Preparation method of KSr2Nb5O15 transparent ferroelectric ceramic

A ferroelectric ceramic and transparent technology is applied in the preparation of transparent ferroelectric ceramics, KSr2Nb5O15 transparent ferroelectric ceramics and the field of preparation thereof, which can solve the problems of insufficient density, low optical transmittance, increase ceramic density, etc. The effect of low equipment requirements, high visible light transmittance and short preparation period

Active Publication Date: 2018-09-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The KSN ceramics obtained by the existing KSN preparation process have insufficient density and low optical transmittance
It has been reported that the highest optical transmittance of KSN ceramics in the visible light range is only 25%. For subsequent optical applications, the optical transmittance of KSN ceramics prepared by existing technologies is far from sufficient.
In the preparation process of the prior art, no attention was paid to the impact of particle si

Method used

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  • Preparation method of KSr2Nb5O15 transparent ferroelectric ceramic
  • Preparation method of KSr2Nb5O15 transparent ferroelectric ceramic
  • Preparation method of KSr2Nb5O15 transparent ferroelectric ceramic

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Embodiment 1

[0026] This embodiment is a KSr 2 Nb 5 o 15 The preparation method of transparent ferroelectric ceramics, the concrete process is:

[0027] Step 1, mixing ingredients. Rod-shaped KSr prepared by molten salt method 2 Nb 5 o 15 Microcrystalline powder as raw material, with Bi 2 o 3 The powder is a sintering aid, according to KSr 2 Nb 5 o 15 Microcrystalline powder: Bi 2 o 3 The weight ratio of powder = 1000:3 weighs the KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder; in the present embodiment, the KSr taken by weighing 2 Nb 5 o 15 The microcrystalline powder is 10g, and the Bi 2 o 3 The powder is 0.03g. The KSr 2 Nb 5 o 15 The morphology of the microcrystalline powder is rod-shaped; the rod-shaped KSr 2 Nb 5 o 15 The microcrystalline powder has a diameter of 1-3 μm and a length of 5-15 μm. The KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder mixing means to complete the mixing of ceramic powder and sintering aids.

[002...

Embodiment 2

[0036] This embodiment is a KSr 2 Nb 5 o 15 The preparation method of transparent ferroelectric ceramics, the concrete process is:

[0037] Step 1, mixing ingredients. Rod-shaped KSr prepared by molten salt method 2 Nb 5 o 15 Microcrystalline powder as raw material, with Bi 2 o 3 The powder is a sintering aid, according to KSr 2 Nb 5 o 15 Microcrystalline powder: Bi 2 o 3 The weight ratio of powder = 1000:6 weighs the KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder; in the present embodiment, the KSr taken by weighing 2 Nb 5 o 15 The microcrystalline powder is 10g, and the Bi 2 o 3 The powder is 0.06g. The KSr 2 Nb 5 o 15 The morphology of the microcrystalline powder is rod-shaped; the rod-shaped KSr 2 Nb 5 o 15 The microcrystalline powder has a diameter of 1-3 μm and a length of 5-15 μm. The KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder mixing means to complete the mixing of ceramic powder and sintering aids.

[003...

Embodiment 3

[0045] This embodiment is a KSr 2 Nb 5 o 15 The preparation method of transparent ferroelectric ceramics, the concrete process is:

[0046] Step 1, mixing ingredients. Rod-shaped KSr prepared by molten salt method 2 Nb 5 o 15 Microcrystalline powder as raw material, with Bi 2 o 3 The powder is a sintering aid, according to KSr 2 Nb 5 o 15 Microcrystalline powder: Bi 2 o 3 The weight ratio of powder = 1000:4 weighs the KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder; in the present embodiment, the KSr taken by weighing 2 Nb 5 o 15 The microcrystalline powder is 10g, and the Bi 2 o 3 The powder is 0.04g. The KSr 2 Nb 5 o 15 The morphology of the microcrystalline powder is rod-shaped; the rod-shaped KSr 2 Nb 5 o 15 The microcrystalline powder has a diameter of 1-3 μm and a length of 5-15 μm. The KSr 2 Nb 5 o 15 Microcrystalline powder and Bi 2 o 3 Powder mixing means to complete the mixing of ceramic powder and sintering aids.

[004...

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Abstract

The invention discloses a preparation method of KSr2Nb5O15 transparent ferroelectric ceramic. Through design of a ball milling technology, grain composition is achieved; through the optimization of arubber dicharging technology, a large number of pores are prevented from being formed in a ceramic blank in the rubber dicharging process; through sintering in an oxygen atmosphere, gas in the pores in the ceramic blank is compatible with a material system in the sintering process, so that the discharge of oxygen atoms is facilitated, and the porosity is reduced and the density of the ceramic is increased. The KSr2Nb5O15 transparent ceramic prepared by the preparation method provided by the invention has high density, low porosity and high visible light transmittance, and a technical basis isprovided for subsequent optical functional application of the system material; in addition, sintering in a pressureless atmosphere is adopted, a requirement on sintering equipment is low, a preparation cycle is short, later annealing treatment is not required, and economy, convenience and fastness are achieved.

Description

technical field [0001] The invention belongs to the technical field of transparent ceramic preparation, and relates to a preparation method of transparent ferroelectric ceramics, in particular to a KSr 2 Nb 5 o 15 Transparent ferroelectric ceramic and its preparation method. Background technique [0002] In recent years, potassium strontium niobate (chemical formula KSr 2 Nb 5 o 15 , referred to as KSN) has attracted extensive attention in the scientific and technological circles because of its ferroelectric, dielectric, electro-optic, thermoelectric, photocatalytic and other properties. Potassium strontium niobate has a typical tetragonal tungsten bronze structure. Among them, NbO 6 The octahedrons form a framework structure through common top connections, and are arranged in an orderly manner along the c-axis, enclosing three different lattice sites for cations to occupy. Because of its special crystal structure, it is easy to achieve a variety of cation doping to ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/64
CPCC04B35/495C04B35/622C04B35/62615C04B35/62695C04B35/64C04B2235/3201C04B2235/3213C04B2235/3298C04B2235/5436C04B2235/6562C04B2235/6567C04B2235/6585C04B2235/661C04B2235/77C04B2235/9653
Inventor 高峰曹舒尧许杰陈倩史芳军
Owner NORTHWESTERN POLYTECHNICAL UNIV
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