometric and can be further reduced at high temperatures under low partial pressure of oxygen or in the presence of reducing agents such as carbon. Lanthanum strontium cobalt ferrite is being investigated as a cathode material for mesophilic solid oxide fuel cells and possibly as an anode for direct carbon fuel cells. Lanthanum strontium cobalt ferrite has also been investigated as a membrane material to separate oxygen from air for use in, for example, clean-burning power plants.


Lanthanum sr cobalt iron is a kind of perovskite composite oxides, has a unique crystal structure, especially after doping the formation of the crystal defect structure and performance, is applied or can be used in solid fuel cell, solid electrolyte, sensors, high temperature heating materials, solid resistor and replace precious metal REDOX catalyst, and many other areas, It has become a research hotspot in the fields of chemistry, physics and materials.


Lanthanum strontium cobalt ferrite basic performance

Appearance: Black powder

PSD(D50) : 25~35μm (adjustable)

Crystal phase structure: perovskite phase


Perovskite oxide fuel cell SOFC has the following advantages:


(1) All solid structure, there is no liquid electrolyte caused by corrosion and electrolyte loss and other problems;

(2) no need to use precious metal electrode, battery cost is greatly reduced;

(3) a wide range of fuel applications;

(4) The fuel can be reformed inside the battery. The doping in electrode material was used to improve the activity and optimize the charge and discharge performance of alkaline manganese battery.


Good results have been obtained by using manganese - containing perovskite oxide as cathode material in alkaline solution. Because the D electronic structure of element manganese is rapidly transferred between the trivalent and tetravalent oxides of manganese, it shows high electronic conductivity and good electrode rechargeability. The doped modified electrode material was obtained through the composite perovskite structure doped with Pb, Co, Ba, Ca, Sr and other elements. The incorporation of Pb will affect the bonding state of MN-O and the crystal water in MNO2 lattice, resulting in chemical shift of Mn2P3-2 energy level and increase of binding energy.


The N - O ionic property increases while the covalent property decreases. The charging and discharging mechanism of the modified electrode was tested, and the discharge capacity of the battery was increased by more than 40% after nano-doping. As a hybrid conductor material, LA1-XsrXFe1-YCoyo3 has excellent electronic and ionic conductive properties, and has good compatibility with the new generation of mesothermal solid oxide electrolytes such as LA0.9SR0.1Ca0.8Mg0.O3 and Ce0.9GD0.1O1.95. Therefore, LA1-XSRXFe1-YCoyo3 system material is a very promising medium temperature SOFC cathode material. 


Mather et al. prepared metal anode ceramic material Ni Srce0.9YB0.1O3-δ by nitrate and urea melt combustion method. The experimental results show that the addition of Co can reduce the sintering temperature and obtain high anode porosity, which is conducive to the adsorption of anode and electrolyte. The submicroporous particles on the anode are composed of nickel and perovskite particles.


However, the existing perovskite-type composite oxides have low ionic conductivity and exhibit electron or oxygen ion conductivity at high temperature. In the application research of fuel cell, the device can run stably at high temperature, but the efficiency or power of the device is low. When perovskite-type composite oxide is used as electrolyte, it must be used at a high temperature greater than 700℃. Therefore, the research of solid electrolyte and electrode materials with high ionic conductivity and wide temperature range is the main goal in the future. Due to the stability and mechanical strength of the existing matrix material MNceO3, it is still difficult to realize the practical application. Although the matrix material MnZRO3 has high stability and mechanical strength, the ion conductivity of the material is low, and the power of its fuel cell is difficult to meet the requirements.


A or b in perovskite structure after be replaced by other metal ions or partly replace synthetic unique structure and properties of compound oxide, thus forming the anion defects or different valence state of b ion, the special structure of functional materials have been found with the gas sensors, GMR, conductivity and catalytic activity and so on characteristics, involving electronics, machinery, chemical, aerospace, communications and home appliances and so on. 


For example, with its unique wine sensitive characteristics and strong oxygen sensitive characteristics, it can be used as electrode materials for wine sensitive sensors and oxygen sensors, and the gas sensitive elements made of high sensitivity, strong anti-interference, fast response speed, with good resistance value stability and related measurement accuracy; As the electrode material of oxygen sensor, it can be used to monitor the emission of automobile exhaust and detect the oxygen content in smelting. By optimizing the binding coefficient and strain conditions of two kinds of perovskite materials, the sonar sensor with excellent performance for naval ships can be made. In the field of catalysis, laboratory scale flue gas SO2 reduction catalyst has been reported, and is being vigorously studied and developed as a photodegradation catalyst and vehicle exhaust catalyst.


Nanometer materials, information technology and biotechnology are the three pillars of the 21st century social and economic development, perovskite composite oxides as a kind of important functional materials in nanometer field has a broad application prospect, further study on its synthesis, structure, and special purpose in the chemical industry, machinery industry and national defense has practical significance.


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