Laser preparation method of lanthanum molybdate based oxygen ion conductor

An ion conductor, lanthanum molybdate technology, which is applied in the field of laser preparation of lanthanum molybdate-based oxygen ion conductors, can solve the problems of increased conductivity, complex process, and long cycle, and achieve high density, simple process, and low cost. Effect

Inactive Publication Date: 2012-07-18
ZHENGZHOU UNIV
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Problems solved by technology

[0003] The object of the present invention is to provide a laser preparation method of lanthanum molybdate-based oxygen ion conductors, which can overcome the defects of the existing methods such as long cycle, high energy consumption, complicated process and low yield, and the samples prepared by this method are relatively There is a way to prepare samples with significantly higher conductivity

Method used

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  • Laser preparation method of lanthanum molybdate based oxygen ion conductor
  • Laser preparation method of lanthanum molybdate based oxygen ion conductor
  • Laser preparation method of lanthanum molybdate based oxygen ion conductor

Examples

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Embodiment 1

[0026] La 2 Mo 0.8 W 1.2 o 9 The preparation steps are as follows:

[0027] 1) before weighing La 2 o 3 Put it in a high-temperature furnace and burn it at 800 °C for 2 hours to remove the hydroxide and carbonate components.

[0028] 2) will La 2 o 3 、MoO 3 、WO 3 Mixed according to the molar ratio of 1:0.8:1.2, then mixed with absolute ethanol, sealed in an agate jar equipped with agate balls, ball milled for 4 h with a high-energy ball mill, and the ball mill speed was 220 rpm, then the sample was taken out and placed in a dry box Dry for 5 h in a drying oven at 150 °C. The dried mixed powder was compacted under a pressure of 40 MPa for a dwell time of 60 s to obtain a green body with a diameter of 14 mm and a thickness of 2 mm.

[0029] 3) The sample body was placed in a crucible, covered with a lid, and placed in a high-temperature tube furnace. The high-temperature furnace was set to heat up to a calcination temperature of 590 °C at a rate of 5 °C / min, and pre-...

Embodiment 2

[0034] The laser power used is 700 W, and the irradiation time for each surface is 60 s. Others are the same as in Example 1. The conductivity of the prepared samples in the range of 500-800 ℃ was tested by AC impedance spectroscopy in air atmosphere and the phase composition was analyzed by X-ray diffraction. Corresponding in the XRD spectrum peak position and embodiment 1, illustrate also can prepare pure La under this condition 2 Mo 0.8 W 1.2 o 9 , a cubic structure at room temperature. The relative density of the sample is 99.2%, and the electrical conductivity is shown in Table 1.

Embodiment 3

[0036] La 2 o 3 、MoO 3 、WO 3 Proportioning according to the molar ratio of 1:1.0:1.0, other are the same as embodiment 2. Corresponding in the XRD spectrum peak position and embodiment 1, illustrate that pure La can be prepared under this condition 2 Mo 1.0 W 1.0 o 9 , a cubic structure at room temperature. The relative density of the sample is 99.3%, and the electrical conductivity is shown in Table 1.

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Abstract

The invention belongs to the technical field of preparing a solid oxide oxygen ion conductor and in particular relates to a laser preparation method of a lanthanum molybdate based oxygen ion conductor. The preparation method comprises the following steps of: adopting La2O3, MoO3 and WO3 powder as the raw materials; proportioning according to the mole ratio of La2Mo(2-x)WxO9 with the value of x between 0.2 and 1.2; and mixing evenly and compacting the raw materials to obtain blanks, presintering and subjecting the blanks to irradiation of CO2 laser beams for full reaction. The preparation method provided by the invention is simple in process, low in cost, short in time consumption, low in energy consumption and good in process repeatability and the obtained sample of the lanthanum molybdate based oxygen ion conductor has high density and high oxygen ion conductivity.

Description

technical field [0001] The invention belongs to the technical field of preparation of solid oxide oxygen ion conductors, in particular to a laser preparation method of lanthanum molybdate-based oxygen ion conductors. Background technique [0002] Solid electrolytes with high oxygen ion conductivity have important application value and prospects in the fields of solid oxide fuel cells, oxygen sensors, oxygen permeable membranes, and solid-state ionic devices. La 2 Mo 2 o 9 It is a new type of oxygen ion conductor first reported by P. Lacorre's research group in 2000 (Nature 404 (2000) 856.), and its oxygen ion conductivity is about 0.06S / cm at 800°C, but La 2 Mo 2 o 9 The material undergoes a phase transition from high-temperature cubic to low-temperature monoclinic at around 580°C. Along with the phase transition, the electrical conductivity decreases by two orders of magnitude, and the thermal expansion coefficient of the material also undergoes a sudden change, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00
Inventor 晁明举余菊美李德川梁二军李明玉
Owner ZHENGZHOU UNIV
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