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1.
O. I. Gyrdasova V. N. Krasil’nikov G. V. Bazuev L. Yu. Buldakova M. Yu. Yanchenko 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(8):1113-1116
A original method of synthesis of quasi-one-dimensional Ti1 − x
V
x
(OCH2CH2O)2 (0 ≤ x ≤ 0.13) and Zn1 − x
Co
x
(HCOO)(HOCH2CH2O) (0 ≤ x ≤ 0.3) has been developed. The synthesis products were used as a basis for nanoscale extended Ti1 − x
V
x
O2 and Zn1 − x
Co
x
O oxides. The compounds obtained and products of their thermolysis were investigated by X-ray diffraction, microscopy, IR
spectroscopy, thermogravimetry, and chemical analysis; the shape and size of particles were determined by scanning electron
microscopy. The good prospects of Ti1 − x
V
x
O2 and Zn1 − x
Co
x
O solid solutions as photocatalysts for hydroquinone oxidation are shown. 相似文献
2.
O. M. Fedorova A. M. Jankin L. B. Vedmid G. A. Dorogina I. A. Zvereva 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(8):1159-1160
The mechanisms of formation of NdSr2− x
Ca
x
Mn2O7 (0 ≤ x ≤ 2.0) solid solution have been studied. The dependence of its volume magnetic susceptibility on the calcium concentration
is obtained. The stability of this solid solution is compared with that of similar solid solutions in lanthanum-containing
systems. 相似文献
3.
4.
P. A. Popov P. P. Fedorov V. M. Reiterov E. A. Garibin A. A. Demidenko I. A. Mironov V. V. Osiko 《Doklady Physics》2012,57(3):97-99
The thermal conductivity of single crystals of Ca1 − x
Er
x
F2 + x
(x = 0.01, 0.05, 0.07, and 0.10) and Ca1 − x
Tm
x
F2 + x
(x = 0.02, 0.04, and 0.06) solid solutions is studied in the temperature ranges 50–300 and 298–673 K. With increasing content
of rare-earth elements, the behavior of thermal conductivity in these solid solutions changes from the characteristic of defect
single crystals to glasslike. The concentration dependences of thermal conductivity for the two systems differ insignificantly. 相似文献
5.
E. S. Zhukova N. P. Aksenov B. P. Gorshunov Yu. G. Selivanov I. I. Zasavitskii D. Wu M. Dressel 《Physics of the Solid State》2011,53(4):810-814
The spectra of epitaxial Pb1 − x
Eu
x
Te (0 ≤ x ≤ 0.37) solid solution layers grown on BaF2 and Si substrates have been investigated over a wide frequency range 7–4000 cm−1 at temperatures of 5–300 K. Apart from the phonon and impurity absorption lines, the absorption in a local mode in PbEuTe
layers of substrates and buffer layers has been observed in the frequency range 110–114 cm−1. As the temperature decreases from 300 to 5 K, the transverse phonon mode softens from 33.0 to 19.5 cm−1. 相似文献
6.
Deepika K. S. Rathore N. S. Saxena 《Applied Physics A: Materials Science & Processing》2010,98(2):441-448
Se58Ge42−x
Pb
x
(9≤x≤20) glasses have been prepared using conventional melt quenching technique. Differential Scanning Calorimetric (DSC) measurements
show single glass transition and double crystallization, which indicate the occurrence of phase separation in the samples.
The phases present in the samples were identified using XRD. The kinetics of the glass transition has been studied in terms
of the variation of glass transition temperature with composition and heating rate. In addition to this, activation energy
of the glass transition (E
t
) has also been evaluated and its composition dependence is also investigated. The thermal stability of these glasses has
been investigated using various stability criteria: Deiztal first glass criterion, ΔT, Saad and Poulain weighted thermal stability, H′ and the S-parameter. The values of these parameters were obtained using various characteristic temperatures such as the glass transition
temperature, T
g
, the onset temperature of crystallization, T
c
, and the peak crystallization temperature, T
p
. The values of stability parameters show that the phase corresponding to second crystallization is more stable than the phase
corresponding to first one. The stability in terms of the lead (Pb) content has been determined considering the values of
stability parameters of the phase corresponding to second peak. It was found that the stability increases with the lead content. 相似文献
7.
