Fizika Tverdogo Tela

Solid solutions (1-x)SrTiO 3-x PbZrO 3 (x=0.5, 0.6, 07, 0.8, 0.9) were synthesized and their dielectric properties are investigated Measurement of dielectric hysteresis loops allowed us to obtain field dependences of the main parameters characterizing the effect of energy storage in these materials. The relationship of the obtained parameters with the evolution of the state of solid solutions from relaxors to antiferroelectrcs in this system is discussed. Keywords: solid solutions, energy storage effect, relaxors, antiferroelectrcs.

None Smirnova E. P.

None Passet R. S.

None Sotnikova G. Yu.

None Zaitseva N. V.

None Guk E. G.

None Gavrilov G. A.

Физика твердого тела

Evolution of phase transitions and energy storage effect in SrTiO_3-PbZrO-=SUB=-3-=/SUB=- solid solutions

SrTiO_3-PbZrO_3固溶体中相变与储能效应的演变

Raman scattering spectra of linear carbon chains (carbines) localized in thin gold films of variable thickness are investigated. It is shown that the integral line is inhomogeneous, and separate components are identified, the intensity of which depends in a non-trivial way on the thickness of the film. Qualitative explanations of the detected effects are proposed. Keywords: carbine, linear allotropy of carbon, localization on clusters.

None Compan M. E.

None Konkov O. I.

None Nikitin S. E.

None Malyshkin V. G.

Features of Raman light scattering spectra in the 2100 cm-=SUP=--1-=/SUP=- line region by carbon formations in thin gradient gold films

薄梯度金膜中碳形成物在2100 cm-1线区域的拉曼光散射光谱特征

Within the framework of the full-potential method of augmented plane waves with local orbitals, the electronic structure and X-ray spectral characteristics of the semiconductor and metal phases of iron disilicide were calculated. The total and partial densities of electronic states, the band structure, and X-ray absorption spectra of the iron K-edge were calculated. The results are compared with the known experimental data. An explanation is given of the change in the X-ray absorption near edge structure during the transition from the semiconductor phase to the metallic one. Keywords: iron disilicide, electronic structure, APW+lo, method, XANES, K-edge.

None Potudanskii G.P.

None Kurganskii S.I.

Electronic structure and X-ray spectral characteristics of the semiconductor and metal phases of iron disilicide

二硅化铁半导体相和金属相的电子结构及X射线光谱特性

The lattice disorder of different architecture and dimensions influence on the thermoelectric properties (Seebeck coefficient S, resistivity rho, total thermal conductivity kappa tot ,, power factor S 2 /rho, figure of merit ZT) of the polycrystalline ternary sulfides MTS 3 was studied. The high-temperature misfit layered compounds (MS) z NbS 2 (MS is Gd x Dy 1-x S solid solutions) were chosen as objects of the study. The variation of gadolinium concentration along the series x=0.0, 0.1, 0.2, 0.5, 1.0 allowed one to alter the short-range and the long-range order of the crystal lattice and to study their effect on thermoelectric parameters of (Gd x Dy 1-x S) z NbS 2 . At low concentration of x=0.1 the crystallite size increases, cause the deformation stresses decrease and, thereby, leads to an abnormal changes of S, rho, kappa tot values and ZT decrease. An increase of the gadolinium concentration (x=0.2-0.5) alters the electronic structure and the interatomic bonding character of the incommensurate subsystems [Gd x Dy 1-x S] and [NbS 2 ]. In this case, S and rho values remains practically unaffected, while the thermal conductivity value decreases by 40% and ZT increases by 2 times. The nature of this phenomenon and the anisotropy of the thermoelectric properties were discussed. Keywords:: misfit layers compounds, thermoelectric properties, lattice disorder, solid solution, crystallite boundaries.

None Bakovets V. V.

None Sotnikov A. V.

The problems of increasing the thermoelectric figure of merit of polycrystalline misfit layered compounds on (Gd-=SUB=-x-=/SUB=-Dy-=SUB=-1-x-=/SUB=-S)-=SUB=-z-=/SUB=-NbS-=SUB=-2-=/SUB=- example

多晶错层化合物(Gd-=SUB=-x-=/SUB=-Dy-=SUB=-1-x-=/SUB=-S)-=SUB=-z-=/SUB=-NbS-=SUB=-2-=/SUB=-实例中热电优值提升的问题

The influence of small additional deformation by cold rolling (CR) on the microstructure and mechanical properties of ultrafine-grained (UFG) Al–0.4Zr alloy structured by high pressure torsion (HPT) has been studied. The results are compared with the application of small additional deformation by HPT, which, after low-temperature annealing, leads to a substantial increase in ductility (plasticization effect) with small decrease in strength. It is shown that, in contrast to the additional deformation of HPT, the deformation of CR after intermediate low-temperature annealing leads to a sharp drop in plasticity to ~2%, while the strength increases to ~275 MPa. The key role of the nonequilibrium state of grain boundaries in the manifestation of the plasticization effect in the UFG Al–0.4Zr alloy is revealed. A new approach is proposed for simultaneously increasing the strength and ductility of the UFG Al–0.4Zr alloy due to a small additional deformation by CR without intermediate annealing. As a result of this approach, a significant increase in strength by ~30% (ultimate tensile strength ~223 MPa) was achieved with a simultaneous increase in ductility up to ~26%, which is associated with an increase in the strain hardening rate due to an increase in the density of lattice dislocations in the UFG structure with nonequilibrium grain boundaries. The strain rate sensitivity and strain hardening coefficients have been determined for the UFG Al–0.4Zr alloy in various states.

А.М. Мавлютов

Т.С. Орлова

М.Ю. Мурашкин

Н.А. Еникеев

Влияние состояния границ зерен на эффект пластификации в ультрамелкозернистом сплаве Al-0.4Zr

晶界状态对Al-0.4Zr超细晶合金塑化效应的影响

出版信息	出版商: Nauka Publishers，出版周期: ，期刊类型: journal，开源期刊: 否
基本数据	创刊年份: 1998，原创研究文献占比: ，自引率:， Gold OA占比:

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Evolution of phase transitions and energy storage effect in SrTiO_3-PbZrO-=SUB=-3-=/SUB=- solid solutions

Features of Raman light scattering spectra in the 2100 cm-=SUP=--1-=/SUP=- line region by carbon formations in thin gradient gold films

Electronic structure and X-ray spectral characteristics of the semiconductor and metal phases of iron disilicide

The problems of increasing the thermoelectric figure of merit of polycrystalline misfit layered compounds on (Gd-=SUB=-x-=/SUB=-Dy-=SUB=-1-x-=/SUB=-S)-=SUB=-z-=/SUB=-NbS-=SUB=-2-=/SUB=- example

Влияние состояния границ зерен на эффект пластификации в ультрамелкозернистом сплаве Al-0.4Zr

Evolution of phase transitions and energy storage effect in SrTiO_3-PbZrO-=SUB=-3-=/SUB=- solid solutions

Features of Raman light scattering spectra in the 2100 cm-=SUP=--1-=/SUP=- line region by carbon formations in thin gradient gold films

Electronic structure and X-ray spectral characteristics of the semiconductor and metal phases of iron disilicide

The problems of increasing the thermoelectric figure of merit of polycrystalline misfit layered compounds on (Gd-=SUB=-x-=/SUB=-Dy-=SUB=-1-x-=/SUB=-S)-=SUB=-z-=/SUB=-NbS-=SUB=-2-=/SUB=- example

Влияние состояния границ зерен на эффект пластификации в ультрамелкозернистом сплаве Al-0.4Zr