Transition metal element-doped bismuth calcium niobate ceramic material and preparation method thereof

A transition metal element, bismuth-calcium niobate technology, applied in the field of lead-free piezoelectric materials, can solve the problems of unsuitability for large-scale industrial production, poor piezoelectric performance of bismuth-calcium niobate ceramics, and high cost of plasma sintering. The effect of advancing application progress, improving piezoelectric performance, and good high-temperature stability

Inactive Publication Date: 2011-01-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the piezoelectric performance of this undoped calcium bismuth niobate ceramic is poor, and its d 33 Only 6pC / N, there is still a certain distance from practical application
Haixue Yan et al. textured bismuth calcium niobate ceramics by plasma sintering, making d 33 Increased to 19pC / N [Haixue Yan, Hongtao Zhang, Rick Ubic, Michael JReece, Jing Liu, Zhijian Shen, Zhen Zhang. A lead-Free High-Curie-Piont Ferroelectric Ceramic CaBi2NbO9. ADVANVED MATERIALS, 2005, 17, 1261-1265. ], but the cost of plasma sintering is high, the process is complicated and it is not suitable for large-scale industrial production

Method used

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  • Transition metal element-doped bismuth calcium niobate ceramic material and preparation method thereof
  • Transition metal element-doped bismuth calcium niobate ceramic material and preparation method thereof
  • Transition metal element-doped bismuth calcium niobate ceramic material and preparation method thereof

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Embodiment 1

[0033] The preparation conforms to the general chemical formula Ca 1-x Fe x Bi 2 Nb 2 o 9 , and Fe-doped calcium bismuth niobate ceramics when x=0.05.

[0034] The analytically pure powder raw material: 0.100g Fe 2 o 3 , 2.377 g CaCO 3 , 11.882gBi 2 o 3 and 6.645gNb2 o 5 According to the ordinary ceramic preparation process, the ingredients are mixed, and then the raw materials are mixed with alcohol, ball milled for 24 hours, pre-fired at 900 ° C for 2 hours, secondary ball milled for 24 hours, dried, ground in a mortar, pressed into tablets, plastic ejected at 550 ° C, After sintering at 1200°C for 4 hours, Fe-doped bismuth calcium bismuth niobate layered structure lead-free piezoelectric ceramic material was obtained. Grind the obtained ceramic sample to a thin slice with a thickness of 0.4mm, and cover the upper and lower surfaces of the thin slice with Pt electrodes, and polarize it in 200°C silicone oil at a voltage of 10KV / mm-20KY / mm for 10 minutes to test its...

Embodiment 2

[0038] The preparation conforms to the general chemical formula Ga 1-x mn x Bi 2 Nb 2 o 9 , and Mn-doped calcium bismuth niobate ceramics when x=0.05.

[0039] The analytically pure powder raw material: 0.144g MnCO 3 , 2.377 g CaCO 3 , 11.882gBi 2 o 3 and 6.645gNb 2 o 5 According to the ordinary ceramic preparation process, the ingredients are mixed, and then the raw materials are mixed with alcohol, ball milled for 24 hours, pre-fired at 900 ° C for 2 hours, secondary ball milled for 24 hours, dried, ground in a mortar, pressed into tablets, plastic ejected at 550 ° C, After sintering at 1200°C for 4 hours, the Mn-doped bismuth calcium bismuth niobate layered structure lead-free piezoelectric ceramic material was obtained. Grind the obtained ceramic sample into a thin slice with a thickness of 0.4mm, and cover the upper and lower surfaces of the thin slice with Pt electrodes, and polarize it in 200°C silicone oil at a voltage of 10KV / mm-20KV / mm for 10 minutes to tes...

Embodiment 3

[0043] The preparation conforms to the general chemical formula Ca 1-x co x Bi 2 Nb 2 o 9 , and Co-doped calcium bismuth niobate ceramics when x=0.05.

[0044] Analytical pure powder raw material: 0.104g Co 2 o 3 , 2.377 g CaCO 3 , 11.882gBi 2 o 3 and 6.645gNb 2 o 5 According to the ordinary ceramic preparation process, the ingredients are mixed, and then the raw materials are mixed with alcohol, ball milled for 24 hours, pre-fired at 900 ° C for 2 hours, secondary ball milled for 24 hours, dried, ground in a mortar, pressed into tablets, plastic ejected at 550 ° C, After sintering at 1200°C for 4 hours, a Co-doped bismuth calcium bismuth niobate layered structure lead-free piezoelectric ceramic material was obtained. Grind the obtained ceramic sample into a thin slice with a thickness of 0.4mm, and cover the upper and lower surfaces of the thin slice with Pt electrodes, and polarize it in 200°C silicone oil at a voltage of 10KV / mm-20KV / mm for 10 minutes to test its...

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Abstract

The invention belongs to the field of lead-free piezoelectric materials and particularly relates to a transition metal element-doped bismuth calcium niobate ceramic material and a preparation method thereof. The chemical components of the transition metal element-doped bismuth calcium niobate ceramic material conform to the chemical general formula: Cal-xAxBi2Nb2O9, wherein A is selected from transition metal element Fe, Mn or Co; and x is not less than 0.01 and not greater than 0.2. The preparation of the transition metal element-doped bismuth calcium niobate ceramic has the advantages of low cost and simple process and is suitable for large-batch industrial production. The piezoelectric performance of the transition metal element-doped bismuth calcium niobate ceramic is much higher than that of the undoped bismuth calcium niobate ceramic, and the transition metal element-doped bismuth calcium niobate ceramic can be widely applied to high-temperature fields such as aerospace and steelmaking.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric materials, and in particular relates to a calcium bismuth niobate ceramic material doped with transition metal elements and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are widely used in the fields of industrial control, environmental monitoring, communication, information system and medical equipment as sensors, brakes and frequency converters. At present, the widely used piezoelectric materials are mainly PZT (PbZrO) with a perovskite structure. 3 -PbTiO 3 ) and PT (PbTiO 3 )Material. [0003] With people's increasing awareness of environmental protection, many countries and regions have become more stringent on the control of lead content in electronic devices, and have proposed a lead-free schedule, which requires the development of alternatives to PZT (PbZrO 3 -PbTiO 3 ) and PT (PbTiO 3 ) lead-free piezoelectric ceramic material. Existing PZ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622
Inventor 沈波陈寰贝翟继卫
Owner TONGJI UNIV
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