V. S. Rusakov N. I. Chistyakova I. A. Burkovsky A. M. Gapochka T. L. Evstigneeva 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(3):389-393
A M?ssbauer study of the structural and charge states of 57Fe and 119Sn atoms in the compounds of Cu3 −x
Fe
x
SnS4 and Cu2Fe1 − x
Zn
x
SnS4 systems was performed. It was shown that the iron atoms in the compounds of both systems were in the divalent and trivalent
states occupying the tetrahedral positions of the structure. The character of the changes of the degree of covalency of the
Fe2+-S, Fe3+-S and Sn4+-S bonds during the isomorphic substitution in the systems was established. 相似文献
8.
E. I. Lakhno E. I. Burmakin I. V. Korzun G. Sh. Shekhtman 《Physics of the Solid State》2012,54(3):504-507
The rubidium monoferrite RbFeO2-based solid solutions with the composition Rb2 − 2x
Fe2 − x
P
x
O4 have been synthesized, and their crystal structure and the temperature and concentration dependences of the total and electron
conductivities have been studied. The introduction of P5+ ions has been found to sharply decrease the electron conductivity that prevails in pure rubidium monoferrite and, at the
same time, to increase the ionic conductivity. The latter becomes dominant as the phosphorus concentration increases. The
maximum rubidium-cation conductivity of the materials under study is ∼3 × 10−2 S/cm at 300°C and ∼3 × 10−1 S/cm at 700°C. The results have been compared with the previously obtained data for similar solid solutions based on rubidium
monogallate and monoaluminate. 相似文献
9.
Jie Song Bing-Lin Hong Jun Zheng Pei Lin Ming-Sen Zheng Qi-Hui Wu Quan-Feng Dong Shi-Gang Sun 《Applied Physics A: Materials Science & Processing》2010,98(2):455-460
Ti-substituted LiMn2O4 (LiMn2−x
Ti
x
O4, x=0, 0.15, 0.30, 0.45, 0.60, and 0.75) has been synthesized using solid-state reactions. Their crystal and electronic structures
were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and ultraviolet photoelectron spectroscopy
(UPS). XRD data suggested that the lattice parameters of LiMn2−x
Ti
x
O4 increase due to the replacement of Mn by Ti ions. XPS results indicated that the substituted Ti ions were in +4 oxidation
state; consequently, the normal oxidation state of Mn ions has been detected by measuring the binding energy splitting of
Mn 3s states, which decreases with the content of substituted Ti. The valence band spectra suggested that the intensity of
e
g
level of Mn 3d orbitals increased due to the increase of the Mn3+/Mn4+ ratio. 相似文献
10.
A. A. Pavelko A. G. Lutokhin S. I. Raevskaya Yu. N. Zakharov M. A. Malitskaya I. P. Raevskii I. N. Zakharchenko E. I. Sitalo N. A. Korchagina V. G. Kuznetsov 《Bulletin of the Russian Academy of Sciences: Physics》2010,74(8):1104-1106
(1 − x)PbFe1/2Nb1/2O3−x
PbTiO3 (PFN-xPT) ferroelectric ceramics with low dielectric loss and pronounced anomalies of dielectric and pyroelectric properties near
the ferroelectric-ferroelectric phase transition was obtained by doping with lithium. The temperature dependence of the position
of the morphotropic boundary between the rhombohedral (monoclinic) and tetragonal phases in the x-T phase diagram of the PFN-xPT system was determined for the first time. 相似文献
11.
The e
+
e
− → π
+
π
−
π
+
π
− cross section is calculated for energies of 0.65 ≤ √s ≤ 1 GeV in the framework of the generalized hidden local symmetry model. The calculations are compared with the data of CMD-2
and BaBaR. It is shown that the inclusion of heavy isovector resonances ρ(1450) and ρ(1700) is necessary for reconciling calculations
with the data. It is found that, at √s ≈ 1 GeV, the contributions of the above resonances are much larger, by a factor of 30, than the ρ(770) one, and amount to
a considerable fraction ∼0.3–0.6 of the latter at √s ∼ m
ρ.
The text was submitted by the authors in English. 相似文献
12.
