3. Experiment
재료의 강도와 경도에 영향을 미치는 변수는 다양함.
재료의 밀도가 영향을 크게 미치긴 하지만 그 외에도 상의 형성 방법이나 소결 조건에 따라서도 달라짐.
그래서 재료의 강도 및 경도를 예측할 척도로 밀도를 측정하고자 함
상대밀도로 이론적인 밀도와 상대밀도를 비교하여
tube furnace
ZnO nanocrystals were prepared by a chemical solution deposition (CSD)
The 0.75M precursor solution was deposited onto the Si substrate by spin coating
The as-deposited films were then preheated on a hotplate at 300 C for 10 min. Finally the sample was annealed at 500 C for 1 h.
ZnO powder and graphite powder were ground together
and loaded into an alumina boat
2. Experimental
The films were deposited in a conventional horizontal furnace on Si(1 1 1) substrates. SnO2 (99.99%) (Mol10:2) and ZnO/Ge slices (99.999%, purity), (Mol 10:2) powders were used as the source materials for growth of the Sn- and Ge-doped ZnO films, respectively. The ZnO/SnO2 powder was placed on an alumina boat and inserted into a horizontal tube furnace, in order to serve as th
powders were mixed at a molar ratio of 10:1 @ 40 Mpa
The pill was calcined in a box furnace @ 500 C for 5 h and sintered @900 C for 12 h in the air
1. The powder was placed on an alumina boat and inserted into a horizontal tube furnace
2. Silicon substrates were located downstream from the source material @ 700 and 800 C.
3. A vacuum of 6 Torr was maintained inside the furnace tube during
powder(99.99%) of 0.6g
∙ An alumina boat
∙ A horizontal quartz tube
∙ N-type Si wafer(cleaned by sonication in ethanol & acetone)
∙ Two type of carrier gases(pure argon & oxygen)
∙ Furnace
∙ Microscope
∙ The duration at 500 ℃ of Zn source : 60min
∙ The distance between Zn source and substrate : 34cm
&