• E2M - 전기 전자와 첨단 소재
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• 제8권1호
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• pp.95-101
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• 1995

Crystallizable glasses with precipitation of celsian, anorthite, wollastonite and gahnite were prepared for the purpose of insulating dielectric layers in devices such as integrated circuit substrates. The starting glasses were prepared by melting the batches for 1 hour at 1450.deg. C and then Quenching to a distilled water. And crystallization behavior of these glasses were studied by DTA, TMA, XRD analysis and by the measurement of dielectric properties. The overall composition of the glass-ceramic consists in weight percent of 30-35% A1$_{2}$O$_{3}$, 13-26% BaO, 5-21% CaO, 10-24% ZnO, 4.5-9.0% TiO$_{2}$ and 4-8% B$_{2}$O$_{3}$. As a result, in barium-rich glasses only celsian phase was developed in the range of 850-900.deg. C. Also, the thermal expansion coefficient, dielectric constant and quality factor of these glass-ceramics were 68*10$^{-7}$ /.deg. C, about 9 and more than 1000, respectively.

• 대한치과기공학회지
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• 제26권1호
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• pp.77-88
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• 2004

Glass ceramics for dental crown prosthesis were prepared by crystallization of CaO-MgO-SiO2-P2O5-TiO2 glasses. Their crystallization behaviors have been investigated as a function of heattreatment temperature and holding time in relation to mechanical properties. The results are as follows: Vickers hardness and bending strength of glass ceramics increased due to the precipitation of apatite, whitlockite, $\beta$-wollastonite, magnesium titanate, and diopside crystal phases within glass matrix. The final crystalline phase assemblages and the microstructures of the glass ceramics were found to be dependent on heat-treatment temperature and holding time. Vickers hardnes and bending strength of glass ceramics increased with increasing heat-treatment temperature and holding time.

• 자원환경지질
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• 제29권1호
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• pp.11-21
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• 1996

The first Mg-skarn minerals are found from magnetite ore deposits of the Janggun mine, Korea. The skarn minerals are composed of mostly chondrodite, olivine， chlorite, serpentine, phlogophite, talc, apatite, magnesite， dolomite, siderite and trace amount of clinopyroxene, amphibole, garnet, wollastonite associated with magnetite, pyrrhotite and pyrite. The skarn zone is developed in the magnetite deposits at the contact of the Mg-rich Janggun Limestone Formation and the Chunyang granite. The chondrodites are columnar and radial shapes and some of them show twins. The chemical compositions of twinning-type chondrodites have high FeO (4.63 to 5.6 wt%), MnO (0.26 to 0.46 wt%) and low MgO (55.02 to 56.18 wt%) relative to the radial-type chondrodites. Twinning in chondrodite has been formed in close relation to substitution between Mg and Fe + Mn in humite solid solution. Temperature, $-logfo_2$ and $X_{CO2}$ during the skarn stage of magnetite deposits from the Janggun mine range from 395 to $430^{\circ}C$, from 30.5 to 31.2 atm and from 0.06 to 0.09, respectively.

• 한국세라믹학회지
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• 제20권2호
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• pp.153-160
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• 1983

This study was carried out to research the change of mineral phases and the characteristics(apparent specific gra-vity water absorption firing shrinkage modulus of rupture thermal expansion and specific dielectric constant) of the sintered bodies manufactured by kaolin and limestone. Samples were composed of the same theoretical composition as it of anorthite and fired up to 145$0^{\circ}C$ Investigated the change and micro-structure of the mineral phases by XRD and SEM the characterisdtics of the sintered bodies by TMA Automatic Capacitance Bridge and etc. The results were as follow. 1. Reactions of sintering are occurred between 860-95$0^{\circ}C$ and 1200-138$0^{\circ}C$ and state of bloating is occurred at 1410-145$0^{\circ}C$ 2. For the inclusion of feldspar and its fine particles of materials the temperature of producing and collapsing is decreased. 3. Pseudo-wollastonite and gehlenite are formed about 95$0^{\circ}C$ 4. At 114$0^{\circ}C$ anorthite are begin to forming and increase continuously to 138$0^{\circ}C$. Above 141$0^{\circ}C$ content of anorthite are decreased. 5. The variations of bending strength with sintering temperature reflect similar trend of sintered contraction and in-crease continuously from 120$0^{\circ}C$. At 145$0^{\circ}C$ reached about 680kg/cm2. 6. Specific dielectric constant$($\varepsilon$_s)$ of specimen sintered at 141$0^{\circ}C$ is 7.12 and that value is most favorable.

