[en] In order to help solve or prevent corrosion problems in light water reactor (LWR) systems at high temperatures, Pourbaix (potential-pH) Diagrams are presented for Fe-H₂O, Fe-Cl-H₂O, S-H₂O, Fe-S-Cl-H₂O, Ni-H₂O, Ni-Cl-H₂O, Ni-S-H₂O, and Ni-S-Cl-H₂O systems at 25, 100, and 200⁰C. The diagrams are set forth in an interpretive format which enables the user to consult them without detailed knowledge of their construction. Important limitations regarding their use are emphasized. Examples of application given in this report are: chloride and/or caustic corrosion and corrosion cracking, effectiveness of chemical cleaning in acidic and caustic solutions, solubility information for iron oxides, and corrosion inhibition due to chromate or dichromate ions

[en] Laboratory testing was conducted and electrochemical measurements were made to develop an understanding of the conditions controlling the behavior of ferric (Fe⁺³) and ferrous (Fe⁺²) ions in solutions of ethylenediaminetetraaceticacid (EDTA) and hydrazine (N₂H₄). Such solutions are being considered for use in the chemical removal of magnetite (Fe₃O₄) deposits from the secondary side of pressurized water reactor (PWR) steam generators

[en] This final report summarizes the results of a program to devise a general computer method of estimating potential-pH diagrams for metals in water at temperatures from 25⁰C to 300⁰C. The computer program uses literature data for room temperature and either literature data where available or standard estimation procedures, especially for ions in solution, to calculate relative thermodynamic stabilities of the various possible compounds of an element at temperatures up to 300⁰C. The program identifies the regions in which various phases are stable and presents the stability fields in a potential-pH diagram for a metal in water. In addition to the computer program itself, the report presents numerous potential-pH diagrams for specific elements in water or various temperatures

[en] This final report summarizes the results of a program to devise a general computer method of estimating potential-pH diagrams for metals in water at temperatures from 25⁰C to 300⁰C. The computer program uses literature data for room temperature and either literature data where available or standard estimation procedures, especially for ions in solution, to calculate relative thermodynamic stabilities of the various possible compounds of an element at temperatures up to 300⁰C. The program identifies the regions in which various phases are stable and presents the stability fields in a potential-pH diagram for a metal in water. In addition to the computer program itself, the report presents numerous potential-pH diagrams for specific elements in water or various temperatures

[en] This final report summarizes the results of a program to devise a general computer method of estimating potential-pH diagrams for metals in water at temperatures from 25⁰C to 300⁰C. The computer program uses literature data for room temperature and either literature data where available or standard estimation procedures, especially for ions in solution, to calculate relative thermodynamic stabilities of the various possible compounds of an element at temperatures up to 300⁰C. The program identifies the regions in which various phases are stable and presents the stability fields in a potential-pH diagram for a metal in water. In addition to the computer program itself, the report presents numerous potential-pH diagrams for specific elements in water at various temperatures

[en] We investigate low-temperature epitaxial growth of thin silicon films by HWCVD on Si [1 0 0] substrates and polycrystalline template layers formed by selective nucleation and solid phase epitaxy (SNSPE). We have grown 300-nm thick epitaxial layers at 300 deg. C on silicon [1 0 0] substrates using a high H₂:SiH₄ ratio of 70:1. Transmission electron microscopy confirms that the films are epitaxial with a periodic array of stacking faults and are highly twinned after approximately 240 nm of growth. Evidence is also presented for epitaxial growth on polycrystalline SNSPE templates under the same growth conditions

No abstract available

[en] We have studied systematically the effect of microwave irradiation on the temperature dependent resistivity R(T) and the current-voltage (I-V) characteristics of YBa₂Cu₃O_7-x (YBCO) bicrystalline grain boundary weak-links (GBWLs), with grain boundary of three different tilt angles. The superconducting transition temperature, T_c, has significant enhancement upon microwave irradiation. The microwave enhanced T_c is increased as a function of incidence microwave power, but limited to an optimum power level. The GBWLs of 45 degrees tilt boundary has shown to be most sensitive to the microwave irradiation power, and the GBWLs of 36.8 degrees tilt boundary has displayed a moderate response. In contrast, no enhancement of T_c was observed in the GBWLs of 24 degrees tilt boundary, as well as in the uniform films. Under the microwave irradiation, the R(T) dependence is hysteretic as the transition taken from superconducting state to normal state and vice versa. Mechanisms associated with the redistribution of nonequilibrium quasiparticles under microwave irradiation are discussed

[en] The Harwell type 95/0075 survey meter developed by Leake is widely used in neutron area monitoring. Since the neutron directional distribution for a stray field often remains unknown, it is important to determine the angular response and the collimated beam response of the detector. It is also important to clarify the relationship between these responses and the detector structures. This study aims to determine the angular response and the collimated beam response of a detector based on Leake's design. The results suggest that the detector angular response is isotropic for fast neutrons; and local dependence of the response to collimated beams of thermal and intermediate energy neutrons was found to be independent of the absorber layer variations. (Author)

No abstract available