A. N. Georgobiani A. Kh. Matiyev S. V. Bulyarski T. A. Matiyeva 《Bulletin of the Russian Academy of Sciences: Physics》2008,72(10):1445-1447
The refractive index dispersion in β-Tl1 − x
Cu
x
InS2 (0 ≤ x ≤ 0.015) crystals has been studied using intrinsic interference. It is shown that these crystals are characterized by anomalous-dispersion
regions at wavelengths slightly exceeding those corresponding to exciton peaks. It is established that, using intrinsic interference,
one can detect excitons in these crystals at room temperature. Modulation of interference patterns is revealed, and explanation
of this phenomenon is proposed.
Original Russian Text ? A.N. Georgobiani, A.Kh. Matiyev, S.V. Bulyarski, T.A. Matiyeva, 2008, published in Izvestiya Rossiiskoi
Akademii Nauk. Seriya Fizicheskaya, 2008, Vol. 72, No. 10, pp. 1523–1525. 相似文献
13.
Yu. N. Zakharov A. A. Pavelko A. G. Lutokhin I. N. Andryushina V. Z. Borodin L. A. Reznichenko 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(8):1125-1127
The influence of thermostating at 450°C on the dielectric and pyroelectric properties of PbZr1 − x
Ti
x
O3 polarized ferroelectric specimens the range 0.02 ≤ x ≤ 0.05 has been investigated. An irreversible increase in the temperature of the ferroelectric-antiferroelectric phase transition
was observed in all specimens upon their cooling after exposure to an elevated temperature for more than 1 h. The original
position of the phase-transition point on the temperature scale was not recovered as a result of afterpoling upon cooling
through the Curie temperature. Heating of the same specimens in the bridged mode up to 650°C with subsequent abrupt immersion
in silicone oil at room temperature (hardening) is accompanied by an additional increase in the range of existence of the
antiferroelectric phase from 3 to 15°C with an increase in the x concentration. 相似文献
14.
A. I. Galyas O. F. Demidenko G. I. Makovetski? K. I. Yanushkevich L. I. Ryabinkina O. B. Romanova 《Physics of the Solid State》2010,52(4):687-690
Regions of the existence of sulfide Gd
x
Mn1 − x
S and selenide Ti
x
Mn1 − x
Se solid solutions have been identified. Their electrical and thermoelectric properties have been studied in the temperature
range 80–900 K. It has been established that the substitution of Gd2+ and Ti2+ ions for Mn2+ cations initiates reversal of the type of charge carrier with respect to the starting compounds MnS and MnSe. The cation
substitution in solid solutions brings about a change from the hole conduction (α > 0) characteristic of the manganese monosulfide
and monoselenide to the electronic conduction (α < 0). 相似文献
15.
A. N. Georgobiani A. Kh. Matiyev C. V. Bulyarski T. A. Matiyeva 《Bulletin of the Russian Academy of Sciences: Physics》2009,73(1):129-131
The IR reflection and Raman spectra of β-Tl1 − x
Cu
x
InS2 (0 ≤ x ≤ 0.015) single crystals have been studied in the temperature range 84–300 K. It is shown that partial replacement of thallium
by copper atoms leads to a decrease in the frequencies of the corresponding oscillations in the frequency range 40–500 cm−1 and does not induce (at given concentrations) local oscillations. Analysis of the transformation of the IR reflection spectra
at T
2 ≈ 185 K revealed a ferroelectric phase transition.
Original Russian Text ? A.N. Georgobiani, A.Kh. Matiyev, C.V. Bulyarski, T.A. Matiyeva, 2009, published in Izvestiya Rossiiskoi
Akademii Nauk. Seriya Fizicheskaya, 2009, Vol. 73, No. 1, pp. 138–140. 相似文献
16.
M. V. Gorev I. N. Flerov Ph. Sciau S. Guillemet-Fritsch 《Physics of the Solid State》2009,51(4):790-796
Deformation and the thermal expansion coefficient of ceramic samples of (Ba1 − x
La
x
)Ti1 − x/4O3 solid solutions (x = 0, 0.026, 0.036, 0.054) were studied in the temperature range 120–700 K. Based on an analysis of the data obtained, the
temperature-composition phase diagram is refined, and the temperature dependence of the polarization is calculated. The results
are discussed in combination with the dielectric measurement data.
