• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 2003년도 봄 학술발표회 논문집
• /
• pp.773-780
• /
• 2003

The characteristics of soft clays is very important for the land development plan. This study is to investigate correlations between the engineering properties and the characteristics of clay minerals of the disturbed clay samples obtained from Sihwa area. This study included X-Ray Diffraction Analysis, X-Ray Fluorescence Spectrometer Analysis, Scanning Electron Microscopy Analysis and Energy Dispersive X-Ray Spectrometer Analysis. The correlations between the clay mineral properties and the laboratory and field testing results were investigated.

• 암석학회지
• /
• 제3권1호
• /
• pp.34-40
• /
• 1994

High pressure X-ray diffraction study was carried out on a graphite to investigate its compressibility as well as any possible phase transition to the hexagonal diamond structure at room temperature. Energy dispersive X-ray diffraction method was introduced using a Mao-Bell type diamond anvil cell with Synchrotron Radiation. Polycrystalline sodium chloride was compressed together with graphite for the high pressure determinations. Because of the poor resolution of the X-ray diffraction pattern of graphite, its compressibility was estimated to be almost same as that of NaCl by graphite (002) X-ray diffraction peak only. An observation of any new peak from a possible hexagonal diamond phase seems very unplausible for its definite identification based on the present data. Alternative approaches such as an Wiggler Radiation source as well as a Large Volume high pressure apparatus will be necessary for the detailed studies on a graphite in future.

• Applied Microscopy
• /
• 제45권3호
• /
• pp.131-134
• /
• 2015

Here we show how by processing energy dispersive X-ray spectrometry (EDS) data obtained using highly sensitive, new generation EDS detectors in the AZtec LayerProbe software we can obtain data of sufficiently high quality to non-destructively measure the number of layers in two-dimensional (2D) $MoS_2$ and $MoS_2/WSe_2$ and thereby enable the characterization of working devices based on 2D materials. We compare the thickness measurements with EDS to results from atomic force microscopy measurements. We also show how we can use electron backscatter diffraction (EBSD) to address fabrication challenges of 2D materials. Results from EBSD analysis of individual flakes of exfoliated $MoS_2$ obtained using the Nordlys Nano detector are shown to aid a better understanding of the exfoliation process which is still widely used to produce 2D materials for research purposes.

• 한국기계가공학회지
• /
• 제6권3호
• /
• pp.16-23
• /
• 2007

An experimental investigation with diode laser system was carried out to study the effect of surface heat treatment on the die materials(SM45C, SKD11, SK3). The surface heat treatment characteristics of the laser beam are evaluated using hardness tests, optical microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy(EDS). Results indicated that the beam size, focal length, feed rates are changed surface hardened characteristics. SM45C is higher hardness than other materials and composed to martensite grain at hardened zone, whereas other materials(SKD11, SK3)are low hardness than expected and composed to austenite and allayed martensite at hardened zone. The intensive X-ray diffraction patterns of (110)-(200)-(211) is detected hardened surface and the hardened surface distributed plenty of carbon density than metal zone.

• 암석학회지
• /
• 제6권2호
• /
• pp.88-95
• /
• 1997

High pressure X-ray diffraction study was carried out on a polycrystalline graphite to investigate the phase transition(s) at room temperature. Energy dispersive X-ray diffraction method was employed using a Mao-Bell type diamond anvil cell with an Wiggler synchrotron Radiation at the National Synchrotron Light Source. Sodium chloride power was used as the internal pressure sensor for the high pressure determinations as well as the pressure medium for quasihydrostatic pressure environment. Graphite transforms into a hexagonal didose not agree with the previously reported observations and this phase persists when pressure is released down to 0.1 MPa. This result dose not agree with the previously reported observations and this discrepancy would be due to the kinetics in phase transition as well as the uniaxially oriented pressure field in the diamond anvil cell.

• 한국광물학회지
• /
• 제10권2호
• /
• pp.75-81
• /
• 1997

High pressure X-ray diffraction study was carried out on a natural FeO(OH)-goethite to investigate its compressibility at room temperature. Energy dispersive X-ray diffraction method was employed using Mao-Bell type diamond anvil cell with Synchrotron Radiation. MgO powder was compressed together with goethite for the high pressure determinations. Bulk modullus was determined to be 147.9 GPa by the Birch-Murnaghan equation of state under assumption of K0' of 4. This value was subjected to compare with its structural analogs and related materials.

• 한국지반공학회논문집
• /
• 제20권9호
• /
• pp.155-166
• /
• 2004

국내 연약지반 활용을 위한 효율적이고 경제적인 안정처리 공법의 선정과 설계 및 시공을 위해서는 대상지반의 특성을 파악하는 것이 대단히 중요하다. 본 연구는 시화지구 연약점토의 물리적, 역학적 특성과 광물학적 특성을 파악하여 연약점토의 물리적, 역학적 특성과 광물학적 특성과의 상관관계를 알아보는 데 그 목적이 있다. 본 연구에서 는 연약점토의 광물학적 특성을 파악하기 위하여 X선 형광분석, X선 회절분석, 주사전자현미경분석과 에너지분산미분석 실험을 실시하였으며 시화지구 연약지반의 시추조사결과, 실내시험 및 현장시험결과와의 상관관계를 알아보았다. 또한 시화지구 연약점토의 특성을 양산과 군산 지역 연약점토의 특성과 비교하였다.

• 한국결정학회지
• /
• 제7권1호
• /
• pp.20-29
• /
• 1996

(Sr1-xCax)CuO2 단결정을 융제법으로 제조하고 단결정 X-선 회절법을 이용하여 그 결정구조를 밝혔다. 이 화합물의 결정축계는 사방정계(orthorhombic system)이며, 공간군은 Cmcm(63), 그리고 격자상수 a, b, c는 각각 3.4645Å, 16.1417Å, 3.8727Å이었다. (Sr1-xCax)CuO2 화합물에서 Sr대신 치환되는 Ca이온의 한계를 구조적인 관점에서 연구하였다. 이를 위해 X-선 회절(CAD4), energy dispersive X-ray fluorescence (EDAX) and electron probe micro-analysis (EPMA) 등을 사용하였다. Ca가 치환됨에 따른 Cu-O 결합길이의 변화로부터 Ca의 치환한계를 결정하였는데 그 한계치는 Xca≒0.73이었다.

• 공업화학
• /
• 제25권6호
• /
• pp.645-647
• /
• 2014

본 연구에서는 수열합성법을 이용하여, 한단계의 과정으로 $TiO_2$와 Ru (Ruthenium)가 도입된 $TiO_2$ ($Ru_x/TiO_2$)를 합성하였다. 합성된 샘플의 결정성과 조성 및 형태를 X-ray diffraction (XRD)과 energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM)를 통하여 확인하였으며, Benzyl alcohol의 Benzaldehyde로의 산화반응에 촉매로서 적용하였다. 높은 선택성을 가지는 산화반응이 진행되었으며, $TiO_2$에 도입된 Ru의 양이 증가할수록 촉매로서의 더 좋은 촉매활성을 보였다.

• 태양에너지
• /
• 제7권2호
• /
• pp.65-73
• /
• 1987

Microstructural basis for the thermal degradation of electrodeposited black chrome "solar-L-foil" heated in air has been investigated using scanning electron microscopy, energy dispersive x-ray analysis, X-ray diffraction techniques and UV-VIS-NIR spectre-photometer. Experimental result, the change in the shape of the particle comprising the film from their initial needle like structure to a more spherical shape with an oxide after 1hr annealing at $600^{\circ}C$ has been observed. The effect is to degrade solar absorptance of the thin film.