Carbon dioxide gas sensor
A gas sensor, carbon dioxide technology, applied in the structural details of gas analyzers, analysis of gas mixtures, lanthanum oxide/lanthanum hydroxide and other directions, can solve the problems of unreported pseudo-binary systems, etc. Performance Effects of Chemical Resistance
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no. 1 Embodiment approach
[0051] [First Embodiment: Gas Sensor]
[0052] According to the first embodiment, the present invention relates to CO 2 gas sensor. figure 1 It is a schematic cross-sectional view showing an example of the gas sensor according to the first aspect of the present embodiment. refer to figure 1 , the gas sensor 1 mainly includes a gas sensing layer 1 , an electrode 2 , an insulating substrate 3 , and a heater layer 4 . It should be noted, figure 1 The configuration of the gas sensor is schematically shown, and the size and thickness of each part are not critical, and the relative position, size relationship, etc. are not limited to those shown in the drawings.
[0053] The insulating substrate 3 is only required to ensure electrical insulation between the heater layer 4 and the electrode 2 , and for example, a silicon substrate with an oxide film or an alumina substrate can be used, but is not limited thereto. The heater layer 4 is provided on one main surface of the insul...
no. 2 Embodiment approach
[0078] [Second Embodiment: Manufacturing method of rare earth metal oxycarbonate]
[0079] According to the second embodiment, the present invention relates to a method for producing a rare earth metal oxycarbonate. ln 2 o 2 CO 3 The production method of the shown rare earth metal oxycarbonate (Ln as defined above) comprises: heating rare earth metal carboxylate or rare earth metal carbonate or its hydrate in gas atmosphere at 425~575 ℃ for 2~80 hours, or a process of 5 to 80 hours.
[0080] In the production method of the present embodiment, a rare earth metal carboxylate or a rare earth metal carbonate or a hydrate thereof can be used as a starting material. Rare earth metals constituting rare earth metal carboxylates can use the target substance Ln 2 o 2 CO 3 The one corresponding to Ln of the rare earth metal oxycarbonate shown can be selected from the previously defined Ln. As a specific rare earth metal carboxylate, Ln 2 [C 2 o 4 ] 3 Oxalate or Ln as indicate...
no. 3 Embodiment approach
[0082] [Third embodiment: Selective production method of polymorphic form of lanthanum dioxycarbonate]
[0083] In the manufacture of rare earth metal oxycarbonates, the rare earth metal is especially lanthanum (La), and the starting material is La 2 [C 2 o 4 ] 3 ·nH 2 Lanthanum oxalate hydrate represented by O or Ln[CH 3 COO] 3 ·nH 2 When the acetate hydrate represented by O, different polymorphs can be selectively produced. That is, the monoclinic crystal, the hexagonal crystal, and their mixtures can be respectively produced by changing the conditions of temperature and time in the range of the second embodiment regarding the starting material and production conditions.
[0084] Lanthanum dioxycarbonate composed of hexagonal crystals can be obtained by adding La 2 [C 2 o 4 ] 3 ·nH 2 O or Ln[CH 3 COO] 3 ·nH 2 O is obtained by heating at 475-575°C for 60-80 hours. Lanthanum dioxycarbonate composed of monoclinic crystals can be obtained by adding La 2 [C 2 o ...
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