THE STOICHIOMETRY AND RESISTIVITY OF PrOx
Praseodymium oxide (PrO/sub x/) has several stable intermediate compounds between PrO/sub 1.5//sub 0/ and PrO/sub 2.0//sub 0/. At constant temperature the composition may be expressed as a function of temperature. It was found that in the critical regions, the pressure-ascending isotherms are not superimposable on the pressure-descending isotherms. A hysteresis was observed between most of the neighboring pairs of compositions, leotherms were measured using a quartz-beam microbalance. It was found that for large x values, PrO/sub 1.8//sub 3/, PrO/sub x/ is an n-type semiconductor; whereas for low x values, Pr/ sub 2/O/sub 3/, it is p-type. The resistance of the sample was measured at temperatures to 1100 deg C. In a plot of log R(R = resistance) vs. 1/T, the resistance at 925 deg C appeared to be a pivot point, indicating the transition temperature. The vacuum isobars also showed several linear regions with breaks at significant temperatures. (M.C.G.)
- Research Organization:
- Purdue Univ., Lafayette, Ind.
- NSA Number:
- NSA-15-010770
- OSTI ID:
- 4083321
- Report Number(s):
- AFOSR-TN-60-1455
- Country of Publication:
- United States
- Language:
- English
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