Hydrothermal Synthesis of MgWO<SUB>4</SUB> and Its Luminescence

LI Jin-qing; YANG Chuang-tao; MENG Jian-xin

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Hydrothermal Synthesis of MgWO₄ and Its Luminescence

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- Hydrothermal Synthesis of MgWO₄ and Its Luminescence
- Chinese Journal of Luminescence Vol. 30, Issue 3, Pages: 327-331(2009)
- 作者机构：
  
  1. 暨南大学化学系,广东广州,510632
  2. 暨南大学纳米化学研究所,广东广州,510632
- 作者简介：
- 基金信息：
- DOI：
  CLC： O482.31
- Received：04 September 2008，
  
  Revised：02 January 1900，
  
  Published Online：30 June 2009，
  
  Published：30 June 2009
- 稿件说明：
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LI Jin-qing, YANG Chuang-tao, MENG Jian-xin. Hydrothermal Synthesis of MgWO₄ and Its Luminescence[J]. Chinese journal of luminescence, 2009, 30(3): 327-331.
DOI：

LI Jin-qing, YANG Chuang-tao, MENG Jian-xin. Hydrothermal Synthesis of MgWO₄ and Its Luminescence[J]. Chinese journal of luminescence, 2009, 30(3): 327-331. DOI：

摘要

以硝酸镁、钨酸钠为原料

氢氧化钠和硝酸作为pH调节剂

在180~230 ℃水热条件制备纯相的MgWO

。探讨了水热反应温度对MgWO

纯相形成以及煅烧温度对其晶型、发光性质的影响。分别用粉末X射线衍射、荧光光谱、扫描电子显微镜和综合热分析等手段对样品进行表征。结果表明

水热法可以直接制得不含结晶水MgWO

晶体

属于四方晶系

形貌呈片状

厚度约为几个纳米。样品热重分析和高温煅烧的结果表明

水热法所得MgWO

晶体在850 ℃附近出现晶型转化

由四方晶系转变为单斜晶系

并导致发光性质的明显变化。SEM显示煅烧前的样品形貌为片状

不同温度煅烧后由片状逐渐向棒状转变。

Abstract

MgWO

is a self-activated luminescent material

chemical and luminous properties are stable. It has high quantum efficiency and has been used as lamp phosphor for a long-term. MgWO

is usually prepared by solid-phase method using high purity MgO or MgCO

mixture with WO

then sintered at about 1 200 ℃ for several hours. Solid-phase approach leads to unhomogeneous distribution of sample size

the particles easily reunion

and the particle size is difficult to control

but hydrothermal method can overcome these shortco-mings. In recent years

hydrothermal method has been used to synthesis some kinds of tungstate samples

such as BaWO

NaLa(WO

)

PbWO

and so on

but to synthesis MgWO

it has not been reported.Amberg and John.R synthesized pure MgWO

·H

O and MgWO

·2H

O by mild hydrothermal method

but without studying on their luminescent properties. This article reports about using hydrothermal method to synthesis MgWO

crystal without crystalline H

O. A pure phase MgWO

was synthesized by hydrothermal method from Mg(NO

)

and Na

solutions. The effects of hydrothermal temperatures on lattice phase

sintering temperatures on the morphology

structure and fluorescence intensity of MgWO

powder were investigated. Samples were characterized by X-ray diffraction (XRD)

fluorescence spectrometer

scanning electron microscope(SEM) and TG-DSC. The results showed that MgWO

without crystalline H

O molecule can be synthesized at 180~230 ℃ hydrothermal temperatures. The as-prepared sample has a tetragonal structure and transfer to monocline structure when sintered at 850 ℃ or higher temperature. Fluorescence spectra showed that MgWO

has a broad emission band peaked at 480 nm. The emission intensity becomes stronger as the sintering temperature increases from 750 ℃ to 1 050 ℃. SEM images showed that the size of MgWO

particles increases with the sintering temperature.

关键词

Keywords

references

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. Amberg M, Günter J R, Schmalle H, et al. Preparation, crystal structure, and luminescence of magnesium molybdate and tungstate monohydrates, MgMoO4·H2O and MgWO4·H2O [J]. J. Solid State Chem., 1988, 77 (1):162-169.

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Hydrothermal Synthesis of MgWO4 and Its Luminescence

DOI：

摘要

Abstract

关键词

Keywords

references

Hydrothermal Synthesis of MgWO₄ and Its Luminescence