Preparation and Electrical Properties of High Entropy La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 Perovskite Ceramics Powder

doi:10.15541/jim20200380

Abstract

Abstract:

High entropy La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃ perovskite ceramics powder were prepared using coprecipitation method combined with calcination process, and synthesis temperature of the high entropy perovskite ceramics was significantly reduced. The phases and morphology of the ceramics powder were characterized by different methods. The results show that when the calcination temperature is 800 ℃, perovskite structure with a small amount of second phase was formed in the ceramics powder. When the calcination temperature is 1000 ℃, pure perovskite structure is formed in the La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃high entropy ceramics powder. Three electrode system was used to test the electrical properties of the working electrode made from the La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃high entropy ceramics powder, including cyclic voltammetry (CV) test and constant current charge-discharge (GCD) test. At the current density of 1 A/g, specific capacity of the working electrode reaches 154.8 F/g, while the current density increased to 10 A/g, the electrode material can still maintain 47%(73 F/g) of the initial specific capacity. All results indicate that high entropy La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃ perovskite ceramics have good rate properties.

Key words: high entropy ceramics, copercipitation, phasestability, specific capacity

CLC Number:

TB332

GUO Meng, ZHANG Fengnian, MIAO Yang, LIU Yufeng, YU Jun, GAO Feng. Preparation and Electrical Properties of High Entropy La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃ Perovskite Ceramics Powder[J]. Journal of Inorganic Materials, 2021, 36(4): 431-435.

Figures/Tables 7

Table 1 Molar ratios of each element component of the six samples

Sample	La	Co	Cr	Fe	Mn	Ni
La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃	5	1	1	1	1	1
La(Cr_0.25Fe_0.25Mn_0.25Ni_0.25)O₃ La(Co_0.25Fe_0.25Mn_0.25Ni_0.25)O₃ La(Co_0.25Cr_0.25Mn_0.25Ni_0.25)O₃ La(Co_0.25Cr_0.25Fe_0.25Ni_0.25)O₃ La(Co_0.25Cr_0.25Fe_0.25Mn_0.25)O₃	4 4 4 4 4	No 1 1 1 1	1 No 1 1 1	1 1 No 1 1	1 1 1 No 1	1 1 1 1 No

Fig. 1 XRD patterns of the La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 ceramic powders calcined at different temperatures

Fig. 2 XRD patterns of the quaternary systems powders calcined at 1000 ℃

Fig. 3 Height and width of sample varied with calcination temperature

Fig. 4 SEM image of sample La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 calcined at 800 ℃ (a), SEM image (b) and corresponding EDS element mapping (c-g) of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 calcined at 1000 ℃

Fig. 5 CV curves of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 electrode

Fig. 6 GCD curves of La(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3 electrode

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Preparation and Electrical Properties of High Entropy La(Co_0.2Cr_0.2Fe_0.2Mn_0.2Ni_0.2)O₃ Perovskite Ceramics Powder

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