| Capacitive Energy Storage at Cryogenic Temperatures. Phase 2 |
12 FEB 89 |
148 pages |
| Authors:
C. F. Clark; CERAMPHYSICS INC WESTERVILLE OH
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 | The primary goal of this Phase II program was to improve the dielectric breakdown strength of ceramic multilayer capacitors (MLC's) in order to improve capacitive energy storage at liquid-nitrogen temperatures. A secondary goal was to explore the reproducibility of a field-enforced state- switching effect discovered in the Phase I program. The ceramic composition involved in these programs is designated as CPN17 and has a dielectric constant in the range 8,000-10,000 ... |
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| Research on High-Specific-Heat Dielectrics |
11 MAY 87 |
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| Authors:
W. N. Lawless; C. F. Clark; B. R. Patton; P. K. Kahol; N. S. Dalal; CERAMPHYSICS INC WESTERVILLE OH
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 | This Annual Report details a program of research on composite spinel ceramic materials with enormous specific heat maxima in the temperature range 5- 20 K. The results obtained so far have suggested an attractive picture for the ordering phenomena in the B-site spinels, CdCr2O4 and ZnCr2O4. Significant progress in characterizing and controlling the fabrication of the spinel materials has been made. Pure powders, compacted disks, as well as the 9/1 ... |
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| Capacitive Energy Storage at Cryogenic Temperatures |
23 JAN 86 |
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| Authors:
C. F. Clark; CERAMPHYSICS INC WESTERVILLE OH
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| Intial microstructure studies of multilayer capacitors (MLC) have been completed and have shown the presence of a second phase which can be correlated with the 'state switching' phenomena. Most other planned MLC sets embodying a large number of parameter variations have been made and are currently under evaluation. Thermal properties of MLC's have been measured and a heat flow model has been developed to describe temperature measured and provide clues ... |
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| High Specific Heat Dielectrics and Kapitza Resistance at Dielectric Boundaries |
30 SEP 85 |
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| Authors:
P. W. Eckels; W. N. Lawless; J. H. Parker Jr.; B. R. Patton; C. F. Clark; WESTINGHOUSE RESEARCH AND DEVELOPMENT CENTER PITTSBURGH PA
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| This program has two efforts: Kapitza and thermal properties studies. Two separate Kapitza conductance test facilities have been designed and fabricated for both solid solid and for solid liquid HE II measurements. Preliminary data has been obtained for copper to T lambda C lambda interface conductance and also for KBr and LiF thermal conductance to Helium II. For the latter two materials, the test dewars were designed to allow cleaving ... |
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| Capacitive Energy Storage at Cryogenic Temperatures |
15 FEB 85 |
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| Authors:
W. N. Lawless; C. F. Clark; CERAMPHYSICS INC WESTERVILLE OH
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| A Phase I research program on capacitive energy storage at liquid- nitrogen temperatures is reported. A composition in the cadmium-lead-niobate- tantalate family of ceramic ferroelectrics was chosen with a paraelectric to ferroelectric phase transition at 71 K (so-called CPN17 composition), and prototype multilayer capacitors (MLC's), 1 x 1 x 0.2 cc with 46 active layers, were fabricated for testing. Dielectric-constant, specific-heat, and electrocaloric data were measured on these MLC's in ... |
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| Method for Preparing Ternary Mixtures of Ethylenediamine Dinitrate, Ammonium Nitrate and Potassium Nitrate. |
06 DEC 1983 |
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| Authors:
K. L. Wagaman; C. F. Clark; L. D. Henderson; W. S. Jones; DEPARTMENT OF THE NAVY WASHINGTON DC
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| An explosive ternary nitrate mixture of ethylenediamine dinitrate, ammonium nitrate, and potassium is prepared by mixing together approximately stoichiometric amounts of aqueous nitric acid, ethylenediamine, ammonia, and potassium hydroxide at a temperature of less than about 130 C. The additions can be made simultaneously or sequentially in any order. (Author) |
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| Enthalpy - Improved Dielectric Insulation for Superconducting Wires |
MAY 1982 |
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| Authors:
W. N. Lawless; C. F. Clark; R. W. Arenz; LAKE SHORE CRYOTRONICS INC WESTERVILLE OH
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| The purpose of this study was to investigate for the first time dielectric materials for enthalpy stabilization, the broad picture being that these materials would also serve as the dielectric-insulation coating. These new, inorganic materials resulted from basic research by the author into the specific heats of ferroelectric-type materials at low and glass which leads to enhanced specific-heat properties in several cases. In a particularly noteworthy case (60% SC-1C ceramic ... |
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| Relative Operating Capabilities of Selected Electric-Arc Reentry Environment Simulators |
SEP 1964 |
29 pages |
| Authors:
N. K. Hiester; C. F. Clark; STANFORD RESEARCH INST MENLO PARK CA
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| Stanford Research Institute has been engaged by National Aeronautics and Space Administration to determine the feasibility of developing meaningful standard evaluation procedures for testing ablating materials used in reentry- type thermal protection systems. This involves definition of the extent to which realistic environmental conditions are simulated by existing test devices, initiation of comparative tests on specific materials in several of these devices, and correlation and analysis of the results to ... |
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