Original Russian Text ? M.V. Gorev, I.N. Flerov, Ph. Sciau, S. Guillemet-Fritsch, 2009, published in Fizika Tverdogo Tela,
2009, Vol. 51, No. 4, pp. 746–752. 相似文献
17.
对A位掺杂的La1-xSrxFeO3-δ氧化物体系进行了低频内耗测量.研究发现此体系的内耗和模量-温度谱随Sr掺杂量(x)的不同而变化.当Sr含量x=0时,LaFeO3-δ体系的内耗和模量在测量温度范围内(-150—380℃)没有明显变化;而当x=0.2,0.25,1/3以及0.5时,掺杂样品均观察到一个与正交—三角相变对应的相变型内耗峰P1,且其峰温随x增加向低温移动.在x=0.25,1/3,0.5,0.6以及2/3的样品中还观察到一个弛豫型特征的内耗峰P2,此峰伴随着模量的变化,可归于畴壁的运动.进一步分析表明畴壁是受氧空位钉轧的.在x=0.5,0.6以及2/3样品的模量-温度谱上呈现出的模量急剧变化是与三角—立方铁弹性相变有关的.
关键词:
内耗
畴壁
钉扎
铁弹性相变 相似文献
18.
I. O. Troyanchuk A. N. Chobot N. V. Tereshko O. S. Mantytskaya E. A. Efimova 《Physics of the Solid State》2011,53(7):1340-1347
The magnetic and magnetotransport properties of Pr0.5Sr0.5Mn1 − x
Co
x
O3 (x ≤ 0.5) solid solutions have been investigated using neutron diffraction methods. The magnetization and electrical conductivity
have been measured in magnetic fields up to 140 kOe. It has been established that, during cooling in the temperature range
from 160 to 110 K, the compounds of compositions with a cobalt content x ≤ 0.07 undergo a structural phase transition from the high-temperature ferromagnetic phase to the antiferromagnetic phase.
A further substitution of cobalt for manganese leads to a stabilization of the inhomogeneous dielectric ferromagnetic state,
whereas a state of the cluster spin-glass type has been revealed in compositions with x = 0.15 and 0.20. At x ≥ 0.25, a new magnetic phase with a Curie temperature up to 210 K is formed as a result of the magnetic interaction between
manganese and cobalt ions. A magnetic phase diagram of the system under investigation has been constructed. 相似文献
19.
T. I. Krasnenko N. A. Zhuravlev L. A. Perelyaeva 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(3):371-373
The local structure of pyroanion groups in the incommensurate phase X-Zn2 − 2x
Cd2x
V2O7 (0.11 ≤ x ≤ 0.48) with a zero volumetric expansion coefficient is studied. Comparative analysis of IR and NMR spectra of samples in
the X-phase and of ZnCdV2O7 revealed that vanadium atoms have a similar structural and an identical charge environment. Additional bands in the IR spectra
of the X-phase in the range of end vibrations are due to the influence of the cation sublattice. 相似文献
20.
A. A. Kozlovskii V. F. Khirnyi A. V. Semenov V. M. Puzikov 《Physics of the Solid State》2011,53(4):707-716
The electrical conductivity and Seebeck effect in ceramics based on cobaltites Ho1 − x
Sr
x
CoO3 − δ (x = 0.65, 0.75, 0.85, 0.95) and Er1 − x
Sr
x
CoO3 − δ (x = 0.75, 0.85, 0.95) with a perovskite-like structure have been investigated in the temperature range T > 77 K. All the compounds under study are characterized by the variable-range-hopping conductivity with the temperature dependence
of the electrical resistivity corresponding to the Mott law. It has been found that, in the Ho0.35Sr0.65CoO3 − δ compound, thermally excited Co3+ ions contribute to the electrical conductivity with an increase in temperature to 250 K. The Seebeck coefficient of the systems
studied decreases as the strontium concentration and temperature increase. It has been shown that, for an adequate explanation
of this behavior, proper allowance must be made for the splitting of the 3d levels, as well as for the charge disproportionation of the cobalt ions. 相似文献