期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 44, 页码 10529-10537出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc02830f
关键词
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资金
- National Natural Science Foundation of China [21427802]
- Twelfth Five Year'' Project of Science and Technology Research in the Education Department of Jilin Province [2015-466]
- Natural Science Fund of Jilin Provincial Science & Technology Department [20160101326JC]
Reversible thermochromic inorganic materials change colour with temperature, which are used in temperature indicator devices, such as temperature sensors, laser marking and warning signals. In this paper, we report a series of thermochromic materials of rare-earth iron garnets Sm3-xCaxFe5O12 (x = 0, 0.1, 0.3, 0.5). All samples were prepared by a high temperature solid state reaction by repeated grinding and calcination of high purity Sm2O3, Fe2O3 and CaO. The sample structure and optical behaviour were characterized by powder X-ray diffraction (XRD), the Mossbauer spectrum, infrared (IR), Raman and UV-vis-NIR spectroscopy. All results showed the pure phase of Sm3-xCaxFe5O12 (x = 0, 0.1, 0.3, 0.5) with Ca2+ partially substituted Sm3+ at C sites. The Mossbauer spectrum indicates that Fe3+ shows mixed valence states in Ca2+ doped samples. Thermochromism of all Sm3-xCaxFe5O12 (x = 0, 0.1, 0.3, 0.5) samples showed the change in colour from green to brown and the introduction of Ca2+ ions shows gradual tunability of colour. Temperature-dependent XRD and UV-vis spectra indicated that a continuous structural evolution accompanied by Fe3+-O bond length stretching is the main reason for the thermochromic properties. Thus, this paper provides a family of new thermochromic materials for potential thermometric applications.
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