Nano‐ and microcrystals of doped niobates

Mielewczyk‐Gryń, Aleksandra; Gdula, Karolina; Lendze, T.; Kusz, B.; Gazda, Maria

doi:10.1002/crat.201000378

Cited by 14 publications

(13 citation statements)

References 21 publications

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“…Ã and Acc ½ : The TG data presented in Fig. 8 show weak temperature dependency, and from previous studies for calcium-doped lanthanum orthoniobate, there is no indication of any phase segregation with temperature [23,25]. As calcium has a stable 2?…”

Section: Resultssupporting

confidence: 50%

Water uptake analysis of acceptor-doped lanthanum orthoniobates

Mielewczyk‐Gryń

Wachowski

Prześniak-Welenc

et al. 2019

J Therm Anal Calorim

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In this work, lanthanum orthoniobates doped with either antimony, calcium, or both have been synthesized and studied. The water uptake of the investigated materials has been analyzed by means of thermogravimetric studies. The results show the difference between the thermodynamics of hydration between the lanthanum orthoniobate system and other proton conducting ceramics. The relation between the water uptake and effective acceptor doping for the investigated system has been found, and the energetics of the water uptake relation are discussed.

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Section: Resultssupporting

confidence: 50%

Water uptake analysis of acceptor-doped lanthanum orthoniobates

Mielewczyk‐Gryń

Wachowski

Prześniak-Welenc

et al. 2019

J Therm Anal Calorim

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“…The LMNO agglomerates are quite large; their size reaches approximately 10 µm. This fact is in agreement with previous studies of sintered LMNO samples published elsewhere which proved that in the case of sintered samples prepared from MSS powders grains tend to agglomerate [11]. On the other hand the CTF grains are not so strongly agglomerated and have average sizes of 3-5 µm.…”

Section: Resultssupporting

confidence: 93%

“…The La 0 98 Mg 0 02 NbO 4 powder was prepared by the molten salt synthesis method (MSS) which was described elsewhere [11]. In order to produce composite samples the powders of CTF and LMNO were mixed in weight ratio 1:1 and then milled in an agate mortar.…”

Section: Methodsmentioning

confidence: 99%

Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite

et al. 2013

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Abstract:A composite of CaTi 0 9 Fe 0 1 O 3 and electrolyte material, i.e. magnesium doped La 0 98 Mg 0 02 NbO 4 was prepared and studied. The phase content and the sample microstructure was examined by an X-ray diffraction method and scanning electron microscopy. EDS measurements were done both for composite samples and the diffusion couple. The electrical properties were studied by four terminal DC method. The hightemperature interaction between the two components of the composite has been observed. It has been suggested that lanthanum diffused into the perovskite phase and substituted for calcium whereas calcium and niobium formed the Ca 2 Nb 2 O 7 pyrochlore phase. At 1500℃ very large crystallites of the pyrochlore were observed. Regardless of strong interaction between the composite components, its total conductivity was weakly dependent on the sintering temperature. PACS

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“…The 021 and 040 reflections were chosen for detailed analysis because the first one is the strongest peak for LaNbO 4 while the other corresponds to this crystal direction along which the fast crystal growth has been observed before. 15 Table II presents widths (FWHM) of these reflections for the samples prepared in different conditions.…”

Section: Lanthanum Niobatementioning

confidence: 99%

“…13 14 Our previous investigation has shown that also selected proton conducting oxides can be successfully synthesized by MSS method. For example, magnesium-doped lanthanum niobate 15 and yttrium-doped barium cerate 16 obtained with the molten salt synthesis have been studied.…”

Section: Introductionmentioning

confidence: 99%

Proton Conducting Ceramic Powder Synthesis by a Low Temperature Method

Gazda¹,

Mielewczyk‐Gryń²,

Gdula-Kasica³

et al. 2015

j nanosci nanotechnol

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Molten salt synthesis (MSS) is a simple method for the preparation of ceramic powders with specific morphology. The main role of the molten salts is to increase the reaction rate and lower the reaction temperature. It occurs because of much higher mobility of reactants in the liquid medium than in the solid state. In this work the molten salt synthesis was applied to produce ceramic powders of La0.995Ca0.005NbO4 and BaCe(0.9-x)Zr(x)Y0.1O3. Single-phase lanthanum niobate formed in all studied conditions of the synthesis, whereas in the case of barium cerate-zirconate MSS led to forming two crystalline phases: barium cerate and barium zirconate. The heating temperature and time as well as the salt content most strongly influenced the shape and size of particles. The influence of other parameters on the powder morphology was weaker. Despite differences in size and morphology, all groups of the La0.995Ca0.005NbO4 powder obtained with the MSS method pressed into pellets and sintered gave a dense ceramic material. On the other hand in the case of barium cerate-zirconate regardless of synthesis and sintering conditions the ceramics were porous.

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Nano‐ and microcrystals of doped niobates

Cited by 14 publications

References 21 publications

Water uptake analysis of acceptor-doped lanthanum orthoniobates

Water uptake analysis of acceptor-doped lanthanum orthoniobates

Characterization of CaTi0.9Fe0.1O3/La0.98Mg0.02NbO4 composite

Proton Conducting Ceramic Powder Synthesis by a Low Temperature Method

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