• 자원환경지질
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• 제14권4호
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• pp.167-182
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• 1981

신예미광상(新禮美鑛床)의 스카른 광물(鑛物)은 1) 석류석(石榴石)-휘석(輝石)-금운모(金雲母)-규회석(硅灰石) 조합(組合)군집, 2) 석류석(石榴石)-휘석(輝石) 조합(組合), 3)석류석(石榴石)-녹렴석(綠廉石) 조합(組合)으로 구분(區分)된다. 이들 광물조합(鑛物組合)은 광석광물(鑛石鑛物)의 산출상태, 광석광물(鑛石鑛物)의 종류(種類) 그리고 광화작용(鑛化作用)의 시기(時期)와 밀접한 관계(關係)가 있다. 석류석결정(石榴石結晶)의 분석(分析)에 의하여 석류석결정(石榴石結晶)의 누대구조(累帶構造)는 결정(結晶)의 성장시(成長時)에 평형조건(平衡條件)의 변화(變化)에 기인한 화학적(化學的) 누대구조(累帶構造)(chemical compositional zoning) 이다. 그리고 광상(鑛床)의 생성환경(生成環境)과 관계화성암(關係火成岩)의 위치(位置)를 스카른광물(鑛物)의 산출상태와 스카른 광물중(鑛物中) 석류석(石榴石)의 화학성분(化學成分)의 검토에 의해 추정해 보았다.

• 한국지반환경공학회 논문집
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• 제17권10호
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• pp.63-71
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• 2016

국내 폐석면 오염지역의 복원공사는 대부분이 토양개량 공법인 복토와 환토 공법을 일률적으로 적용하고 있으나 토양개량 방법만으로는 석면오염을 근원적으로 해결할 수가 없어 새로운 대체기술에 대한 연구가 수행되어오고 있다. 본 연구에서는 풍력장치를 이용한 실내시험 결과를 종합하여 실제 현장에 적용할 수 있는 풍력정화장치를 설계 제작하였으며, 규회석을 이용한 예비시험 및 실제 석면오염토를 이용하여 농경지토양에 대한 정화효율에 대한 연구를 수행하였다. 석면오염토에 대한 현장시험결과 토출직후 석면함유량은 모두 0.25% 미만으로 정화기준을 만족하였으며, 청토회수율 90% 이상을 확보한 것으로 분석되어 향후 석면오염토양 정화분야의 적용성이 뛰어난 것으로 판단된다.

• 한국토양비료학회지
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• 제20권3호
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• pp.231-240
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• 1987

습답개량(濕畓改良)에 관(關)한 기초자료(基礎資料)를 얻기 위(爲)하여 사양토(砂壤土)와 식양토(埴壤土)에 투수속도(透水速度)를 달리한 조건(條件)에서 규회석(珪灰石) 및 생고등(生藁等) 개량제(改良劑) 시용시(施用時) 벼의 생육(生育)과 수량(收量)에 미치는 영향(影響)을 밝히기 위(爲)하여 pot 시험(試驗)을 실시(實施)한 결과(結果)를 요약(要約)하면 다음과 같다. 1. 벼 수량(收量)은 사양토(砂壤土)와 식양토(埴壤土) 두 토양(土壤) 공(共)히 투수속도(透水速度)가 클수록 많았으며 그 효과(效果)는 식양토(埴壤土)가 사양토(砂壤土)에 비(比)하여 더욱 컸다. 2. 토양용액중(土壤溶液中)의 환원생성물(還元生成物)은 투수속도(透水速度)에 따라 초기(初期)에 높았으나 생육후기(生育後期)에 많이 제거(除去)되었다. 3. 식물체중(植物體中)의 질소(窒素), 인산(燐酸), 가리등(加里等)은 투수속도(透水速度)의 증가(增加)에 따라 낮아지지만 규산(珪酸)은 오히려 높아졌다. 4. 투수속도(透水速度)가 빠를수록 수확기(收穫期) 뿌리의 양(量)도 많고 근권(根圈)이 지하(地下) 깊이까지 확장(擴張)되었다.

• 자원환경지질
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• 제20권3호
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• pp.169-177
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• 1987

