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In this paper, the morphological and optical properties of LTO/TaOx composite structure films and electrochromic properties of “ITO/NiOx/LTO/TaOx/WOx/ITO” electrochromic devices (ECDs) based on LTO/TaOx composite structure films are reported. The composite films are deposited on the ITO substrate by reactive magnetron sputtering. The results of XRD, SEM, and AFM show that LTO film is amorphous and the performance of films prepared by sputtering power of 100 W for 5 h is the best. The optical transmittance of the multilayer structure is tested using an ultraviolet-visible spectrum and the refractive index dispersion is calculated using the relationship between the peaks in the spectrum based on equal inclination interference theory. Optical transmittance and refractive index dispersion are changed with the increase of magnetron sputtering power. Electrochromic tests show that all-solid-state ECDs based on composite films have 13 s coloring and 14 s fading response time, and the average optical modulation amplitude is 58%. [ABSTRACT FROM AUTHOR]

To reduce the production cost of Bi-2223 superconducting tapes, Bi-2223/Ag/Ni tapes were fabricated by the powder-in-tube process. The effect of heat treatment on the microstructure and critical current of the Bi-2223/Ag/Ni tapes were studied. The phase compositions of the samples were characterized using XRD. The microstructure was observed using SEM. Experimental results indicate that higher temperature is more conducive to the formation of Bi-2223 phase at an atmosphere of 8.5% O. After the two-step heat treatment, the critical current of samples is about 67.5 A. [ABSTRACT FROM AUTHOR]