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Dive into the research topics where E.G. Szklarz is active.

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Featured researches published by E.G. Szklarz.


Journal of The Less Common Metals | 1969

High-pressure synthesis of yttrium-thorium sesquicarbide: A new high-temperature superconductor☆

M.C. Krupka; A.L. Giorgi; N.H. Krikorian; E.G. Szklarz

Abstract A new, high-temperature superconductor, yttrium-thorium sesquicarbide, has been prepared by high-pressure-high-temperature techniques. The phase, crystallizing in the b.c.c., Pu2C3-type structure, exists over a wide ternary field. Lattice parameters are dependent on the Y Th metal and C M t carbon-total metal atomic ratios. The material is superconducting with a variable transition temperature, having a maximum at 17.0 °K. High-temperature ambient-pressure annealing results in the destruction of both the b.c.c. structure and the high-temperature superconductivity. A ternary b.c.t. phase, previously unreported, has been identified in a number of arc-melt preparations. This phase exists over a wide ternary field and is not superconducting down to 4 °K. Elements other than thorium have been incorporated in yttrium sesquicarbide with resultant enhancement of the superconducting temperature.


Journal of The Less Common Metals | 1969

HIGH PRESSURE SYNTHESIS AND SUPERCONDUCTING PROPERTIES OF YTTRIUM SESQUICARBIDE.

M.C. Krupka; A.L. Giorgi; N.H. Krikorian; E.G. Szklarz

Abstract The body-centered cubic Pu 2 C 3 -type structure of yttrium sesquicarbide, Y 2 C 3 , has been prepared in high yield by high pressure-high temperature techniques. Lattice parameter measurements indicate a homogeneity range for the compound. Magnetic susceptibility measurements show the material is superconducting over the entire homogeneity range with the superconducting transition temperature varying from a low of 6.0 °K to a high of 11.5 °K. High temperature-ambient pressure annealing of samples prepared by the high pressure-high temperature techniques destroyed the Pu 2 C 3 -type structure. No superconducting transition was observed on the annealed samples for measurements down to 2.0 °K.


Journal of The Less Common Metals | 1973

High pressure thorium-rare-earth carbide superconductors☆

M.C. Krupka; A.L. Giorgi; E.G. Szklarz

Abstract The high pressure preparation of superconducting thorium sesquicarbide permitted its use as a matrix whereby the effects of the addition of incremental quantities of rare-earth elements on the transition temperature could be studied. Thorium -rare-earth carbide superconducting solid solutions of general formula (Th, R.E.) 2 C 3 ( R . E .  Ho , Er , Lu as well as Sc ) have been synthesized under conditions of high pressure and high temperature. Transition temperatures of 4.1 to 11.7 K were observed and are dependent upon the rare-earth element and the thorium/rare-earth atomic ratio. The occurrence of superconductivity in these systems is limited by the thermodynamic stability of the superconducting phase and the conversion from the superconducting state to one of paramagnetism. Light rare-earth elements such as Ce, Pr, and Nd also form superconducting solid solutions but with depressed transition temperatures. The intermediate rare-earth elements Gd, Tb and Dy form magnetic solid solutions at the concentration levels investigated. The (Th,R.E.) 2 C 3 solid solutions crystallize in the body-centered cubic Pu 2 C 3 ( D 5 c ) structure.


Journal of The Less Common Metals | 1974

Evidence for ferromagnetism in alloys formed between uranium tetraboride and yttrium tetraboride

A.L. Giorgi; E.G. Szklarz; R.W. White; H.H. Hill

Experimental results are presented showing an apparent inducement of ferromagnetism in UB/sub 4/ by alloying this compound with nonmagnetic YB/sub 4/. The appearance of ferromagnetism in the UB/sub 4/- YB/sub 4/ alloy may be the result of an effective increase in the average U-U atom spacing in the lattice due to dilution by YB/sub 4/. (JRD)


Journal of The Less Common Metals | 1969

Preparation and superconductivity of germanium-stabilized Sc13C10☆

N.H. Krikorian; A.L. Giorgi; E.G. Szklarz; M.C. Krupka; B.T. Matthias

Abstract A new body-centered cubic scandium carbide phase having the approximate composition Sc13C10 has been prepared by high-temperature annealing of arc-melted samples containing small amounts of germanium. The lattice parameters of this new phase varied from a 0 = 8.514 A to a = 8.530 A suggesting a range of homogeneity. All compositions were found to be superconducting with the transition temperature ranging from 7.0 ° to 8.5 °K. Similar measurements on the previously reported Sc4C3 b.c.c. phase showed no superconducting transition for measurements down to 1 °K.