The Manjang copper magnetite-fluorite orebodies are imbedded within the limestone beds of the Hwajonri Formation. The ore deposits are characterized by magnetite-fluorite bearing skarn orebody in the west orebody and copper sulfide veins of the central and main orebodies. This study includes fluid inclusion geothermometry, salinity analysis, stable isotope analysis, and application of phase rule to mineral associations in skarn ore. Ore minerals are closely associated with the skarn silicates such as garnet, wollastonite and epidote. Magnetite and fluorite are remarkable in the west orebody whereas chalcopyrite is dominate in the central and main orebodies where pyrite and pyrrhotite also appear as sulfide gangues. Homogenization temperature and salinity of fluid inclusions are measured ranging between $240^{\circ}C$ and $350^{\circ}C$, 6.3~12.9 wt. percent in quartz and $220^{\circ}C$ and $350^{\circ}C$, 8.5~9.9wt. percent in fluorite, respectively. This indicates that the filling temperature and salinity are higher in quartz than in fluorite with the tendency of both to be linearly decreased suggesting an attribution of meteoric water to the mineralization. $T-fo_2$ diagram in the Ca-Fe-Si system at 1 kb and $Xco_2$=0.02 shows that the mineral assemblages with decreasing temperature are andradite-hedenbergite-calcite, hedenbergite-andradite-quartz, magnetite-andradite-quartz, and magnetite-quartz-calcite, indicating that magnetite crystallizes mostly late skarn stage at lower temperature. According to the carbon and oxygen isotopic values of the host limestone and calcite in ores, the sourec of carbon might be mixture of host limestone and deep seated carbons. Sulfur isotope data imply that ore fluids be relatively homogeneous in sulfur isotopic composition, mainly derived from igneous source.

• 자원환경지질
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• 제12권3호
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• pp.115-126
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• 1979

The Jecheon granite mass has turtle-shape exposure of about $190km^2$ at vicinity of Jecheon-eup, and is elongated in the direction of NEE-SWW. It discordantly intrudes the Bakdalryong metamorphic rocks and the great limestone series(Samtaesan and Hungwolri formation) which belong to the pre-Cambrian and Ordovician, respectively. The mass is composed of five facies of different grain size; texture and charecteristic minerals. The five facies are (1) coarse grained biotite granodiorite, (2) fine grained hornblende biotite granodiorite, (3) coarse grained pink feldspar granodiorite (4) leucogranite, and (5) porphyritic biotite granite. The mutual relationship between each facies is intrusion in (1)-(2) and (2)-(3), but unknown in (3)-(4) and (4)-(5). 22 modal analyses and and 10 chemical analyses on more than a hundred of representative samples taken from the mass are listed as tables. Triangular plot of modal and normative Q-Kf-Pl of this mass show a continuous differentiation products from certain common magma by change of chemical composition and anorthite contents in plagioclase. The metamorphic facies of contact aureole in surrounding rocks adjacent to the granite body are corresponded to hornblende hornfels facies with mineral assemblages of wollastonite-diopside-calcite in calcareous rocks, and of quartz-biotite-muscovite-cordierite in argillaceous rocks. Variation of silica versus oxides of major elements shows that the mass is similar to the trend of Daly's average basalt-andesite-dacite-rhyolite which shows the trend of the fractional crystallization of magma, and is equivalent to the calc-alkali rock series by Peacock. AMF diagram shows that Jecheon granite mass is equivalent to normal diffentiation products such as skaergaard intrusion. The above evidences suggest that the Jecohon granite mass is normal differentiation products formed by fractional crystallization under relatively slow cooling condition.

• 자원환경지질
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• 제18권2호
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• pp.139-150
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• 1985

Skarn at the Dielette formed largely in calc-silicate hornfels at the contact with the Flamanville granite. The skarn consists mainly of garnet and pyroxene, and less frequently vesuvianite. Traversing toward calc-silicate hornfels wall rock from a central zone of the skarn, the general sequence of formation of mineral assemblages is: (1) dark brown garnet (2) pale brown garnet-vesuvianite-pyroxene, and (3) pyroxene-prehnite-scapolite-wollastonite envelopes (designated as transition zone) developed between skarn and calc-silicate hornfels. The central zone of the skarn consists mainly of dark brown garnets (garnet I) that contain little or no pyroxene. The pale brown garnet (garnet II) is associated with pyroxene and vesuvianite. The sequence of these garnets results from the zonal growth outward. There is an abrupt discontinuity in composition between garnet I formed in early stage and garnet II in late stage, while each garnet shows relatively uniform composition. At the zone in contact with the granite, the iron contents of garnets decrease toward the marginal zone of the skarn, from an average value of 36 mole % andradite in garnet I to 18 mole % andradite in garnet II. At the zone distant from the granite, the andradite component decreases from 28 mole % in garnet 1 to 19 mole % in garnet II. The variation of the iron contents of pyroxenes is also similar to that of garnets. The sharp discontinuity in composition of garnets and pyroxenes suggests that the skarn of study area was formed by infiltration metasomatic process. The results of the analyses of mineral assemblages of the transition zone by chemical potential diagrams suggest that the transition zone was made by the diffusion of the elements Ca, K and Fe from the skarn to the calc-silicate hornfels contact zone. The estimated temperatures and $Xco_2$ for the formation of the transition zone show $300^{\circ}C$$440^{\circ}C$ and $0.07{\pm}0.05<Xco_2<0.02{\pm}0.01$ at 1 Kb respectively.