Manganese-doped BNT-BA lead-free ferroelectric ceramic material and preparation method thereof,

A technology of BNT-BA, ferroelectric ceramics, applied in the field of functional materials, can solve the problem of reduced polarization strength, and achieve the effect of excellent comprehensive electrical properties

Active Publication Date: 2017-12-19
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

But the depolarization temperature T of (1-x)BNT-xBA d Decreases with the increase of BA content, such as x=0.08, T d It is about 80°C, and the remnant polarization is significantly reduced (Applied Physics Letters, 106, 092903, (2015); patent CN104402429A)

Method used

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  • Manganese-doped BNT-BA lead-free ferroelectric ceramic material and preparation method thereof,
  • Manganese-doped BNT-BA lead-free ferroelectric ceramic material and preparation method thereof,
  • Manganese-doped BNT-BA lead-free ferroelectric ceramic material and preparation method thereof,

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Embodiment 1: the composition of material is 0.96Bi 0.5 Na 0.5 (Ti 0.997 mn 0.003 )O 3 -0.04BiAlO 3

[0040] By Bi 2 o 3 , NaHCO 3 、TiO 2 、Al 2 o 3 , MnCO 3 Powder as raw material, according to 0.96Bi 0.5 Na 0.5 (Ti 1-x mn x )O 3 -0.04BiAlO 3 The stoichiometric ratio is prepared, mixed by wet ball milling, and mixed for 24 hours according to the mass ratio of raw materials: balls: alcohol = 1:2:0.8, so that the components are mixed evenly. After drying, pass through a 40-mesh sieve, press into large pieces under a pressure of 5MPa, raise the temperature to 850°C at a rate not higher than 2°C / min, keep it warm for 2 hours, and synthesize 0.96Bi 0.5 Na 0.5 (Ti 0.997 mn 0.003 )O 3 -0.04BiAlO 3 of ceramic powder.

[0041] The ceramic powder in step (1) is ground and passed through a 40-mesh sieve. Then mix according to the wet ball milling method, finely grind for 24 hours according to the mass ratio of raw material:ball:alcohol=1:2:0.6, and dry the...

Embodiment 2

[0047] Embodiment 2: the composition of material is 0.96Bi 0.5 Na 0.5 (Ti 0.993 mn 0.007 )O 3 -0.04BiAlO 3

[0048] Repeat the preparation method of Example 1 by the above-mentioned formula.

[0049] The hysteresis loop was tested at room temperature for the ceramic material of this example, and the results are shown in Table 1.

[0050] The ceramic material of the present embodiment is carried out the measurement of electric hysteresis loop under different temperatures, and the results are shown in figure 2 , it can be seen that the hysteresis loop of the material at 160°C exhibits typical ferroelectric properties. As the temperature continues to rise, the FE-AFE phase transition occurs at 175°C, and the hysteresis loop appears a waist phenomenon. image 3 It is the variation of the remanent polarization intensity obtained from the temperature-variable hysteresis loop in Example 2 with temperature. It can be seen that the Pr of the material can reach 30 μC / cm at 160 °...

Embodiment 3

[0052] Embodiment 3: the composition of material is 0.96Bi 0.5 Na 0.5 (Ti 0.980 mn 0.010 )O 3 -0.04BiAlO 3 i.e. x=1.0%

[0053] Repeat the preparation method of Example 1 by the above-mentioned formula.

[0054] The ceramic material of this comparative example is carried out the test of hysteresis loop under room temperature, and the results are shown in Table 1 and Figure 5 . It can be seen that the remnant polarization (P r ) is 38μC / cm 2 .

[0055] The main test results of embodiment 1, embodiment 2, embodiment 3, comparative example 1 have been listed respectively in table 1;

[0056] Table 1 Remanent polarization strength and test conditions of ceramic materials at room temperature

[0057]

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Abstract

The present invention relates to a manganese-doped BNT-BA lead-free ferroelectric ceramic material and a preparation method thereof, wherein the chemical composition of the manganese-doped BNT-BA lead-free ferroelectric ceramic material is 0.96Bi0.5Na0.5(Ti1-xMnx)O3-0.04BiAlO3, and x is more than or equal to 0.1% and is less than or equal to 1.0%. According to the present invention, the prepared manganese-doped BNT-BA binary ceramic has excellent comprehensive electrical properties and is expected to be applied in the technical field of high-power pulses.

Description

technical field [0001] The invention relates to a lead-free ferroelectric ceramic material with high residual polarization strength and high depolarization temperature, belonging to the field of functional materials. Background technique [0002] Some ferroelectric ceramic materials can undergo a ferroelectric-antiferroelectric (FE-AFE) phase transition under the action of an external field, and instantly release bound charges to generate high voltage or high current, which can be used as a high-power pulse power supply. Pb(Zr 0.95 Ti 0.05 )O 3 (referred to as PZT95 / 5) ceramics have the characteristics of high remnant polarization, FE-AFE phase transition and high phase transition temperature, and are ideal materials for high-power pulse power supply applications. As people pay more and more attention to environmental protection and sustainable development, following the European Union's RoSH ("Restriction on the use of certain hazardous components in electrical and elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622
CPCC04B35/475C04B35/622C04B2235/3201C04B2235/3222C04B2235/3267C04B2235/3298
Inventor 董显林彭萍聂恒昌王根水曹菲
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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