Samarium titanate (Sm2Ti2O7) materials for high-temperature sensor applications

Sensors International Pub Date : 2022-01-01 DOI:10.1016/j.sintl.2022.100200

P. Sivagnanapalani, P.K. Panda

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引用次数: 2

Abstract

Samarium titanate (Sm₂Ti₂O₇) is a perovskite layered structure (PLS) material with high Curie temperature (T_C ≥ 1247 °C). Sm₂Ti₂O₇ (STO) powders were synthesized by solid state reaction method by calcining the constituent powders at 1100 °C for 2 h. The average crystallite size of calcined STO powder was measured to be 61 nm. Circular discs of STO samples were sintered between the temperature range 1250–1450 °C with a soaking time of 2 h and sintered density was highest (>96.35% Th.) for the samples sintered at 1450 °C. The direct current electrical resistivity linearly decreased from 10¹³ to 10⁶ Ω.cm during its increase in temperature from 100 to 900 °C. The activation energy of the STO samples were 0.38 ± 0.01 eV (Ea₁) and 1.77 ± 0.01 eV (Ea₂) at temperature ranges 100 to 400 °C and 500 to 900 °C, respectively. Hence, samarium titanate is a promising sensor material for high-temperature applications.

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高温传感器用钛酸钐(Sm2Ti2O7)材料

钛酸钐(Sm2Ti2O7)是一种具有高居里温度(TC≥1247℃)的钙钛矿层状结构(PLS)材料。将Sm2Ti2O7 (STO)粉末在1100℃下煅烧2 h，采用固相反应法制备Sm2Ti2O7 (STO)粉末。煅烧后STO粉末的平均晶粒尺寸为61 nm。烧结温度在1250 ~ 1450℃之间，保温时间为2 h，烧结密度在1450℃时最高，达到96.35% Th。直流电阻率从1013线性下降到106 Ω。在温度从100°C升高到900°C的过程中。在100 ~ 400℃和500 ~ 900℃温度范围内，STO样品的活化能分别为0.38±0.01 eV (Ea1)和1.77±0.01 eV (Ea2)。因此，钛酸钐是一种很有前途的高温传感器材料。

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来源期刊

Sensors International

CiteScore

17.40

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0.00%

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