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Ya. V. Baklanova N. A. Zhuravlev L. G. Maximova T. A. Denisova O. N. Leonidova A. A. Raskovalov N. V. Tarakina 《Bulletin of the Russian Academy of Sciences: Physics》2014,78(4):320-322
Complex lithium metallates Li2 Me x Zr1 ? x O3 ? δ (Me = Nb, Ti, x = 0.05, 0.1) with iso-and heterovalent substitutions for Zr4+ ions in lithium zirconate are synthesized for the first time using a citrate technique. The inclusion of Ti4+ and Nb5+ ions in the crystal structure of Li2ZrO3 is confirmed by means of X-ray diffraction and NMR. It is shown that in the temperature range of 750–820 K, Li2Ti0.1Zr0.9O3 solid solution has higher conductivity than phases of undoped lithium zirconate. 相似文献
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Marwène Oumezzine Octavio Peña Sami Kallel Nabil Kallel Thierry Guizouarn Francis Gouttefangeas Mohamed Oumezzine 《Applied Physics A: Materials Science & Processing》2014,114(3):819-828
The effects of non-magnetic Ti4+ substitution on the structural, electrical and magnetic properties of La0.67Ba0.33Mn1?x Ti x O3 (0≤x≤0.1) are investigated and compared to those existing in La0.67Ba0.33Mn1?x Cr x O3 (magnetic Cr3+). The structural refinement by the Rietveld method revealed that Ti-doped samples crystallize in the cubic lattice with space group $\mathrm{Pm}\bar{3}\mathrm{m}$ , while samples with Cr crystallize in the hexagonal setting of the rhombohedral $\mathrm{R}\bar{3}\mathrm{C}$ space group for identical contents of dopant. The most relevant structural features are an increase of the lattice parameters, of the cell volume and of the inter-ionic distances with increasing Ti doping level. Both series of samples show a decrease of the paramagnetic–ferromagnetic transition temperature when the amount of chromium or titanium increases. Transport measurements show that when increasing the metal doping, the resistivity increases whereas the metallic behavior of the parent compound La0.67Ba0.33MnO3 is destroyed. For a substitution higher than 5 at.% of Ti and 10 at.% of Cr, the samples exhibit a semiconducting behavior in the whole range of temperature, for which the electronic transport can be explained by variable range hopping and/or small polaron hopping models. 相似文献
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L. S. Smirnov I. Natkaniec A. B. Belushkin D. Smith M. Prager 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2009,3(6):847-856
Neutron scattering is used to study the structure and dynamics of Me1 − x
(NH4)
x
SCN (Me = K, Rb) mixed crystals along the concentration section of 0.0 < x < 1.0 at room temperature 10 and 290 K. Phase transitions in Me1 − x
(NH4)
x
SCN mixed crystals are analyzed by neutron powder diffraction. The measured spectra of inelastic incoherent neutron scattering
from mixed crystals in a concentration range of 0.0 < x < 1.0 at 10 are transformed into the generalized phonon density of states G(E) in the one-phonon incoherent approximation. Using G(E), we determine the changes in ammonium ion dynamics during phase transitions. Low energy resonance and local translational
(two bands) and librational (two bands) modes are observed in the disordered rhombic phase at 10 K. The low energy resonance
mode is not found in the ordered monoclinic phase at 10 K, though the local translational mode in the form of two bands and
the local librational mode in the form of four bands are present there. The low energy resonance mode appears due to hybridization
of the phonon spectrum of the host crystal with rotational tunneling modes of the split librational ground state of the impurity’s
molecular ammonium ion. 相似文献
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, Bi2Te3–x
Se
x
. , , . , , . .
