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  • 1
    Electronic Resource
    Electronic Resource
    Pyroelectric and dielectric properties of some light rare-earth orthochromites (1990)
    Springer
    Journal of materials science 1 (1990), S. 204-208 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The measurement of pyroelectic coefficient (p) and dielectric constant (K) of rare-earth orthochromites RCrO3, where R=praseodymium, neodymium, samarium, europium and gadolinium, have been reported in the temperature range 300 to 450 K. Pyroelectric data show that praseodymium and neodymium orthochromites do not have ferroelectric phase in this temperature range, whereas samarium, europium and gadolinium orthochromites are ferroelectric. The dielectric data support the above conclusion. Spontaneous polarization (P s) for samarium, europium and gadolinium have also been evaluated. The maximum values forP s are 4.6 × 10−3 C m−2 for SmCrO3, 0.42 C m−2 for EuCrO3 and 0.72 C m−2 for GdCrO3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696078
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical conduction in narrow band trivalent transition metal tungstates (1988)
    Springer
    Journal of materials science 23 (1988), S. 924-927 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The measurements of electrical conductivity (σ) and Seebeck coefficient (S) of trivalent transition metal tungstates M2(WO4)3 with M = Cr, Fe and Ni have been reported in the temperature range of 450 to 1250 K. The results have been explained on the basis of a schematic energy band diagram appropriate for these solids. The estimated value of the energy band gap is slightly more than 3 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153990
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical conduction in non-metallic rare-earth solids (1988)
    Springer
    Journal of materials science 23 (1988), S. 919-923 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Schematic energy band diagrams for the genesis of charge carriers in non-metallic rare-earth solids have been presented. It has been shown that positions of 4f bands have significant effect on the genesis and nature of charge carriers, their conduction mechanism and magnitude of electrical conductivity (σ) and Seebeck coefficient (S) of the solid. Relevant relations have been given for bothσ and S in different situations. Experimental data on rare-earth sesquioxides (R2O3), rare-earth tungstates [R2(WO4)3] and rare-earth molybdates [R2(MoO4)3] in the intrinsic range have been explained as examples for the validity of energy band diagrams.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01153989
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  • 4
    Electronic Resource
    Electronic Resource
    Electronic and ionic conduction in some simple lithium salts (1989)
    Springer
    Journal of materials science 24 (1989), S. 1159-1164 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical conductivity (σ) and thermoelectric power (S) of solidified melt samples of Li2MoO4, Li2WO4 and Li2SO4 are presented in the temperature range 415 K to melting point of each compound. The ratio of ionic to electronic contribution toσ has been obtained with the help of a time-dependence study of d.c. electrical conductivity. It has been shown that in Li2MoO4 electronic contribution toσ remains high up to its melting point (about 8% just below the melting point) and it shows no superionic phase. However, in Li2WO4 and Li2SO4 a superionic phase is obtained in which the ionic contribution toσ is more than 99.99%. However, in normal ionic (orα) phase it is small and decreases with decreasing temperature. Separate temperature variations of ionic (σ i) and electronic (σ e) conductivities are presented and the conduction mechanisms are discussed. It is shown that ionic conduction in theβ-phase is dominated by Schottky-type defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02397042
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  • 5
    Electronic Resource
    Electronic Resource
    Defects and electrical conduction in mixed lanthanum transition metal oxides (1988)
    Springer
    Journal of materials science 23 (1988), S. 1725-1728 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Lanthanum and transition metal mixed oxides form an interesting series of compounds with a general formula LaMO3 (with M = Ti, V, Mn, Cr, Co, Ni and Fe). These compounds have been investigated by many workers as regards to their various physical parameters including the electrical conductivity. The new data reported in this paper refer to the Seebeck coefficient (S) in the temperature interval 300 to 1250 K. Electrical conductivity as a function of temperature has also been reported in the same temperature range and this is quite consistent with the values reported in the literature. Using these and other relevant data reported in the literature it has been concluded that native defects are mainly responsible for the electrical conduction in these solids. The nature of defect centres, charge carrier and their electrical transport mechanism is briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01115712
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic and ionic conduction in some simple lithium salts (1989)
    Springer
    Journal of materials science 24 (1989), S. 1159-1164 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical conductivity (σ) and thermoelectric power (S) of solidified melt samples of Li2MoO4, Li2WO4 and Li2SO4 are presented in the temperature range 415 K to melting point of each compound. The ratio of ionic to electronic contribution toσ has been obtained with the help of a time-dependence study of d.c. electrical conductivity. It has been shown that in Li2MoO4 electronic contribution toσ remains high up to its melting point (about 8% just below the melting point) and it shows no superionic phase. However, in Li2WO4 and Li2SO4 a superionic phase is obtained in which the ionic contribution toσ is more than 99.99%. However, in normal ionic (orα) phase it is small and decreases with decreasing temperature. Separate temperature variations of ionic (σ i) and electronic (σ e) conductivities are presented and the conduction mechanisms are discussed. It is shown that ionic conduction in theβ-phase is dominated by Schottky-type defects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00553137
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  • 7
    Electronic Resource
    Electronic Resource
    Unusual magnetic behaviour of heavy rare earth vanadates at higher temperature (1983)
    Springer
    Journal of materials science 2 (1983), S. 744-746 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00720548
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  • 8
    Electronic Resource
    Electronic Resource
    Quasi-ferromagnetism in antiferromagnetic GdVO4 (1983)
    Springer
    Journal of materials science 2 (1983), S. 161-162 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00735565
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  • 9
    Electronic Resource
    Electronic Resource
    Electrical conduction in lithium molybdates (1986)
    Springer
    Journal of materials science 5 (1986), S. 785-786 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01730091
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  • 10
    Electronic Resource
    Electronic Resource
    Pyroelectric and dielectric properties of some heavy rare-earth orthochromites (1996)
    Springer
    Journal of materials science 7 (1996), S. 35-38 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The measurement of pyroelectric coefficient (p) and dielectric constant (K) of rare-earth orthochromites RCrO3, where R = Tb, Dy, Ho, Er and Yb are reported for the temperature range 300–600 K. Pyroelectric data show that all the studied orthochromites have ferroelectric phase in this temperature range. The dielectric data in some cases support this conclusion. Spontaneous polarization (P s) and Curie temperature (T c) have also been evaluated. The maximum value of P s varies from 0.041 Cm−2 to 0.30 Cm−2 in the studied orthochromites, which is very small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00194090
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