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20220104090510.0 |
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861021s1984 xx a bm 000 0 eng d |
| 035 |
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|9 ADK7074AM
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|a (OCoLC)14449967
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| 035 |
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|a (OCoLC)ocm14449967
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|a TXA
|b eng
|c TXA
|d OCLCQ
|d OCLCG
|d OCLCQ
|d OCLCF
|d OCLCQ
|d OCLCO
|d TXA
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| 049 |
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|a TXAM
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| 099 |
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|a 1984
|a Dissertation
|a D352
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| 100 |
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|a Delgado, Rolando
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| 245 |
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|a The thermoelectric power of Ca₁xAlx, Ca₆₀Al₄₀y Gay and La₁xAlx metallic glasses.
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| 264 |
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|c 1984.
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| 300 |
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|a xii, 109 leaves :
|b illustrations ;
|c 29 cm
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| 336 |
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|a text
|b txt
|2 rdacontent
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| 337 |
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|a unmediated
|b n
|2 rdamedia
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| 338 |
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|a volume
|b nc
|2 rdacarrier
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| 500 |
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|a "Major subject: Physics."
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| 500 |
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|a Typescript (photocopy).
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| 500 |
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|a Vita.
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| 502 |
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|b Ph. D. in Philosophy
|c Texas A & M University
|d 1984
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| 504 |
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|a Includes bibliographical references (leaves 103-108).
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|a The thermopower, S, and normalized resistance, R(T)/R(,o), as a function of temperature of some Ca(,1-x)Al(,x), .20 < x < .45, Ca(,.60)Al(,.40-y)Ga(,y), y = .10 and .20, and La(,1-x)Al(,x), .18 < x < .35 metallic glasses have been measured. It is found that the temperature coefficient of resistivity, (alpha) = (rho)('-1)d(rho)/dT, for all the samples is negative and the thermopower is positive for the Ca(,1-x)Al(,x) and Ca(,.60)Al(,.40-y)Ga(,y) alloys while it is negative for the La(,1-x)Al(,x) alloys. The thermopower and resistivity of the Ca(,.55)Al(,.45), Ca(,.60)Al(,.40) and both Ca-Al-Ga alloys are anomalously high. The value of 502 (mu)(OMEGA)-cm and 32 (eta)V/K('2) for the Ca(,.60)Al(,.20)Ga(,.20) alloy are the largest reported room temperature value of (rho) and S/T, respectively, of any non-magnetic amorphous alloy. The value of S/T for the Ca(,1-x)Al(,x) alloys with x = .30, .33, .40 and .45 increase steadily as the temperature decreases and exhibit a small shoulder like structure at approximately 50 K. Below this temperature S/T increases much more rapidly and reaches a maximum value at very low temperatures. This type of temperature dependence in S/T is also observed in both Ca-Al-Ga alloys with the exception that the shoulder like structure is much less pronounced. The value of S/T for the La(,1-x)Al(,x) alloys remains relatively constant at high temperatures, ((theta)(,D) < T < 300 K). However, below (theta)(,D), the value of S/T exhibits a smooth and rapid increase as the temperature decreases and reaches a maximum value just before the onset of superconductivity. The observed temperature dependence of the thermopower at low temperatures, (T < (theta)(,D)), may be understood in terms of the electron-phonon mass enhancement. Neither the Ziman-Faber diffraction model nor the Mott s-d scattering model are able to explain the magnitude and compositional dependence of the thermopower and resistivity of these three alloy systems.
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|a Metallic glasses.
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| 650 |
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|a Thermoelectricity.
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| 650 |
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|a Physics
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| 655 |
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|a Academic theses
|2 lcgft
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| 700 |
1 |
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|a Adair, T. W.,
|e degree committee member.
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| 700 |
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|a Fry, Edward S.,
|e degree committee member.
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| 700 |
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|a Martinez, J. E.,
|e degree committee member.
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| 700 |
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|a Naugle, Donald G.,
|e degree supervisor.
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| 710 |
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|a Texas A & M University,
|e degree granting institution.
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| 856 |
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|u http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=751346141&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD
|z Link to ProQuest Copy
|t 0
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| 856 |
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|u https://hdl.handle.net/1969.1/DISSERTATIONS-778341
|z Link to OAKTrust copy
|t 0
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| 994 |
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|a C0
|b TXA
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| 999 |
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|i a8e42695-0326-3625-9e3f-5a53b473ab8e
|t 0
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| 952 |
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|p noncirc
|a Texas A&M University
|b J.J. Pickle Campus
|c High Density Repository
|s HDR
|d Remote Storage
|t 0
|e 1984 Dissertation D352
|h Other scheme
|i unmediated -- volume
|m A14841015786
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| 952 |
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|a Texas A&M University
|b College Station
|c Electronic Resources
|s www_evans
|d Available Online
|t 0
|e 1984 Dissertation D352
|h Other scheme
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| 998 |
f |
f |
|a 1984 Dissertation D352
|t 0
|l Available Online
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| 998 |
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f |
|a 1984 Dissertation D352
|t 0
|l Remote Storage
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