Journal of The Less Common Metals | 1987

Vaporization thermodynamics of Ni-B(liquid) and Ni-B-C(liquid)

E.K. Storms; E.G. Szklarz

Abstract The activity of nickel was measured as a function of composition and temperature throughout the Ni-B and Ni-B-C liquid range by the Knudsen effusion technique. Equations are given which describe thermodynamic properties as a function of composition and temperature. At 1600 K, the liquid phase exists between Ni0.922B0.078 and Ni0.473B0.527. Within this range the nickel activity drops from 1.0 to 0.0245. Dissolved carbon lowers the nickel activity and reduces the boron content of the high-boron phase boundary.


Journal of The Less Common Metals | 1987

Vaporization thermodynamics of Pd-B(Liquid) and Pd-B-C(Liquid)

E.K. Storms; E.G. Szklarz

Abstract The Pd-B and Pd-B-C liquid phases were studied by the Knudsen effusion technique to determine the variation of palladium and boron activity with composition and temperature. Equations are given which describe the thermodynamic properties throughout the liquid phase region. In addition, the phase boundary composition was determined between the liquid and the respective multiphase containing excess boron. The phase forms solid boron at 1600 K when the composition reaches Pd 0.55 B 0.45 and the palladium activity is 0.0186. Dissolved carbon causes the palladium activity to increase and the phase boundary to shift to a higher boron composition.


SUPERCONDUCTIVITY IN d‐ AND f‐ BAND METALS | 1972

Superconductivity of Various Ternary Thorium Compounds

A.L. Giorgi; E.G. Szklarz; M.C. Krupka

Superconductivity measurements have been made on the pseudo binary ThC/ThN system. The transition temperature (Tc) was found to increase from 3.2°K for the ThN phase to a maximum of 5.8°K at the composition ThC0.78N0.22 and then drop sharply as the composition approached the pure ThC. Using high‐pressure high‐temperature techniques, a thorium sesquicarbide phase crystallizing in the body‐centered‐cubic PU2C3− type structure was prepared and found to be superconducting with a Tc of 4.1°K. Ternary sesquicarbides with the general formula (Th1−xMx)C1.5 with M = Sc, Y, La, Lu, Er and Ho were also prepared. An increase in the Tc resulted in all cases. The highest Tc observed was 17.0°K and occurred in the yttrium‐thorium sesquicarbide system at the composition (Th0.3Y0.7)C1.55.


Archive | 1976

Pressure Dependence of Tc for Carbides of Thorium, Yttrium and Scandium

A.L. Giorgi; H.H. Hill; E.G. Szklarz; R.W. White

The effect of pressure on the Tc of Y2C3,Th2C3 and two ternary (ThxY1-x)2C3 alloys (all b.c.c. Pu2C3-type structure) was determined. Measurements were also made on the new superconducting germanium stabilized scandium carbide and on a germanium stabilized thorium- yttrium-carbide. The pure binary compounds exhibited negative values for the dTc/dP. Relatively strong positive pressure dependence was observed for the ternary compositions.


Journal of The Less Common Metals | 1987

Vaporization thermodynamics of PdAsx (liquid), Pd0.75(As1 − xBx)0.25 (liquid) and elemental arsenic

E.K. Storms; E.G. Szklarz

Abstract Liquid PdAsx, and Pd0.75(As1 − xBx)0.25 were studied by mass spectrometry combined with Knudsen effusion to determine the variation of arsenic and palladium activity with composition and temperature. Equations are given which describe the thermodynamic properties. At 1200 K, Pd0.75As0.25 is the congruently vaporizing composition and the high palladium phase limit is Pd0.79As0.21. The thermodynamic properties of the binary liquid are essentially unchanged by carbon or tungsten saturation. However, the activity of palladium in Pd(s) is lowered causing the liquid phase boundary to move to a higher arsenic composition. The Pd0.75(As1 − xBx)0.25 liquid has a positive deviation from ideality which indicates a repulsive energy between arsenic and boron in solution. The arsenic monomer pressure over elemental As(1) can be represented by log10P(atm) = −14846/T + 7.116 between 1400 K and 1700 K.

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A.L. Giorgi

Los Alamos National Laboratory

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M.C. Krupka

Los Alamos National Laboratory

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N.H. Krikorian

Los Alamos National Laboratory

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H.H. Hill

Los Alamos National Laboratory

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E.K. Storms

Los Alamos National Laboratory

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R.W. White

Los Alamos National Laboratory

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A.L. Gioiorgi

Los Alamos National Laboratory

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B.T. Matthias

University of California

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J.L. Smith

Los Alamos National Laboratory

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