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1. 中国科学技术大学物理系
2. 结构研究开放实验室
Published:30 May 1991,
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郭常新, 李碧琳, 金发光. 基质发光材料Na<sub>5</sub>Eu(MoO<sub>4</sub>)<sub>4</sub>和NaEu(MoO<sub>4</sub>)<sub>2</sub>的制备和发光[J]. 发光学报, 1991,12(2): 118-126
Guo Changxin, Li Bilin, Jin Faguang. SYNTHESES AND LUMINESCENCE PROPERTIES OF HOST LUMINESCENT MATERIAL Na<sub>5</sub>Eu(MoO<sub>4</sub>)<sub>4</sub> AND NaEu(MoO<sub>4</sub>)<sub>2</sub>[J]. Chinese Journal of Luminescence, 1991,12(2): 118-126
郭常新, 李碧琳, 金发光. 基质发光材料Na<sub>5</sub>Eu(MoO<sub>4</sub>)<sub>4</sub>和NaEu(MoO<sub>4</sub>)<sub>2</sub>的制备和发光[J]. 发光学报, 1991,12(2): 118-126 DOI:
Guo Changxin, Li Bilin, Jin Faguang. SYNTHESES AND LUMINESCENCE PROPERTIES OF HOST LUMINESCENT MATERIAL Na<sub>5</sub>Eu(MoO<sub>4</sub>)<sub>4</sub> AND NaEu(MoO<sub>4</sub>)<sub>2</sub>[J]. Chinese Journal of Luminescence, 1991,12(2): 118-126 DOI:
本文研究了化学计量的基质发光材料Na
5
Eu(MoO
4
)
4
和NaEu(MoO
4
)
2
.它们都属于四方晶系
空间群为I4
1/α
.NaEu(Mo0
4
)
2
属于白钨矿(scheelite)结构
一个晶胞中有2个分子式NaEu(MoO
4
)
2
(z=2);而Na
5
Eu(Mo
4
O)
4
属于类自钨矿(scheelite-like)结构
一个晶胞中有4个分子式Na
5
Eu(MoO
4
)
4
(
z
=4).X射线衍射确定的晶胞常数
对Na
5
Eu(MoO
4
)
4
α
=1.1439nm和
c
=1.1486nm(密度
d
计算=4.01g/cm
3
z
=4);对NaEu(MoO
4
)
2
α
=0.5236nm和
c
=1.1439nm(密度
d
计算=5.24g/cm
3
z
=2).由差热法和X射线衍射法确定了Na
2
MoO
4
-Eu
2
(MoO
4
)
3
的相图.Na
5
Eu(MoO
4
)
4
分解为NaEu(MoO
4
)
2
的温度是700℃.本文确定了制备纯 Na
5
Eu(MoO
4
)和NaEu(MoO
4
)
2
的方法
并研究了上述两种材料的激发光谱和发光光谱.确定了用X射线粉末衍射谱和发光光谱鉴别Na
5
Eu(MoO
4
)
4
和NaEu(MoO
4
)
2
的方法.在365nm紫外光激发下
Na
5
Eu(MoO
4
)
4
的发光比Na
5
Eu(WO
4
)
4
的强得多
在室温下
Na
5
Eu(MoO
4
)
4
NaEu(MoO
4
)
2
和Na
5
Eu(WO
4
)
4
的相对发光积分亮度比为3.8:3.2:1.0.
Na
5
Eu(MoO
4
)
4
like Na
6
Eu(MoO
4
)
4
is a kind of good stoichiometric host luminescent material having high concentration of Eu
3+
and no concentration quenching effect.The power crystals Na
5
Eu(MoO
4
)
4
and NaEu(MoO
4
)
2
have been synthesized. According to differential thermal and X-ray diffraction analyses
a phase diagram of the system Na
2
MoO
4
-Eu
2
(MoO
4
)
3
has been determined.The methods for synthesizing pure Na
5
Eu(MoO
4
)
4
and NaEu(MoO
4
)
2
have been determined. It shows that Na
5
Eu(MoO
4
)
4
will not be dissociated to NaEu(MoO
4
)
2
when Na
2
MoO
4
is excessive and the ratio of molal concentration of Na
2
MoO
4
to Eu
2
O
3
is more than about 8:1 at sintering temperature lower than 700℃.Both of Na
5
Eu(MoO
4
)
4
and NaEu(MoO
4
)
2
crystallize in the schee-lite structure type and belong to the tetragonal crystal system. The X-ray powder diffraction pattern of NaEu(MoO
4
)
2
was indexed in a"pure" scheelite cell with parameters
α
=0.5236nm and
c
=1.1439nm (d
caic
=5.24g/cm
3
z
=2
space group
I
4
1
/α). Thus
the entire series of NaEu (MoO
4
)
2
compounds is isostructural. But all of the X-ray powder diffraction lines of Na
5
Eu(MoO
4
)
4
can only be indexed in the enlarged scheelite cell with parameters
α
=1.1439nm and
c
=1.1486nm (
d
caic
=4.01g/cm
3
z
=4
space group
I
4
1
/α). In this paper
the cation distribution in the unit cell of both compounds is discussed.The purity of Na
5
Eu(MoO
4
)
4
and NaEu(MoO
4
)
2
samples can be determined sensitively by the intensity analysis of main peaks of the two compounds by X-ray diffraction mathod.The excitation and emission spectra of both compounds have been determined.
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