preparation of metallic halides scintillation crystals n2ap-79 ...tetra-silico-iodoform iodide...
TRANSCRIPT
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NaI＋H2O=NaOH+HI2NaOH+SiO2=Na2SiO3+H2O
Wetting and Sticking Process
“Liquinert” Process
CI４＋H2O= COI2+2HI COI2＋H2O= CO2+2HI
RAP : Reactive-gas Atmosphere Processing
Water removal technology“Liquinert ” is non-wetting and
non-reactive state of molten inorganic
materials at each melting temperature.
This word was proposed by Sakuragi in 1995.
“Liquinert “ Liquid is in an inert state.
“Liquinert” melt becomes spherical shape.
Atmosphere
Θ～１８0°
Θ：contactangle
Melt
Crucible
Water repellency represents the
sphere shape water on a plant leaf
at around room temperature
WaterTaro
leaf
Water repellency
KCl, Ge, CaF2
Spherical
“Liquinert” Crystals
Four Pieces of Ge
“Liquinert” Crystals
“Liquinert”
Si droplets
1, “Liquinert “ and Water repellency
Shiro Sakuragi, Union Materials Inc. Japan
IEEE/MIC, Sun Diego, USA
November 03, 2015
2, Advantages of the “Liqinert” Process in Bridgman Method
High quality crystal
High material yield
Reusable crucible
Advantages
Heater Crucible
Crystal
Melt
Taking out
Non-sticking Crystal
Puling down
Sticking free from crucible
3, Preparation of SrI2(Eu) crystals by the “Liqinert” Process
The “Liqinert” Process
Dehydration under vacuum；Removal of 99.99% of waterRAP Method；Perfect removal of water
Carbon
Tetra-
Iodide
Iodoform
Silicon
Tetra-
Iodide
Silico-
iodoformIodide
Phosgene
CI4
Material
Formula CHI3 SiI4 SiHI3 COI2
Examples of
RAP agent
for iodides
4, Preparation of SrI2(Eu) right cylinder single crystals by the “Liquinert”
5, Conclusion
1. Metallic halides scintillation crystals have been successfully prepared by the “Liquinert” process.
2. SrI2(Eu） single crystals of Φ2 in cylinder and 1inx1in right cylinder were grown by V.B. method.3. We have got 3.6% order energy resolution for 662KeV with Φ2 in and 1inx1in square SrI2(Eu） detectors respectively. 4. Square SrI2(Eu） detectors with coupled of Si-PM may be promising for medical and other applications.
Preparation of Metallic Halides Scintillation Crystals
by the "Liquinert" Process
N2AP-79
Example of
RAP reaction of iodides
SiI4＋H2O= SiOI2+2HI SiOI2＋H2O=SiO2+2HI
Crystal size
Top: 25.4x25.4x10mm
Bottom:12.5x12.5x10mm
Top: 27x27x100mm
Middle: 14x14x110mm
Bottom: 11x11x100mm
SrI2(Eu) ｒightcylinder Crystals
Square SrI2(Eu)
detectors
12㎜6㎜4㎜2㎜ 3㎜
GaAs Single Crystal
for electronics
Φ50x60㎜ 1988
Examples of Bridgman Grown
Crystals by the “Liquinert” Process
KCｌ Single Crystalfor Infrared Optics
Φ240x200mmH
1982
Examples of Metallic Halides Scintillation
Crystals Obtained by the “Liquinert” Process
CsI(Tl) Crystals
for CLEOⅡ of Cornell University
Φ70x380㎜L 1985
CsI(Tl) Crystals
by VB method (a)
and HB method (b)
1995
(a)
(b)
We are now available of high performance
Si-PM with thin and square shape .
Why do we need SrI2(Eu)
right cylinder crystals ?
AdvantagesSimple machining process
High material yield
Cost effective
Compact detector with Si-PM
Wetting and adhesive material
Φ1.5” Crystal
Liquinert SｒI2(Eu) melt and Crystals
No floating scum,
No inclusion
Φ26mm
Φ2” Crystal
meltmelt
FWHM=3.67%
SrI2(Eu)
25.4x25.4x10mm
Energy spectra for 662KeV 137-Cs
of 25.4x25.4x10mm with PM
Energy spectra for 662KeV 137-Cs
662KeV
FWHM=3.64%
Eｎcapsulated 1.5 in SrI2(Eu) Detectors
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