| 000 | 04983nlm1a2200457 4500 | ||
|---|---|---|---|
| 001 | 646313 | ||
| 005 | 20231030040723.0 | ||
| 035 | _a(RuTPU)RU\TPU\network\11449 | ||
| 035 | _aRU\TPU\network\4158 | ||
| 090 | _a646313 | ||
| 100 | _a20160220a2012 k y0engy50 ba | ||
| 101 | 0 | _aeng | |
| 102 | _aNL | ||
| 135 | _adrnn ---uucaa | ||
| 181 | 0 | _ai | |
| 182 | 0 | _ab | |
| 200 | 1 |
_aInvestigation of structural states and oxidation processesin Li0.5Fe2.5O42d using TG analysis _fA. P. Surzhikov [et al.] |
|
| 203 |
_aText _celectronic |
||
| 300 | _aTitle screen | ||
| 320 | _a[References: p. 1211-1212 (21 tit.)] | ||
| 330 | _aUsing the methods of X-ray phase and DSC analyses, a correlation is established between ordering/ disordering of the structure of lithium pentaferrite (LPF-Li0.5Fe2.5O4-d) and its nonstoichiometry with respect to oxygen. Ferrite specimens with a reduced content of oxygen were prepared by thermal annealing in vacuum (P = 2 9 10-4 mmHg). It is shown that this treatment results in oxygen nonstoichiometry and causes a transition of LPF into a state with random distribution of cations in the crystal lattice. Using nonisothermal thermogravimetry (TG), the kinetic dependences of oxygen absorption by the aniondeficient LPF are investigated within the temperature interval T = (350-640) _C in the course of its oxidation annealing in air. The kinetic experiment data are processed with the Netzsch Thermokinetics software. The oxidation rate constants, the effective coefficients, and the activation energy of oxygen diffusion in the material under study are derived. Their values are in a satisfactory agreement with those earlier obtained for the lithium-titanium ferrite ceramic material of the following composition: Li0.649 Fe1.598Ti0.5Zn0.2Mn0.051O4-d. The effective activation energy of oxygen diffusion in LPF calculated within the temperature interval T = (350-640) _C is found to be Ed = 1.88 eV. In its value, it is close to the activation energy of oxygen diffusion along grain-boundaries in the lithium-titanium ferrite ceramic material. | ||
| 333 | _aРежим доступа: по договору с организацией-держателем ресурса | ||
| 461 | _tJournal of Thermal Analysis and Calorimetry | ||
| 463 |
_tVol. 108, iss. 3 _v[P. 1603-1609] _d2012 |
||
| 610 | 1 | _aэлектронный ресурс | |
| 610 | 1 | _aтруды учёных ТПУ | |
| 610 | 1 | _alithium pentaferrite | |
| 610 | 1 | _aoxygen nonstoichiometry | |
| 610 | 1 | _aenergy | |
| 610 | 1 | _adiffusion | |
| 701 | 1 |
_aSurzhikov _bA. P. _cSpecialist in the field of high voltage electrical engineering, solid state physics _cProfessor of TPU, doctor of physical and mathematical sciences (DSc) _f1951- _gAnatoly Petrovich _2stltpush _3(RuTPU)RU\TPU\pers\30237 |
|
| 701 | 1 |
_aFrangulyan (Franguljyan) _bТ. S. _cspecialist in the field of electronics, dielectrics and semiconductors _cleading researcher of Tomsk Polytechnic University, candidate of physical and mathematical Sciences _f1940- _gTamara Semenovna _2stltpush _3(RuTPU)RU\TPU\pers\33975 |
|
| 701 | 1 |
_aFrangulyan (Franguljyan) _bТ. S. _cspecialist in the field of electronics, dielectrics and semiconductors _cleading researcher of Tomsk Polytechnic University, candidate of physical and mathematical Sciences _f1940- _gTamara Semenovna _2stltpush _3(RuTPU)RU\TPU\pers\33975 |
|
| 701 | 1 |
_aVasiljev _bI. P. _ca specialist in the field of electrical engineering _cassistant researcher of Tomsk Polytechnic University _f1990- _gIvan Petrovich _2stltpush _3(RuTPU)RU\TPU\pers\33976 |
|
| 701 | 1 |
_aLysenko _bE. N. _cSpecialist in the field of electrical engineering _cHead of the laboratory of Tomsk Polytechnic University, Candidate of physical and mathematical sciences _f1972- _gElena Nikolaevna _2stltpush _3(RuTPU)RU\TPU\pers\32050 |
|
| 701 | 1 |
_aGyngazov (Ghyngazov) _bS. A. _cspecialist in the field of electronics _cLeading researcher of Tomsk Polytechnic University, Doctor of technical sciences _f1958- _gSergey Anatolievich _2stltpush _3(RuTPU)RU\TPU\pers\33279 |
|
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет (ТПУ) _bИнститут неразрушающего контроля (ИНК) _bПроблемная научно-исследовательская лаборатория электроники, диэлектриков и полупроводников (ПНИЛ ЭДиП) _h194 _2stltpush _3(RuTPU)RU\TPU\col\19033 |
| 712 | 0 | 2 |
_aНациональный исследовательский Томский политехнический университет (ТПУ) _bИнститут неразрушающего контроля (ИНК) _bКафедра физических методов и приборов контроля качества (ФМПК) _h68 _2stltpush _3(RuTPU)RU\TPU\col\18709 |
| 801 | 2 |
_aRU _b63413507 _c20160226 _gRCR |
|
| 856 | 4 | _uhttp://dx.doi.org/10.1007/s10973-011-1734-z | |
| 942 | _cCF | ||