Preparation method of KNbO3 nano solid solution with adjustable optical band gap

An optical band gap and solid solution technology, applied in the field of preparation of KNbO3 nano solid solution, can solve the problems of poor controllability and high reaction temperature, and achieve the effect of low sintering temperature, low sintering temperature and complete crystallization of samples

Inactive Publication Date: 2014-11-26
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-temperature solid-state reaction preparation method of the Rappe group has poor controllability, relatively high reaction temperature, and requires the use of expensive platinum crucibles

Method used

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  • Preparation method of KNbO3 nano solid solution with adjustable optical band gap
  • Preparation method of KNbO3 nano solid solution with adjustable optical band gap
  • Preparation method of KNbO3 nano solid solution with adjustable optical band gap

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1 (corresponding to x=0.1):

[0035] Weigh 4.143g of citric acid monohydrate and 0.031g of basic nickel carbonate into 30ml of deionized water, and dissolve completely to form solution A; weigh 2.581g of niobium oxalate and add 30ml of deionized water to form a solution after completely dissolving B: Add solution B slowly to solution A drop by drop and stir thoroughly, then weigh 0.415g of anhydrous potassium carbonate and 0.099g of barium carbonate and add directly to the mixed solution of solution A and solution B, fully react and stir for 1h to form a colorless solution For transparent solution C, add 2.435 g of ethylene glycol at the end, stir well and then add 40 ml of deionized water to form 100 ml of mixed solution D. Put the mixed solution D in a constant temperature oil bath at 110°C to evaporate and promote the esterification of citric acid and ethylene glycol, and finally obtain a viscous gel, which is placed in a vacuum drying oven at 180°C for pr...

Embodiment 2

[0036] Embodiment 2 (corresponding to x=0.4):

[0037] Weigh 7.07g of citric acid monohydrate and 0.126g of basic nickel carbonate into 50ml of deionized water, and dissolve completely to form solution A; weigh 2.173g of niobium oxalate and add 30ml of deionized water to form a solution after completely dissolving B: Add solution B slowly to solution A drop by drop and stir thoroughly, then weigh 0.311g of anhydrous potassium carbonate and 0.395g of barium carbonate and add directly to the mixed solution of solution A and solution B, fully react and stir for 1h to form a colorless solution Transparent solution C; finally add 4.154g of ethylene glycol, stir well and add 20ml of deionized water to form 100ml of mixed solution D. Put the mixed solution D in a constant temperature oil bath at 120°C to heat and evaporate and promote the esterification of citric acid and ethylene glycol, and finally obtain a viscous gel, which is placed in a vacuum drying oven at 200°C for processin...

Embodiment 3

[0039] Embodiment 3 (corresponding to x=0.5):

[0040] Weigh 8.042g of citric acid monohydrate and 0.157g of basic nickel carbonate into 60ml of deionized water, and dissolve completely to form solution A; weigh 2.038g of niobium oxalate and add 30ml of deionized water to form a solution after completely dissolving B; Add solution B slowly to solution A drop by drop and stir thoroughly, then weigh 0.276g of anhydrous potassium carbonate and 0.493g of barium carbonate and add directly to the mixed solution of solution A and solution B, fully react and stir for 2 hours to form a colorless Transparent solution C; finally add 4.727g of ethylene glycol, stir well and add 10ml of deionized water to form 100ml of mixed solution D. Put the mixed solution D in a constant temperature oil bath at 130°C to heat and evaporate and promote the esterification of citric acid and ethylene glycol, and finally obtain a viscous gel, which is placed in a vacuum drying oven at 220°C for 3 hours A d...

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Abstract

The invention discloses a preparation method of KNbO3 nano solid solution with adjustable optical band gap. The preparation method is as follows: adding citric acid monohydrate into deionized water for completely dissolving, then adding basic nickel carbonate, heating and stirring to form a transparent solution A; adding niobium oxalates into the deionized water for completely dissolving to form a solution B; slowly adding dropwise the solution B into the solution A, fully stirring, successively dissolving anhydrous potassium carbonate and barium carbonate into a mixed solution of the solution A and the solution B for full reaction and stirring to form a transparent solution C; finally adding ethylene glycol, and fully stirring to form a solution D; heating the D solution for evaporation and promotion of citric acid and ethylene glycol esterification, drying to form a dark yellow solid precursor; grinding the precursor, and calcining in air atmosphere to eventually obtain the nano solid solution with the chemical formula of [KNbO3] 1-x [BaNi1 / 2Nb1 / 2O3-Delta] x. The product exhibits better photocatalytic effect in visible region.

Description

technical field [0001] The invention relates to the field of ferroelectric semiconductor materials with photovoltaic effect, in particular to a kind of KNbO with adjustable optical bandgap 3 Nano solid solution (chemical formula is [KNbO 3 ] 1‐X [BaNi 1 / 2 Nb 1 / 2 o 3‐δ ] X , wherein x=0.1,0.2,0.3,0.4,0.5) preparation method. Background technique [0002] Recently, the photovoltaic effect of ferroelectric materials has received great attention. Since ferroelectric materials have spontaneous polarization, they can effectively separate photogenerated electron-hole pairs, making it possible to obtain high-efficiency photovoltaic cells using ferroelectric materials. Ferroelectric materials are mostly oxides, which have good mechanical, chemical and thermal stability in a wide range. At the same time, the cost of preparing ferroelectric materials is also low. Generally, ferroelectric materials with a perovskite structure have relatively large semiconductor band gaps, and bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622
Inventor 张弜张家敏李余铭陈龙胜陈熹
Owner SOUTH CHINA UNIV OF TECH
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