Abstract
The precursor samarium nickelate or samarium-neodimium nickelate films were fabricated by a spin coating method using Sm-Ni or Nd-Sm-Ni aqueous solutions, and SmNiO3 and Nd0.5Sm0.5NiO3 films were obtained by heat-treatment of the precursor films at 750 °C in oxygen atmosphere. The resulting SmNiO3 and Nd0.5Sm0.5NiO3 films showed an electrical transition with the transition temperatures of 124.0 and 32.5 °C, respectively. Both of the films showed optical thermochromic properties at the above mentioned transition temperatures.
Highlights
IntroductionLots of energy-efficient window materials have been investigated, including electrochromic materials (Granqvist, 2007; Yang et al, 2012), thermochromic materials (Takahashi, Hibino, & Kudo, 1996; Miyazaki & Yasui, 2006; Granqvist, 2007) and photochromic materials (Armistead & Stookey, 1964; Scarminio, Lourenco, & Gorenstein, 1997; Granqvist, 2007)
Though a gradient of the resistivity of the films changed beyond the transition temperature, the resistivity of both of the films increased with increase of temperature
The calculated transition temperature of the SN and NSN films were 124.0 and 32.5 °C, and the value of SN was close to the reported value, and the value of NSN was slightly higher than the reported value (Nikulin et al, 2004)
Summary
Lots of energy-efficient window materials have been investigated, including electrochromic materials (Granqvist, 2007; Yang et al, 2012), thermochromic materials (Takahashi, Hibino, & Kudo, 1996; Miyazaki & Yasui, 2006; Granqvist, 2007) and photochromic materials (Armistead & Stookey, 1964; Scarminio, Lourenco, & Gorenstein, 1997; Granqvist, 2007). VO2 has been widely investigated for application of thermochromic materials because of its metal-insulator transition property, and the transition temperature can be controlled close to room temperature by the other element addition. The other materials such as SmNiO3 assume to be applied for a thermochromic window since SmNiO3 undergoes a metal-insulator transition (Lacorre et al, 1991; Pérez-Cacho et al, 1999; Nikulin et al, 2004; Girardot et al, 2008). We evaluated the transition temperature by measuring a temperature dependence of electrical resistivity, and observed the thermochromic property of the transition temperature controlled films
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