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Method for preparing monoclinic lead tungstate nano belt crystal material

A technology of monoclinic lead tungstate and crystal materials, which is applied in the directions of polycrystalline material growth, crystal growth, single crystal growth, etc., to achieve the effect of clean products, simple operation procedures and few controllable parameters

Inactive Publication Date: 2012-01-11
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, lead tungstate crystals of the first and third structures have been synthesized by various methods, but the synthesis of monoclinic lead tungstate crystals is still very challenging, and there are only a few known synthetic methods Researchers have synthesized monoclinic lead tungstate with a size (length) of less than 1 micron by adding surfactants (organic substances). As for quasi-one-dimensional monoclinic lead tungstate crystals with a length of several hundred microns or even about 1 mm, there is no synthetic report

Method used

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  • Method for preparing monoclinic lead tungstate nano belt crystal material
  • Method for preparing monoclinic lead tungstate nano belt crystal material
  • Method for preparing monoclinic lead tungstate nano belt crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Specific synthesis method of monoclinic lead tungstate nanobelt crystal material

[0031] The raw material for the synthesis of lead tungstate nanobelt crystal material is LiNO 3 、KNO 3 , lead nitrate (Pb(NO 3 ) 2 ), sodium tungstate (Na 2 WO 4 ), ammonia (NH 3 ·H 2 O), the reaction that takes place is as follows:

[0032] (a)Pb(NO 3 ) 2 +2NH 3 ·H 2 O→Pb(OH) 2 ↓+2NH 4 NO 3 ,

[0033]

[0034] The specific operation steps are as follows:

[0035] Step 1. LiNO3 = 10% and KNO3 = 90% are weighed and mixed as reaction solvents.

[0036] Step 2. Weighing as the reactants according to the weight percent of lead nitrate (Pb(NO3)2) = 10%, and the weight percent of sodium tungstate (Na2WO4·2H2O) = 90%.

[0037] Step 3, preparing an alkaline solution by dissolving ammonia in an appropriate amount of water.

[0038] Step 4, heating the reaction, taking the reaction raw materials and reaction solvent added to the reaction vessel as the total weight, the reaction...

Embodiment 2

[0042] Specific synthesis method of monoclinic lead tungstate nanobelt crystal material

[0043] The raw material for the synthesis of lead tungstate nanobelt crystal material is LiNO 3 、KNO 3 , lead chloride (PbCl 2 ), sodium tungstate (Na 2 WO 4 ), ammonia (NH 3 ·H 2 O), the reaction that takes place is as follows:

[0044] (c) PbCl 2 +NH 3 ·H 2 O→Pb(OH) 2 ↓+NH 4 Cl,

[0045]

[0046] The specific operation steps are as follows:

[0047] Step 1, by weight percentage LiNO 3 = 42% and KNO 3 =58% weighed and mixed as a reaction solvent.

[0048] Step 2, press lead nitrate (PbCl 2) weight percentage=51%, sodium tungstate (Na 2 WO 4 2H 2 O) % by weight = 49% Weighed as reactant.

[0049] Step 3, preparing an alkaline solution by dissolving ammonia in an appropriate amount of water.

[0050] Step 4, heating the reaction, taking the reaction raw materials and reaction solvent added to the reaction vessel as the total weight, preparing the reaction raw materi...

Embodiment 3

[0054] Specific synthesis method of monoclinic lead tungstate nanobelt crystal material

[0055] The raw material for the synthesis of lead tungstate nanobelt crystal material is LiNO 3 、KNO 3 , lead acetate ((CH 3 COO) 2 Pb), sodium tungstate (Na 2 WO 4 ), the reaction that occurs is as follows:

[0056]

[0057]

[0058] The specific operation steps are as follows:

[0059] Step 1, by weight percentage LiNO 3 = 42% and KNO 3 =58% weighed and mixed as a reaction solvent.

[0060] Step 2, press lead nitrate (PbCl 2 ) weight percentage=51%, sodium tungstate (Na 2 WO 4 2H 2 O) % by weight = 49% Weighed as reactant.

[0061] Step 3, heating reaction, take the reaction raw materials and reaction solvent added to the reaction vessel as the total weight, prepare the reaction raw materials with a weight percentage of 0.5% to 50% and the reaction solvent with a weight percentage of 50% to 99.5%, and put them into the reaction together Add an appropriate amount of w...

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Abstract

The invention discloses a method for preparing a monoclinic lead tungstate nano belt crystal material, which comprises the following steps of reaction solvent preparation, reaction raw material preparation, alkaline solution preparation, heating reaction, cooling and washing. The method has the following advantages of low reaction cost, easy monitoring and control over all parameters (temperature, pressure and the like) in a reaction process, environmental friendliness and clean product.

Description

technical field [0001] The invention belongs to a preparation method of a nanobelt crystal material, and in particular relates to a preparation method of a quasi-one-dimensional monoclinic lead tungstate nanobelt crystal material. Background technique [0002] In recent years, the demand for high-resolution electromagnetic calorimeters has been increasing. In addition, many high-precision scientific instruments today, such as medical CT scanners, nuclear industrial geological exploration and archaeological equipment, also require a large number of core detection components. High-quality scintillation crystal materials, which makes the work of exploring a new generation of scintillation materials (tungstate crystals) very active. wxya 4 Crystals have been used in the high-resolution electromagnetic calorimeter of the Large Hadron Collider (LHC) due to their unique luminescent characteristics and other properties, and can be applied to medical imaging such as positron emissio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B29/32C01G41/00C01G21/00B82B3/00
Inventor 郑春华胡陈果
Owner CHONGQING UNIV