Microstructure and Optical Properties of Ti54.5Ni45.5 Nanocrystalline Thin Film

doi:10.1007/s40195-017-0606-3

Abstract

Abstract:

Nanocrystalline Ti_54.5Ni_45.5 thin film was prepared by magnetron sputtering followed by rapid thermal annealing. The film displayed martensite structure and (001) compound twin substructure, and the transformation temperatures M _s and A _s are 313 and 365 K, respectively. The reflectivity for the wavelength from 200 to 800 nm at 298 and 393 K was investigated, and the results showed that the optical reflectivity contrast between martensite and austensite at 780, 650, 514 and 405 nm was 105.64, 170.83, 112.22 and 149.92%, respectively, which were larger than those of other reported optical recording materials.

Key words: Ti-Ni thin films, Sputtering, Shape memory alloys, Optical properties, Microstructure

Xin Zhang, Jie-He Sui, Yong-Chao Lei, Wei Cai. Microstructure and Optical Properties of Ti_54.5Ni_45.5 Nanocrystalline Thin Film[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(12): 1231-1235.

Figures/Tables 5

Fig. 1 XRD pattern of annealed Ti54.5Ni45.5 alloy thin film at room temperature a and standard XRD pattern of martensite for Ti-Ni alloy b (M: martensite)

Fig. 2 TEM images of Ti54.5Ni45.5 alloy thin film and corresponding diffraction patterns: a bright field image; b enlarged image of Fig. 2a; c bright field image of (001) compound twined thermal martensite; d diffraction pattern of (001)M zone taken from Fig. 2c; e bright field image of (001) compound twined thermal martensite

Fig. 3 Electrical resistance-temperature curves of Ti54.5Ni45.5 alloy thin film

Fig. 4 Reflectivity spectrum a and reflectivity contrast b of Ti54.5Ni45.5 alloy thin film

Table 1 Reflectivity contrast of different optical recording medium at commonly used wavelengths

Material	Reflectivity contrast
Ge₂Sb₂Te₅ [23]	≤42
Ag₈In₁₄Sb₅₅Te₂₃ [24]	≤70
AgInTeSbGe [25]	≤65
Al _x GST [26]	≤30
Si:SbO _x [27]	≤36
Mo/Si bilayer [28]	25.8 (405 nm)
Metal(II) hydrazone complexes [29]	≤45
Our work	≥100

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