| Budget Amount *help |
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 1999: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Research Abstract |
A novel deposition scheme was developed for the synthesis of oriented thin crystal of tantalum-oxide in the abundance of OィイD22ィエD2,aィイD11ィエD1Δmetastable state oxygen and Ooxygen radical. Pulse-train of microwave at 2.45 Ghz, 600W, drives an by an electron-cyclotron resonance plasma in argon diluted oxygen gas. TaィイD22ィエD2OィイD25ィエD2 (tantalum-oxide) was deposited on a fused quartz plate set on a heating holder at 450 degree Celsius. The X-ray diffraction pattern indicated a single peak corresponding to the monoclinic system of β-TaィイD22ィエD2OィイD25ィエD2 with lattice geometry and the angle of,
a=0.731nm,b=1.553nm,c=2.154nm,a=γ=90deg,β=120.35deg
X ray diffraction pattern showed agreement as oriented crystal where the b-c plane was parallel to the substrate. Sputtering rate was 0.6 micro meter/ hr and gradually decreased with increasing the oxygen concentration The peak profile of the X-ray diffraction pattern showed broader peak indicating inferior orientation of thin-crystals corresponding to lower oxygen partial pressure. Thus, an appearance potential mass-spectrometry was employed to clarify the reason. A stepwise decrease in the relative concentration of atomic oxygen was caused by the argon dilution when the argon partial pressure was increased up to 20%. The correlation to the inferior crystal orientation is suggested.
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