YTTRIUM HYDRIDE (in Russian)
The hydride was obtained by the direct reaction of yttrium metal and hydrogen. The hydrogen content was determined volumetrically. Pure Y metal does not adsorb hydrogen at room temperature. By heating the metal initially in vacuum at 400 deg C for 30 minutes, the induction period for the room-temperature hydriding reaction can be lowered to 40 to 60 min. The composition of the pure hydride is YH/sub 1.6/. Yttrium hydride is a blue-gray brittie substance with a density of 4.24 plus or minus 0.15 as compared to a density of 4.91 plus or minus 0.07 for the initial Y metal. The hydride does not change composition on exposure to air for 1 hr, and it reacts slowly with water. Thermographic analysis shows that H/sub 2/ is evolved at 360 to 410 EC with YH left in the residue. At 1100 to 1300 deg C the monohydride decomposes to metallic yttrium. Other rare earth hydrides decompose in a single stage at about 1000 deg C. Other rare earth hy drides are a mixture of the metal and dihydride, but YH/sub 1.6/ does not indicate the presence of Y metal by means of x rays. (TTT)
- Research Organization:
- Kurnakov Inst. of General and Inorganic Chemistry, Academy of Sciences, USSR
- NSA Number:
- NSA-16-022100
- OSTI ID:
- 4827591
- Journal Information:
- Doklady Akad. Nauk S.S.S.R., Journal Name: Doklady Akad. Nauk S.S.S.R. Vol. Vol: 143
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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