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A lead-free sodium niobate-based antiferroelectric ceramic with high saturation polarization and low remnant polarization and its preparation method

A technology of lead-free sodium niobate and lead sodium niobate, which is applied to the parts of fixed capacitors, the dielectric of fixed capacitors, etc., to achieve the effect of high flipping electric field and low remanent polarization

Active Publication Date: 2021-10-01
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still insufficient researches on material systems related to antiferroelectricity, as well as related structural mechanisms, electrical properties, and practical applications. In particular, there are almost no systems with good double electric hysteresis loop characteristics at room temperature.

Method used

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  • A lead-free sodium niobate-based antiferroelectric ceramic with high saturation polarization and low remnant polarization and its preparation method
  • A lead-free sodium niobate-based antiferroelectric ceramic with high saturation polarization and low remnant polarization and its preparation method
  • A lead-free sodium niobate-based antiferroelectric ceramic with high saturation polarization and low remnant polarization and its preparation method

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preparation example Construction

[0031] The preparation method of the sodium niobate-based antiferroelectric ceramic material of the present disclosure can be prepared by a solid phase reaction process, for example, it can include steps such as batching, mixing, briquetting, synthesis, crushing, fine grinding, molding, plastic discharge, and sintering . Hereinafter, the preparation method of the sodium niobate-based antiferroelectric ceramic material will be exemplified.

[0032] Firstly, ceramic powders were prepared by solid phase method. Specifically, the sodium source, niobium source, calcium source, and tin source are expressed as (1-x)NaNbO 3 -xCaSnO 3 The stoichiometric ratio is mixed evenly, and the NNCS ceramic powder is synthesized.

[0033] Sodium source can use sodium bicarbonate (NaHCO 3 ), sodium carbonate (Na 2 CO 3 ). Niobium source can use niobium pentoxide (Nb 2 o 5 ). Calcium source can use calcium carbonate (CaCO 3 ). Tin source can use tin dioxide (SnO 2 ).

[0034] The raw ...

Embodiment 1

[0046] The composition of the material is 0.99NaNbO 3 -0.01CaSnO 3

[0047] (1) with NaHCO 3 , Nb 2 o 5 , CaCO 3 and SnO 2 Powder as raw material, according to 0.99NaNbO 3 -0.01CaSnO 3 Stoichiometric ratio preparation, mixing by wet ball milling, briquetting after drying, and synthesis to obtain NNCS ceramic powder according to the mass ratio of raw materials: balls: alcohol = 1:8:1, mixing for 24 hours, after drying, passing 40-mesh sieve, pressed into large pieces under a pressure of 200MPa, raised to 1100°C at a heating rate of 2°C / min, and held for 4 hours to synthesize 0.99NaNbO 3 -0.01CaSnO 3 Powder;

[0048] (2) Grinding the powder obtained in step (1), passing through a 40-mesh sieve, and then finely grinding by wet ball milling, finely grinding for 48 hours according to the mass ratio of raw material: ball: deionized water=1:8:0.7 , and dry the finely ground powder. Then add 6wt.% PVA binder, granulate, briquette, age for 24 hours, pass through a 40-mesh s...

Embodiment 2

[0054] The composition of the material is 0.98NaNbO 3 -0.02CaSnO 3

[0055] Repeat the preparation method of Example 1 according to the above chemical formula composition;

[0056] (1) with NaHCO 3 , Nb 2 o 5 , CaCO 3 and SnO 2 Powder as raw material, according to 0.98NaNbO 3 -0.02CaSnO 3 Stoichiometric ratio preparation, mixing by wet ball milling, briquetting after drying, and synthesis to obtain NNCS ceramic powder according to the mass ratio of raw materials: balls: alcohol = 1:8:1, mixing for 24 hours, after drying, passing 40-mesh sieve, pressed into large pieces under a pressure of 200MPa, raised to 1100°C at a heating rate of 2°C / min, and held for 4 hours to synthesize 0.98NaNbO 3 -0.02CaSnO 3 Powder;

[0057] (2) Grinding the powder obtained in step (1), passing through a 40-mesh sieve, and then finely grinding by wet ball milling, finely grinding for 48 hours according to the mass ratio of raw material: ball: deionized water=1:8:0.7 , and dry the finely g...

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Abstract

The invention relates to a lead-free sodium niobate-based antiferroelectric ceramic with high saturation polarization and low remanent polarization and a preparation method thereof. The chemical composition of the lead-free sodium niobate-based antiferroelectric ceramic material is: ( 1−x)NaNbO 3 ‑xCaSnO 3 , where 0<x≤0.06.

Description

technical field [0001] The invention relates to a lead-free antiferroelectric ceramic material, in particular to a lead-free sodium niobate-based antiferroelectric ceramic with good double hysteresis loop characteristics at room temperature and a preparation method thereof, belonging to the field of functional ceramics. Background technique [0002] Pulse power technology refers to the electrophysical technology that slowly inputs the energy of smaller power into the energy storage device for a long time, then compresses and converts it, and releases it to the load with a very high power density in a very short time. It is widely used in national defense, high-tech, civil and other fields, and can be used to manufacture some key components of pulse power supply, medical equipment, electron accelerator, dust removal and environmental protection, engine, national defense weapon, ignition device, etc. [0003] An important part of a pulsed power source is the energy storage ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88H01G4/12
Inventor 王根水叶嘉明陈学锋董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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