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A barium-calcium co-doped substitution la 2 nio 4 Giant dielectric ceramic and its preparation method

A co-doping and giant dielectric technology is applied in the field of barium-calcium co-doping substitution of La2NiO4 giant dielectric ceramics and its preparation, which can solve the problem of poor frequency stability of dielectric constant, narrow temperature range of dielectric constant, and high dielectric constant. Constant and other issues, to achieve the effect of good temperature stability, easy preparation, high dielectric constant

Active Publication Date: 2020-05-05
ANHUI CHENXIN VICTOR IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the dielectric ceramics that are relatively mature and applied are traditional ferroelectric materials (such as barium titanate, strontium titanate, etc.), but the disadvantage of such materials is that they need to be tested at a low temperature to show high dielectric properties. electric constant
For example xNd 2 o 3 -SrTiO 3 Ceramics will exhibit giant dielectric properties, but their dielectric constants are generally low in the range of 20-340 °C, and their dielectric constants are lower than 500 in the temperature range of 20-160 °C, and their high-temperature end dielectric constants do not exceed 16000. And the temperature range of its dielectric constant is very narrow, and the frequency stability of its dielectric constant is poor in the frequency range of 0.04-300kHz

Method used

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  • A barium-calcium co-doped substitution la <sub>2</sub> nio <sub>4</sub> Giant dielectric ceramic and its preparation method
  • A barium-calcium co-doped substitution la <sub>2</sub> nio <sub>4</sub> Giant dielectric ceramic and its preparation method
  • A barium-calcium co-doped substitution la <sub>2</sub> nio <sub>4</sub> Giant dielectric ceramic and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] (1) Preparation of mixed powder: Take 9.286g of lanthanum oxide, 0.296g of barium carbonate, 0.15g of calcium carbonate, and 2.241g of nickel oxide in a ball mill jar, add 10ml (0.45wt%PVB+0.45wt% oleic acid) and 5ml Dehydrated ethanol is placed in a planetary ball mill for ball milling for 24 hours, and after drying, it is passed through a 150-mesh sieve to obtain a mixed powder;

[0072] (2) Preparation of pre-fired La 1.9 (Ba,Ca) 0.1 NiO 4 powder: put the mixed powder in step (1) in an alumina crucible, then place the aluminum crucible in a high-temperature tube furnace and pre-fire it at 1100°C for 3 hours to obtain pre-fired La 1.9 (Ba,Ca) 0.1 NiO 4 Powder;

[0073] (3) Secondary ball milling: put the pre-burned powder in a ball milling tank, add 15ml of absolute ethanol, put it in a planetary ball mill for 18 hours, and pass through a 150-mesh sieve after drying to obtain La 1.9 (Ba,Ca) 0.1 NiO 4 Powder;

[0074] (4) Granulation: to 2g La 1.9 (Ba,Ca) 0....

Embodiment 2

[0079] (1) Preparation of mixed powder: Take 8.797g of lanthanum oxide, 0.592g of barium carbonate, 0.3g of calcium carbonate, and 2.241g of nickel oxide in a ball mill jar, add 10ml (0.45wt% PVB+0.45wt% oleic acid) and 5ml Dehydrated ethanol is placed in a planetary ball mill for ball milling for 24 hours, and after drying, it is passed through a 150-mesh sieve to obtain a mixed powder;

[0080] (2) Preparation of pre-fired La 1.8 (Ba,Ca) 0.2 NiO 4 powder: put the mixed powder in step (1) in an alumina crucible, then place the aluminum crucible in a high-temperature tube furnace and pre-fire it at 1100°C for 3 hours to obtain pre-fired La 1.8 (Ba,Ca) 0.2 NiO4 Powder;

[0081] (3) Secondary ball milling: put the pre-burned powder in a ball milling tank, add 15ml of absolute ethanol, put it in a planetary ball mill for 18 hours, and pass through a 150-mesh sieve after drying to obtain La 1.8 (Ba,Ca) 0.2 NiO 4 Powder;

[0082] (4) Granulation: to 2gLa 1.8 (Ba,Ca) 0.2 N...

Embodiment 3

[0087] (1) Preparation of mixed powder: Take 8.308g of lanthanum oxide, 0.888g of barium carbonate, 0.45g of calcium carbonate, and 2.241g of nickel oxide in a ball mill jar, add 10ml (0.45wt%PVB+0.45wt% oleic acid) and 5ml Dehydrated ethanol is placed in a planetary ball mill for ball milling for 24 hours, and after drying, it is passed through a 150-mesh sieve to obtain a mixed powder;

[0088] (2) Preparation of pre-fired La 1.7 (Ba,Ca) 0.3 NiO 4 powder: put the mixed powder in step (1) in an alumina crucible, then place the aluminum crucible in a high-temperature tube furnace and pre-fire it at 1100°C for 3 hours to obtain pre-fired La 1.7 (Ba,Ca) 0.3 NiO 4 Powder;

[0089] (3) Secondary ball milling: put the pre-burned powder in a ball milling tank, add 15ml of absolute ethanol, put it in a planetary ball mill for 18 hours, and pass through a 150-mesh sieve after drying to obtain La 1.7 (Ba,Ca) 0.3 NiO 4 Powder;

[0090] (4) Granulation: to 2g La 1.7 (Ba,Ca) 0....

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Abstract

The invention discloses a barium and calcium co-doped substituted La2NiO4 gigantic dielectric ceramic and a preparation method thereof. The chemical formula of the barium and calcium co-doped substituted La2NiO4 gigantic dielectric ceramic is La2-x(Ba, Ca)xNiO4, wherein x is greater than 0 and is not greater than 0.5. The preparation method is characterized in that a solid phase sintering method is carried out. The method is simple to operate, high in repeatability, and high in yield; additional atmosphere supporting sintering is avoided; the XRD derivation result shows that the doped samplesare all of K2NiF4 structures. Compared with La2NiO4, the barium and calcium co-doped substituted La2NiO4 gigantic dielectric ceramic is obvious high in dielectric coefficient. Additionally, differentBa and Ca doping ratios are adopted, so that ceramic samples with different dielectric performances can obtained.

Description

technical field [0001] The invention belongs to the field of dielectric information functions, in particular to a barium-calcium co-doped instead of La 2 NiO 4 Giant dielectric ceramic and its preparation method. Background technique [0002] In recent years, the electronic industry has developed rapidly with each passing day. The integration and miniaturization development trend of electronic information technology has promoted the miniaturization, miniaturization, and integration of electronic components, as well as the development in the direction of high reliability and low cost. In the field of ceramic capacitors, miniaturization, high capacity and excellent temperature stability have become an inevitable development trend. Multilayer ceramic capacitors (MLCC) can well meet the requirements of small volume and large capacity. Moreover, with the development of ceramic preparation technology, MLCC is also developing in the direction of more layers and thinner dielectri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/626C04B35/634C04B35/638
CPCC04B35/50C04B35/62645C04B35/62695C04B35/63416C04B35/638C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/94C04B2235/96
Inventor 郭旺黄集权江亚彬薛锤兵李国京邓种华兰海陈剑刘著光
Owner ANHUI CHENXIN VICTOR IND TECH CO LTD
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