Thermoelectric Power of Ce Impurity in Cubic Crystalline Field at Low Temperatures

1987 ◽  
Vol 26 (S3-1) ◽  
pp. 499 ◽  
Author(s):  
Norio Kawakami ◽  
Ayao Okiji
Keyword(s):  
Thermoelectric Power ◽  
Low Temperatures ◽  
Crystalline Field

scholarly journals The principal magnetic susceptibilities of neodymium sulphate octahydrate at low temperatures

1939 ◽  
Vol 170 (941) ◽  
pp. 266-271 ◽  
Keyword(s):  
Low Temperatures ◽  
Room Temperature ◽  
Energy Levels ◽  
Constant Factor ◽  
The Other ◽  
Crystalline Field ◽  
Cubic Symmetry ◽  
The Subject ◽  
The Difference ◽  
The One

The magnetic and other related properties of neodymium sulphate have been the subject of numerous investigations in recent years, but there is still a remarkable conflict of evidence on all the essential points. The two available determinations of the susceptibility of the powdered salt at low temperatures, those of Gorter and de Haas (1931) from 290 to 14° K and of Selwood (1933) from 343 to 83° K both fit the expression X ( T + 45) = constant over the range of temperature common to both, but the constants are not the same and the susceptibilities at room temperature differ by 11%. The fact that the two sets of results can be converted the one into the other by multiplying throughout by a constant factor suggested that the difference in the observed susceptibilities was due to some error of calibration. It could, however, also be due to the different purity of the samples examined though the explanation of the occurrence of the constant factor is then by no means obvious. From their analysis of the absorption spectrum of crystals of neodymium sulphate octahydrate Spedding and others (1937) conclude that the crystalline field around the Nd+++ ion is predominantly cubic in character since they find three energy levels at 0, 77 and 260 cm. -1 .* Calculations of the susceptibility from these levels reproduce Selwood’s value at room temperature but give no agreement with the observations-at other temperatures. On the other hand, Penney and Schlapp (1932) have shown that Gorter and de Haas’s results fit well on the curve calculated for a crystalline field of cubic symmetry and such a strength that the resultant three levels lie at 0, 238 and 834 cm. -1 , an overall spacing almost three times as great as Spedding’s.

Thermoelectric Power of Germanium at Low Temperatures

1955 ◽  
Vol 97 (6) ◽  
pp. 1721-1722 ◽  
Author(s):  
E. Mooser ◽  
S. B. Woods
Keyword(s):  
Thermoelectric Power ◽  
Low Temperatures

171. Thermoelectric power of graphites at low temperatures

Carbon ◽  
1969 ◽  
Vol 7 (6) ◽  
pp. 735
Author(s):  
T Tsuzuku ◽  
T Takezawa ◽  
A Ono
Keyword(s):  
Thermoelectric Power ◽  
Low Temperatures

Enhancement of thermoelectric power factor in CrSi2 film via Si:B addition

2015 ◽  
Vol 29 (27) ◽  
pp. 1550189
Author(s):  
Q. R. Hou ◽  
B. F. Gu ◽  
Y. B. Chen
Keyword(s):  
Electrical Resistivity ◽  
Thermoelectric Power ◽  
Raman Spectra ◽  
Power Factor ◽  
Low Temperatures ◽  
X Ray Diffraction ◽  
Thermoelectric Power Factor ◽  
X Ray ◽  
Large Enhancement ◽  
Diffraction Patterns

In this paper, we report a large enhancement in the thermoelectric power factor in CrSi2 film via Si:B (1 at.% B content) addition. The Si:B-enriched CrSi2 films are prepared by co-sputtering CrSi2 and heavily B-doped Si targets. Both X-ray diffraction patterns and Raman spectra confirm the formation of the crystalline phase CrSi2. Raman spectra also indicate the crystallization of the added Si:B. With the addition of Si:B, the electrical resistivity [Formula: see text] decreases especially at low temperatures while the Seebeck coefficient [Formula: see text] increases above 533 K. As a result, the thermoelectric power factor, [Formula: see text], is greatly enhanced and can reach [Formula: see text] at 583 K, which is much larger than that of the pure CrSi2 film.

scholarly journals Magnetic and transport properties of stainless steels at low temperature

2017 ◽  
Vol 23 (3) ◽  
pp. 257 ◽  
Author(s):  
Katsuhiko Nishimura ◽  
Takahiro Namiki ◽  
Tsuyoshi Ikeno ◽  
Yuichi Yamamoto ◽  
Wayne D. Hutchison
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Transport Properties ◽  
Thermoelectric Power ◽  
Stainless Steels ◽  
Low Temperatures ◽  
Martensite Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cold Rolled

<p class="AMSmaintext1"><span lang="EN-GB">Magnetic and transport properties of cold rolled SUS304 stainless steels were investigated via measurements of X-ray diffraction, magnetization, thermoelectric power (TEP), thermal conductivity and electrical resistivity from 300 K down to low temperatures.   Saturation magnetizations at 300 K were 1.6, 37.5, 72.6 and 105.6 emu/g for rolled thickness reduction ratios of 0, 33, 50 and 75%, respectively.  The thermoelectric power (TEP) values at 300 K were found to be -1.3, -0.4, 1.6 and 2.9 </span><span lang="EN-GB">m</span><span lang="EN-GB">V/K for the reduction ratios of 0, 33, 50 and 75%, respectively.  Least-squares fits of the experimental data predicted a saturation magnetization of 141 emu/g and a thermoelectric power of 4.3 </span><span lang="EN-GB">m</span><span lang="EN-GB">V/K for SUS304 in the martensite phase at 300 K.</span></p>

The direct measurement of the magnetization entropy of a paramagnetic substance: thermal and magnetic properties of ferric methylammonium alum at low temperatures

1961 ◽  
Vol 262 (1308) ◽  
pp. 110-119 ◽  
Keyword(s):  
Magnetic Properties ◽  
Direct Measurement ◽  
Ground State ◽  
Low Temperatures ◽  
Experimental Error ◽  
Energy Levels ◽  
Ferric Ions ◽  
Crystalline Field ◽  
The Absolute ◽  
Paramagnetic Substance

A method, is described for determining the magnetization entropy of a paramagnetic sub­stance by the measurement of the heat absorbed by the sample during isothermal demagnet­izations near 1°K. The method has been used with ferric methylammonium alum, which deviates appreciably from ideal behaviour because of the large Stark splittings of the ground state of the Fe 3+ ions. The results were found to agree within the experimental error with magnetization entropies computed from the energy levels of the ferric ions in a trigonal crystalline field. The computed entropies have been used to determine the absolute tem­peratures below 1°K reached by adiabatic demagnetizations of this salt.

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