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A kind of hydrothermal method to prepare flower-like hierarchical structure nalati 2 o 6 Methods

A hydrothermal method, flower-like technology, applied in chemical instruments and methods, inorganic chemistry, nanotechnology, etc., can solve the problems of no reports, etc., and achieve the effect of simple preparation method, simple operation process and high product purity

Active Publication Date: 2018-02-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hierarchical NaLaTi 2 o 6 As a multi-level structure material with complex structure and special morphology, it has potential application prospects, but about the multi-level structure of NaLaTi 2 o 6 The preparation method has not been reported yet

Method used

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  • A kind of hydrothermal method to prepare flower-like hierarchical structure nalati <sub>2</sub> o <sub>6</sub> Methods
  • A kind of hydrothermal method to prepare flower-like hierarchical structure nalati <sub>2</sub> o <sub>6</sub> Methods

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Lanthanum nitrate (La(NO 3 ) 3 2H 2 O) Dissolved in deionized water, formulated as La 3+ Solution A with a concentration of 0.15mol / L, titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in deionized water to prepare Ti 4+ The concentration of solution B is 0.3mol / L;

[0028] 2) According to the molar ratio of lanthanum and titanium as 1:2, mix solution A and solution B, stir for 20 minutes to obtain solution C, add NaOH solution with a concentration of 2.0mol / L dropwise in solution C, and then set the solution at room temperature Stir for 20min to obtain the reaction precursor solution D; wherein, the molar ratio of Na to La is 1:1;

[0029] 3) Transfer the reaction precursor solution D into a reaction kettle lined with polytetrafluoroethylene, the filling degree of the reaction kettle is 40%, then seal the reaction kettle, place it in a hydrothermal reactor, and select a hydrothermal temperature of 160 ℃, the water heating time is 12h;

[0030] 4) After the react...

Embodiment 2

[0034] 1) Lanthanum nitrate (La(NO 3 ) 3 2H 2 O) Dissolved in deionized water, formulated as La 3+ The concentration of solution A is 0.1mol / L, titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in deionized water to prepare Ti 4+ The concentration of solution B is 0.2mol / L;

[0035]2) According to the molar ratio of lanthanum and titanium as 1:2, mix solution A and solution B, stir evenly to obtain solution C, add NaOH solution with a concentration of 1.5mol / L dropwise in solution C, and then at room temperature Stir for 20min to obtain the reaction precursor solution D; wherein, the molar ratio of Na to La is 1:1;

[0036] 3) Transfer the reaction precursor solution D into a reaction kettle lined with polytetrafluoroethylene, the filling degree of the reaction kettle is 50%, then seal the reaction kettle, place it in a hydrothermal reactor, and select a hydrothermal temperature of 160 ℃, the water heating time is 10h;

[0037] 4) After the reaction is completed, the react...

Embodiment 3

[0039] 1) Lanthanum nitrate (La(NO 3 ) 3 2H 2 O) Dissolved in deionized water, formulated as La 3+ Solution A with a concentration of 0.075mol / L, titanium sulfate (Ti(SO 4 ) 2 ) was dissolved in deionized water to prepare Ti 4+ The concentration of solution B is 0.15mol / L;

[0040] 2) According to the molar ratio of lanthanum and titanium as 1:2, mix solution A and solution B, stir evenly to obtain solution C, add NaOH solution with a concentration of 1.5mol / L dropwise in solution C, and then at room temperature Stir for 20min to obtain the reaction precursor solution D; wherein, the molar ratio of Na to La is 1:1;

[0041] 3) Transfer the reaction precursor solution D into a reaction kettle lined with polytetrafluoroethylene, the filling degree of the reaction kettle is 45%, then seal the reaction kettle, place it in a hydrothermal reactor, and select a hydrothermal temperature of 180 ℃, the water heating time is 8h;

[0042] 4) After the reaction is finished, the rea...

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Abstract

The invention provides a method for preparing NaLaTi2O6 with a flower-shaped multilevel structure by use of a hydrothermal method. The method comprises the following steps of: dissolving lanthanum salt in deionized water so as to prepare a solution A with La<3+> concentration of 0.05-0.15mol / L, and dissolving titanium salt in deionized water so as to prepare a solution B with Ti<4+> concentration of 0.1-0.3mol / L; mixing the solution A with the solution B, then stirring the mixture uniformly, adding a NaOH solution, and then stirring uniformly at a room temperature so as to obtain a reaction precursor solution D; and transferring the reaction precursor solution D into a reaction kettle with polytetrafluoroethylene serving as a liner, then sealing the reaction kettle, and performing thermal reaction at a temperature of 160-200 DEG C for 6-12 hours. According to the method, water is utilized as a solvent, any template agent is not added, and a one-step hydrothermal method is adopted to synthesize NaLaTi2O6 powder with flower-shaped multilevel structure microtopography. The method provided by the invention is simple in operation process, low in reaction temperature, high in product purity and suitable for large-scale production and preparation.

Description

technical field [0001] The invention relates to a method for preparing NaLaTi 2 o 6 The method, specifically relates to a kind of utilizing hydrothermal process to prepare flower-shaped multi-level structure NaLaTi 2 o 6 Methods. Background technique [0002] NaLaTi 2 o 6 It is a white powder, insoluble in water, belonging to the perovskite structure with stable chemical and thermal properties. Its quantum paraelectricity at low temperature (less than 50K) makes it exhibit unique dielectric properties, high dielectric constant, low dielectric loss and small dielectric temperature coefficient, making it suitable for multilayer film capacitors, It is a promising candidate material in applications such as microwave communication devices. In addition NaLaTi 2 o 6 It is also an important matrix material for ion conductors. Electrode materials with excellent electrical conductivity can be obtained through element substitution, and are widely used in solid-state batteries ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00B82Y40/00
CPCC01G23/003C01P2002/72C01P2004/03C01P2004/61
Inventor 曹丽云耿乔孔新刚黄剑锋吴建鹏胡海玲
Owner SHAANXI UNIV OF SCI & TECH