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The FCD have been in operation since 1999. FCD shares
neutron beam with the HRPD from the ST2 beam port. A
mosaic Ge(331) monochromator with a fixed take-off angle
of -45 degree could be mounted between the beam gate
and first collimator unit inside the main HRPD shielding.
FCD is a conventional two0-axis diffactometer with an
Eulerian cradle and used for the structural study of
sinngle crystals and for the texture measurements for
industrial applications.
HANARO Neutron Four Circle Diffactometer(FCD)
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Design Characteristics
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- 2ΘM=-45℃
- Monochromator : Ge(331),
λ=0.997Å
- Collimation : α1=20', 30', open(52')
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α255'
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α318', 30', open(60')
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Detectors : He-3 gas proportional counter
and 2D-PSD
- Neutron Flux : 6.6 x 105 n/cm2sec
@sample position
- Beam size : diameter
30mm @sample position |
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Application fields of FCD
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ㆍSingle Crystal Diffactometry
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Determination of crystal structure and magnetic
property(magnetic structure)
- Phase
transtition(temperature dependence of structures)
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Hydrogen-deuterium problem
- Atoms and
molecular disorder
ㆍTexture
in Alloys
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Correlation of texture and anisotropy
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Quantitative analysis of texture sample
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Evolution of texture measurement to use
2D-PSD
- Evolution of in-situ texture
measurement at environment of sample texperature,
...tensile
strength, etc |
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The HANARO FCD is installed at the ST2 beam port
in the end of 1999 and shares neutron beam
with HRPD. A mosaic Ge(331) monochromator
with a fixed take-off angle of -45 degree
could be mounted between the ST2 beam gate
and first collimator unit inside the main
HRPD shielding with a beam height of 40mm
lower than beam center of HRPD. The wavelength
of the neutron beam for this monochromator
is 0.997Å. The effective beam size at the
sample position is 30mm in diameter.
A
detector unit with a single He-3 counter
is connected to the 2Θ-table with a counter
weight. For fast and wide measurement we
have a 2-dimensional position sensitive
detector(2-D PSD) without fixed shielding.
This year, we are going to make shielding
unit of 2-D PSD. This 2-D PSD unit can use
alternating each other with the another
detector unit with a single He-3 counter.
A
CCR-type low temperature cryostat and a
high temperature furnace allow temperature
dependent structure investigations in the
temperature range from 10 K to 300 K and
from 300 K to 1300 K.
FCD servers for
single crystal structure analysis and texture
studies. Typical applications are to analyse
the hydrogen distribution, the molecular
disordering, the magnetic structure, and
the measurement of structural as well as
magnetic phase transitions. FCD will serve
for struchural studies of materials related
to ceramic and protein crystallography. |
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Sample environments and major
components
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Range : 300K～1300K
heating, cooling rate : 6～10℃/min
Resolution : ±0.2℃
Output : 80W at 1300K
heater : NiCr-Ni
sample hold : Nb
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Vacum Furnace
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Range : 10K～800K
Power : cooling 2.5W at 20K
heating 22W at 800K
Cooling rate (to 20K): 50min at 60Hz
Heating rate : 17.5K/min
Thermometer : Si diodes, Pt
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CCR(Closed-Cycle Refrigerator)
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Size : 360×360×90mm
Detector area : 190×190mm
Position resolution : 1.5×1.5mm
Efficiency : 60%(@1Å)
Rate capability : up to 500kHz
Detection Gases :
He-3(4bar)+CF4(2bar)
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2D-PSD(Position Sensitive Detector)
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Size : Dia.-50mm, h-100mm
Effective length : 88mm
Gas : He-3(5bar)
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He-3 gas proportional counter
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Representative Publications
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1. Neutron diffraction study of K(H1-xDx)2PO4,
Appl. Phys. A, 74, S1194-S1196(2002)
2.
하나로 4축 단결정 회절장치용 고온시료환경장치의
개발: LiTaO3의 상온 및 고온 구조
...연구,
한국광물학회지, 15권,140-44 (2002)
3.
QPA of Retained Austenite in TRIP-Aided
Cold Rolled Steels Using Neutron
Diffraction,
Materials Science Forum, 408-412, 1383-1388
(2002)
4. Quantitative phase analysis
of strongly textured alloy mixtures using
neutron
diffraction,
Applied Cryst. 35, 571-576 (2002)
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