A solid solution formed of tungsten bronze and perovskite structure oxide and its preparation method

A technology of perovskite structure and solid solution, applied in the field of solid solution, can solve the problem of no solid solution of heterogeneous materials, and achieve the effects of excellent room temperature energy storage properties, changing microscopic morphology, and simple preparation method.

Active Publication Date: 2021-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the fact that the existing relaxor ferroelectric solid solutions are all based on the same kind of materials, but not based on the solid solution of heterogeneous materials, the present invention provides a new solid solution based on the formation of heterogeneous materials tungsten bronze structure and perovskite structure oxide and its preparation method

Method used

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  • A solid solution formed of tungsten bronze and perovskite structure oxide and its preparation method
  • A solid solution formed of tungsten bronze and perovskite structure oxide and its preparation method
  • A solid solution formed of tungsten bronze and perovskite structure oxide and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 5.8287 grams of SBN powder and 0.1713 grams of BNBT (x=0.05) powder, add an appropriate amount of alcohol to the mixture of the two powders, and then ball mill for 24 hours to mix the two powders evenly. After the obtained powder is dried, an appropriate amount of powder is pressed into a sheet with a diameter of about 10 mm and a thickness of about 2-3 mm with a pressure of 15 MPa. Put appropriate amount of corresponding powder into Al 2 o 3 Crucible, then put the slice into it, and cover the slice with the corresponding powder, and finally use another crucible to buckle upside down on the first crucible, so that the slice is in a sealed state. Put the crucible sealed with the flakes into a muffle furnace and raise the temperature, and the heating rate from room temperature to the sintering temperature (1200° C.) is controlled at 3° C. / min. After sintering at 1300 °C for 3 h, the temperature was lowered to 600 °C at a cooling rate of 3 °C / min, and then cooled n...

Embodiment 2

[0023] Weigh 5.6496 g of SBN powder and 0.3504 g of BNBT (x=0.10) powder, add an appropriate amount of alcohol to the mixture of the two powders, and then ball mill for 24 hours to mix the two powders evenly. After the obtained powder is dried, an appropriate amount of powder is pressed into a sheet with a diameter of about 10 mm and a thickness of about 2-3 mm with a pressure of 15 MPa. Put appropriate amount of corresponding powder into Al 2 o 3 Crucible, then put the slice into it, and cover the slice with the corresponding powder, and finally use another crucible to buckle upside down on the first crucible, so that the slice is in a sealed state. Put the crucible sealed with the flakes into a muffle furnace and raise the temperature, and the heating rate from room temperature to the sintering temperature (1250° C.) is controlled at 3° C. / min. After sintering at 1220°C for 3h, the temperature was lowered to 600°C at a rate of 3°C / min, and then cooled naturally. (1-x)SBN-...

Embodiment 3

[0025] Weigh 5.4620 g of SBN powder and 0.5380 g of BNBT (x=0.15) powder, add an appropriate amount of alcohol to the mixture of the two powders, and then ball mill for 24 hours to mix the two powders evenly. After the obtained powder is dried, an appropriate amount of powder is pressed into a sheet with a diameter of about 10 mm and a thickness of about 2-3 mm with a pressure of 15 MPa. Put appropriate amount of corresponding powder into Al 2 o 3 Crucible, then put the slice into it, and cover the slice with the corresponding powder, and finally use another crucible to buckle upside down on the first crucible, so that the slice is in a sealed state. Put the crucible sealed with the flakes into a muffle furnace and raise the temperature, and the heating rate from room temperature to the sintering temperature (1200° C.) is controlled at 3° C. / min. After sintering at 1200°C for 3h, the temperature was lowered to 600°C at a cooling rate of 3°C / min, and then cooled naturally. (...

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Abstract

The invention discloses a tungsten bronze structure Sr based on heterogeneous material 0.75 Ba 0.25 Nb 2 o 6 (SBN) with perovskite structure 0.94Bi 0.5 Na 0.5 TiO 3 ‑0.06BaTiO 3 (BNBT) formed solid solution and its preparation method. Mix single-phase SBN powder and BNBT powder evenly, and sinter at high temperature for 3 hours to obtain (1‑x)SBN‑xBNBT solid solution. Bi in BNBT 3+ 、Na + 、Ba 2+ and Ti 4+ Diffused into the SBN tungsten bronze structure at high temperature to occupy the lattice position to form a solid solution, this solid solution ceramic has a large grain anisotropy, a wide range of adjustable electrical properties and excellent room temperature energy storage efficiency. Compared with the traditional solid solution based on similar materials, the present invention not only provides a solid solution based on heterogeneous materials, but also provides a new idea for developing a new type of solid solution.

Description

technical field [0001] The invention relates to a solid solution formed of tungsten bronze structure and perovskite structure oxide and a preparation method. Background technique [0002] Relaxor ferroelectric oxides are not only the basis for studying the source of relaxation phenomena, but also widely used in high-tech fields such as information, medical, transportation, and biology due to their rich dielectric, ferroelectric, and piezoelectric properties. [0003] In recent years, with the enhancement of people's awareness of environmental protection and the needs of sustainable social development, environmentally friendly lead-free relaxor ferroelectrics have become more and more research hotspots, among which Sr 1-x Ba x Nb 2 o 6 Represented by tungsten bronze structure oxide and Bi 0.5 Na 0.5 TiO 3 The perovskite structure oxides represented by the most attention. Generally speaking, to optimize the electrical properties of relaxor ferroelectrics, one of the mos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622
CPCC04B35/495C04B35/622C04B2235/3201C04B2235/3213C04B2235/3215C04B2235/3234C04B2235/3236C04B2235/3298C04B2235/6562C04B2235/6567
Inventor 张善涛袁芯李玲陶纯玮张骥王瑞雪
Owner NANJING UNIV
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