Structural Phase Transitions in YBaCo4O7 + x Cobaltate upon Variations in Oxygen Content, According to X-Ray Diffraction Data obtained Using Synchrotron Radiation
Научная публикация
| Общая информация |
Язык:
Английский,
Жанр:
Статья (Full article),
Статус опубликования:
Опубликована,
Оригинальность:
Переводная
|
| Журнал |
Bulletin of the Russian Academy of Sciences: Physics
ISSN: 1062-8738
, E-ISSN: 1934-9432
|
| Вых. Данные |
Год: 2013,
Том: 77,
Номер: 2,
Страницы: 151-154
Страниц
: 4
DOI:
10.3103/S1062873813020044
|
| Ключевые слова |
Oxygen Content; Terahertz Radiation; Kagome Lattice; Rhombic Distortion; Initial Oxygen Content |
| Авторы |
Alekseev A.V.
1
,
Kameneva M.Yu.
1
,
Kozeeva L.P.
1
,
Lavrov A.N.
1
,
Podberezskaya N.V.
1
,
Smolentsev A.I.
1
,
Shmakov A.N.
2
|
| Организации |
| 1 |
Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia
|
| 2 |
Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090, Russia
|
|
Информация о финансировании (4)
|
1
|
Российский фонд фундаментальных исследований
|
10-02-00532
|
|
2
|
Российский фонд фундаментальных исследований
|
10-02-01005
|
|
3
|
Сибирское отделение Российской академии наук
|
53
|
|
4
|
Министерство образования и науки Российской Федерации
|
|
According to thermogravimetric data, the equilibrium oxygen content in layered YBaCo4O7 + x cobaltate varies stepwise from x ≈ 1.4 to x ≈ 0 when temperature is varied in the range of 300–400°C. Detailed ex situ and in situ structural investigations using synchrotron radiation show that variation in the oxygen content in YBaCo4O7 + x is accompanied by substantial reordering of the crystal structure and has the character of a first-order phase transition between two rigorously determined phases that differ by the parameters and symmetry of the crystal lattice as well as by the oxygen content. In addition to uniquely high oxygen liberation upon heating, dx/dT, great mechanical stresses that lead to the material cracking and complicate its practical use are a consequence of the character of stepwise transitions in YBaCo4O7 + x .