Synthesis, structure, and electric properties of oxygen-deficient perovskites Ba3In2ZrO8 and Ba4In2Zr2O11

Анимица, И. Е.; Dogodaeva, E. N.; Nokhrin, S. S.; Kosareva, O. A.; Neiman, A. Ya.

doi:10.1134/s1023193510070037

Cited by 16 publications

(4 citation statements)

References 18 publications

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“…The capability for reversible water uptake from the gas phase for undoped Ba 2 In 2 O 5 [18], Ba 4 In 2 Zr 2 O 11 [19], Ba 4 Ca 2 Nb 2 O 11 [20], all fluorine-doped [14,21], and chlorine-doped Ba 4 Ca 2 Nb 2 O 10.95 Cl 0.1 [13] samples was described earlier. It was proved that anionic doping (F À , Cl À ) leads to the decrease in the degree of hydration with the increase in the concentration of halide ions.…”

Section: Treatment Under Water Vapor Pressure ðPmentioning

confidence: 99%

Fluorine and chlorine doping in oxygen-deficient perovskites: A strategy for improving chemical stability

Tarasova

Анимица

2019

Comptes Rendus. Chimie

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Section: Treatment Under Water Vapor Pressure ðPmentioning

confidence: 99%

Fluorine and chlorine doping in oxygen-deficient perovskites: A strategy for improving chemical stability

Tarasova

Анимица

2019

Comptes Rendus. Chimie

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“…Исследования проводили на ИК фурье-спектрометре Nicolet 6700 в диапазоне частот от 400 до 4000 cm −1 методом диффузного отражения с использованием приставки Smart Diffuse Reflectance. [17]. Как видно, введение в кислородную подрешетку иона с меньшим радиусом (F − ) приводит к уменьшению параметров и объема ячейки, а введение иона с большим радиусом (Cl − ) -к увеличению параметров и объема…”

Section: экспериментальная частьunclassified

“…Для этих концентраций дефектов реализуется их статистическое расположение и, как следствие, высокие подвижности, поэтому фазы такого состава представляют интерес для исследования. В настоящей работе были получены фтор-и хлорзамещенные составы на основе кислород-дефицитного состава Ba 4 In 2 Zr 2 O 11 , ранее описанного как высокотемпературный протонный проводник [17]. Исследовано влияние природы галогенид-ионов на локальную структуру и процессы гидратации.…”

Section: Introductionunclassified

Локальная структура и процессы гидратации галогензамещенных перовскитов на основе Ba-=SUB=-4-=/SUB=-In-=SUB=-2-=/SUB=-Zr-=SUB=-2-=/SUB=-O-=SUB=-11-=/SUB=-

Тарасова¹,

Галишева²,

Анимица³

2019

Журнал Технической Физики

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Halogen-substituted perovskites Ba_4In_2Zr_2O_10.95F_0.1 and Ba_4In_2Zr_2O_10.95Cl_0.1 are synthesized, and their single-phase composition is verified by X-ray diffraction analysis. Their ability of the studied phases to hydrate and form energetically unequal OH^– groups is proved. It is found that introduction of halide ions leads to a decrease in the hydration degree with respect to the matrix composition, which is explained by a decrease in the crystal unit cell free volume Processes.

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“…Upon hydration, tetrahedra are transformed to octahedrons, in which OH − groups participate in the coordination of cations. These phases can uptake a significant quantity of water and show a dominant proton transport below 500-600 [9,[11][12][13][14][15][16][17], Ba 4 Ca 2 Ta 2 O 11 [18], Ba 4 Na 2 W 2 O 11 [19], Ba 2 InSnO 5.5 [20], Ba 2 YSnO 5.5 [21] and Ba 4 In 2 Zr 2 O 11 [22] are well known and well studied. Their structures have 8.33% vacant oxygen positions resulting from the combination of two types of cations in the B-sublattice in a 1:1 ratio.…”

Section: Introductionmentioning

confidence: 99%

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

et al. 2022

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This paper demonstrates the possibility of creating oxygen deficiency in perovskites A+3B+3O3 by introducing two types of cations with different charges into the B-sublattice. For this, it is proposed to introduce a two-charged cation, for example, Zn2+, as an alternative to alkaline earth metals. Previously, this possibility was demonstrated for aluminate LaAlO3 and indate LaInO3. In this article, we have focused on the modification of the scandium-containing perovskite LaScO3. The novel oxygen-deficient perovskite La2ScZnO5.5 and doped phases La1.9Ca0.1ScZnO5.45, La2Sc0.9Ca0.1ZnO5.45, and La2Sc0.9Mg0.1ZnO5.45 were obtained via a solid-state reaction process. Their phase composition and hydration were investigated by XRD and TGA + MS techniques. The conductivities of these materials were measured by the electrochemical impedance technique under atmospheres of various water vapor partial pressures. All phases crystallized in orthorhombic symmetry with the Pnma space group. The phases were capable of reversible water uptake; the proton concentration increased in the order of La2ScZnO5.5 < La2Sc0.9Mg0.1ZnO5.45 < La2Sc0.9Ca0.1ZnO5.45 ≈ La1.9Ca0.1ScZnO5.45 and reached ~90% hydration limit for Ca2+-doped phases. The total conductivities increased with the increase in the free lattice volume in the sequence of σLa2ScZnO5.5 < σLa2Sc0.9Mg0.1ZnO5.45 < σLa1.9Ca0.1ScZnO5.45 < σLa2Sc0.9Ca0.1ZnO5.45, the activation energy decreased in the same sequence. The sample La2Sc0.9Ca0.1ZnO5.45 showed the highest conductivity of about 10−3 S∙cm−1 at 650 °C (dry air pH2O = 3.5·10−5 atm). Water incorporation was accompanied by an increase in conductivity in wet air (pH2O = 2·10−2 atm) due to the appearance of proton conductivity. The sample La2Sc0.9Ca0.1ZnO5.45 showed a conductivity of about 10−5 S∙cm−1 at 350 °C (pH2O = 2·10−2 atm). A comparison of conductivities of obtained phase La2ScZnO5.5 with the conductivities of La2AlZnO5.5 and La2InZnO5.5 was made; the nature of the B-cation did not significantly affect the total conductivity.

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Synthesis, structure, and electric properties of oxygen-deficient perovskites Ba3In2ZrO8 and Ba4In2Zr2O11

Cited by 16 publications

References 18 publications

Fluorine and chlorine doping in oxygen-deficient perovskites: A strategy for improving chemical stability

Fluorine and chlorine doping in oxygen-deficient perovskites: A strategy for improving chemical stability

Локальная структура и процессы гидратации галогензамещенных перовскитов на основе Ba-=SUB=-4-=/SUB=-In-=SUB=-2-=/SUB=-Zr-=SUB=-2-=/SUB=-O-=SUB=-11-=/SUB=-

Crystal Structure, Electrical Conductivity and Hydration of the Novel Oxygen-Deficient Perovskite La2ScZnO5.5, Doped with MgO and CaO

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