Influence of oxygen content on electric and thermoelectric properties of ternary system Bi2Te3–x Se x
A study is made of the influence of oxygen, contained in the semi-conducting system Bi2Te3–x Sé x , on the electric and thermoelectric properties. It is shown that the addition of oxygen to the prepared samples Bi2Te2.4Se0.6 causes a decrease in electric conductivity while the thermoelectric force remains unchanged. This influence is connected with a decrease in the mobility of the electrons but their concentration is not influenced by the presence of oxygen. Conclusions are reached as to the influence of oxygen on the efficiency of the conversion of thermal energy into electric energy and vice versa.相似文献
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The results of the investigation of the quadratic electro-optic effect in Sr1–x Ca x TiO3 with x = 0.014 (SCT) and in nominally pure SrTiO3 (STO) at room temperature in applied direct-current (dc) and alternating-current (ac) electric fields have been presented. It has been shown that the quadratic (in polarization) electro-optic coefficients of STO and SCT crystals coincide within the accuracy of the determination (±5%). It has been found that, in nominally pure STO measured in a dc electric field, there is a relaxation of the electro-optic effect with a relaxation time τ ≈ 30 s due to the formation of a space charge in the sample. No similar effect in SCT has been observed. A possible mechanism for the formation of a space charge in STO and SCT has been discussed. 相似文献
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J. Rosseel 《Physics of Particles and Nuclei》2012,43(5):646-648
Critical gravities originated in the context of three-dimensional massive gravities. They were conjectured to describe gravitational duals of two-dimensional logarithmic conformal field theories. In this talk, we show that critical gravities can also be studied in dimensions d > 3. As in three dimensions, higher-dimensional critical gravities exhibit logarithmic modes. We argue that the existence of these logarithmic modes leads one to conjecture that higher-dimensional critical gravities are dual to logarithmic conformal field theories in more than two dimensions. 相似文献
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用多组态自洽场方法,结合我们提出的半经验拟合公式,对40≤Z≤44类镍离子3d94s,3d94p,3d94d态的能级进行计算,根据能级拟合值算出s-p,p-d跃迁的谱线波长,并给出各谱线的HFR振子强度. 相似文献
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A. M. Gorbatov A. V. Germanov D. V. Nechaev P. V. Komarov P. Yu. Nikishov 《Physics of Atomic Nuclei》2000,63(3):431-439
A collective adiabatic approach is used to explore the total and differential cross sections for the reactions d + d → p + 3H and d + d → n + 3He at incident-deuteron energies of up to 6 MeV. All substantially contributing partial waves of order not higher than that of G waves are taken into account. The experimental value of the difference of the cross sections for the above mirror reactions is reproduced theoretically under the assumption that nuclear forces obey the condition of isotopic invariance. The positions and amplitudes of the maxima in the calculated total cross sections virtually coincide with those of the corresponding experimental values. It is shown that, around the maxima of the cross sections under study, dominant contributions to them come from the P wave. The sensitivity of observables to the parameters of nucleon-nucleon interaction is analyzed. 相似文献
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用多组态自洽场方法,结合我们提出的半经验拟合公式,计算了高离化态类钴Pd19+离子3p63d9-3p53d10,3p63d9-3p83d84p跃迁和振子强度,并与实验符合得较好。 相似文献
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用多组态自洽场方法,结合提出的半经验拟合公式,计算了高离化态类钴Rh^18 离子3p^63d^9—3p^53d^10,3p^63d^9—3p^63d^84p跃迁和振子强度,并与实验进行了比较. 相似文献
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用多组态相对论理论对ZnⅩⅨ离子3s2,3s3p,3p2,3s3d,3p3d,3d2,3s4s,3s4p,3s4f组态能级结构进行了计算与分析.在已有实验工作的基础上,运用参数拟合方法计算了ZnⅩⅨ离子上述组态能级,获得了能级结构参数的最佳计算值.由这些参数值进一步预测计算了ZnⅩⅨ离子n=3Complex中3d2-3p3d组态能级跃迁的谱线波长,振子强度和跃迁概率. 相似文献
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The hyperfine magnetic field at 111Cd impurities substituting iron in the mixed spinels Cd
x
Fe3−x
O4 and Zn
x
Fe3−x
O4 has been determined by means of the Perturbed Angular Correlation technique. Compounds with different concentrations x were investigated as a function of temperature. The possibility of determining the lattice location of probes at octahedral
or tetrahedral sites through the magnitude of the electric field gradient is analyzed. The measured hyperfine magnetic field
at impurities in tetrahedral sites is discussed in terms of the populations of magnetic ions in the nearest neighbor sites.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
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The SeCu 1 m x Zn x O 3 solid solution, with a distorted perovskite-type structure, has been synthesized under high pressures and temperatures. X-ray diffraction analysis indicates that the zinc ions occupy the copper sites, a solid solution being formed. It seems that high-pressure stabilises a small cation such as Se 4+ in the A site of the perovskite structure ABO 3 although the material is better described as formed by selenite anions \rm{SeO}_{3}^{-} and Cu 2+ /Zn 2+ cations. 相似文献
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Kallaev S. N. Omarov Z. M. Mitarov R. G. Bilalov B. R. Kurbaitaev A. Ya. Khasbulatov S. V. Reznichenko L. A. 《Physics of the Solid State》2017,59(7):1477-1480
Physics of the Solid State - The heat capacity of multiferroics Bi1–x Pr x FeO3 (0 ≤ x ≤ 0.20) has been studied in the temperature range 130–800 K. An insignificant... 相似文献