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首页> 外文期刊>Sensors Journal, IEEE >Morphological and Humidity Sensing Investigations on Niobium, Neodymium, and Lanthanum Oxides
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Morphological and Humidity Sensing Investigations on Niobium, Neodymium, and Lanthanum Oxides

机译：铌，钕和镧氧化物的形貌和湿度传感研究

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This paper reports a comparative study of moisture sensing properties of niobium penta oxide, neodymium oxide, and lanthanum oxides. Pellets of these materials were made by using hydraulic pressing machine (M.B. Instruments, New Delhi, India) at a pressure of 616 MPa. These pellets were used as sensing elements and thermally annealed at temperatures 200 $^{circ}{hbox{C}}$ and 400 $^{circ}{hbox{C}}$ successively. After each step of annealing, the sensing element was put within a conventionally designed conductivity holder and exposed to humidity inside a controlled humidity chamber. Variations in resistance with the relative humidity were recorded for each sensing elements made of ${hbox{Nb}}_{2}{hbox{O}}_{5}$ , ${hbox{Nd}}_{2}{hbox{O}}_{3}$ , and ${hbox{La}}_{2}{hbox{O}}_{3}$ , respectively. Sensitivities of samples were compared at different annealing temperatures. Maximum values of sensitivities and linear response of sensors were obtained for samples annealed at 400 $^{circ}{hbox{C}}$. Lanthanum oxide revealed the highest sensitivity 20 ${hbox{M}}Omega/%{hbox{RH}}$ in comparison to other samples. Morphological and X-ray diffraction studies of the samples were performed. Results were found reproducible within $pm$5% error. No ageing effect was observed during three months.
机译：本文对氧化铌五氧化二钕，氧化镧和氧化镧的湿敏特性进行了比较研究。这些材料的粒料通过使用液压机（M.B.Instruments，印度新德里）在616MPa的压力下制得。这些颗粒用作感测元件，并在温度200℃和400℃下连续进行热退火。在每个退火步骤之后，将传感元件放入常规设计的电导率支架中，并暴露在受控湿度室内的湿度下。记录由$ {hbox {Nb}} _ {2} {hbox {O}} _ {5} $，$ {hbox {Nd}} _ {2} {制成的每个感应元件的电阻随相对湿度的变化hbox {O}} _ {3} $和$ {hbox {La}} _ {2} {hbox {O}} _ {3} $。比较了样品在不同退火温度下的敏感性。对于在400℃退火的样品，获得了传感器的灵敏度和线性响应的最大值。与其他样品相比，氧化镧显示出最高的灵敏度20 $ {hbox {M}} Omega /％{hbox {RH}} $。进行了样品的形态学和X射线衍射研究。发现结果可重复，误差在$ pm $ 5％之内。在三个月内未观察到老化作用。

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