Glycine-nitrate Combustion Method Research Articles

Optimizing oxygen ion conductivity by modulating crystalline homogeneity

Keeping the stoichiometry at the optimal value required for electrical conduction throughout polycrystalline ceramics is crucial for various polycrystalline oxygen ion conductors. Using the photoluminescence spectrum of Eu3+ as a structural probe, the dependence between composition uniformity and conductivity was confirmed. We found that, for apatite La9.67×0.99Eu9.67×0.01Si6O26.505 (LSO) oxygen ion conductors synthesized by glycine nitrate combustion method, higher glycine content enhances the La/Si ratio uniformity, thereby improving the bulk conductivity. Surprisingly, thermal diffusion even at 1550°C cannot achieve uniform distribution when the precursor materials are not sufficiently homogeneous. Slight non-uniformity in the La/Si ratio is beneficial for impurities aggregation at high-density grain boundary regions, thereby alleviating the blocking effect of grain boundary on oxygen ion conduction. Both the bulk and total conductivities are higher than the best reported values in polycrystalline apatite by optimizing the La/Si ratio uniformity. The insight gained in this work is beneficial for enhancing conductivity by modulating crystalline homogeneity, and it facilitates further enhancement of ionic conductivity through cations doping for various polycrystalline oxygen ion conductors.

Investigation of samarium and neodymium co-doped BaCeO3 electrolyte for proton-conducting solid oxide fuel cells

BaCe0.8Sm0.2-xNdxO3-δ (x = 0, 0.05, 0.1, 0.15) powder was prepared using the glycine-nitrate combustion method, its crystal structure, microscopic morphology and electrochemical properties were investigated. X-ray diffraction analysis showed that the BaCe0.8Sm0.2-xNdxO3-δ powder with orthorhombic perovskite structure could be obtained after calcined at 1150 °C. Scanning electron microscopy showed that BaCe0.8Sm0.2-xNdxO3-δ sintered samples exhibited a dense structure. Electrochemical impedance tests showed that the substitution of Nd3+ improved the electrical conductivity of the BaCeO3-based electrolyte materials. The proton conductivity of BaCe0.8Sm0.15Nd0.05O3-δ samples reaches a maximum value of 0.035 S cm−1 in a wet air environment at 700 °C.

Lattice-free volume dependent electrical property modulation in A-site doped lanthanum aluminate solid electrolyte

The optimization of lattice-free volume and lattice symmetry distortion improves the ionic conductivity of the perovskite materials. Here, we report the correlation between structural and electrical properties of A-site substituted monovalent metal cations (Li+, Na+, K+) with various concentrations (10 %, 20 %, and 30 %) in LaAlO3 solid electrolytes synthesized by the glycine-nitrate combustion method. The formation of hexagonal LaAlO3 was confirmed by X-ray diffraction and the maximum internal lattice expansion was observed with the concentrations of 10 % Li+, 10 % Na+, and 20 % K+- doping in LaAlO3. Among the monovalent cations, 10 % of Na-doped LaAlO3 exhibited the highest conductivity, as the ionic radius of Na+(1.39 Å) is close to La3+ (1.36 Å). This substitution minimally distorts the lattice and thus provides more free volume for migration, which was further confirmed by XPS analysis. The maximum enhancement of conductivity of more than an order of 3 magnitudes was observed for monovalent doped LaAlO3 than the pure sample. Our results highlight the increase in conductivity of monovalent doped LaAlO3 in the order of Na+ > Li+ > K+. The results demonstrated that Na-doped LaAlO3 can be a good electrolyte material for intermediate temperature oxide ion conducting solid oxide fuel cells.

Effect of Calcination Temperature on the Structural and Electrochemical Behaviour of Li-Based Cathode for Intermediate-Temperature SOFC Application

A new strategy to reduce the operating temperature of the solid oxide fuel cell (SOFC) is needed to foster the progress of developing high-performance and stable SOFC as a solution to the thermal stress and degradation of the cell components induced by high-temperature SOFC. The use of lithium (Li) as a cathode can increase the cell’s efficiency, as it allows for faster ion transport and a higher reaction rate. This study presents an attractive approach to using a Li-based cathode by combining Li with cobalt (Co) to form LiCo0.6Sr0.4O2 (LCSO). In this work, a precursor consisting of Li, Co, and strontium (Sr) was prepared via the glycine-nitrate combustion method. The precursor was calcined at two different calcination temperatures (800 and 900 °C) prior to ink formulation and symmetrical cell fabrication in order to study the effect of calcination temperature on the structural and electrochemical behaviour of a Li-based cathode. The precursor LCSO powder was characterised using X-ray crystallography (XRD) to determine the crystal structure and composition of the developed LCSO. The electrochemical performance of the fabricated symmetrical cell was tested using electrochemical impedance spectroscopy (EIS) to obtain the cell’s resistance information, which is related to the cell’s ionic and electronic conductivity. SDC electrolyte with LCSO calcined at 800 °C has a higher crystallinity percentage and a more porous structure compared to LCSO calcined at 900 °C. The porous structure enhanced the electrochemical performance of the cell, where the symmetrical cell has the highest conductivity (0.038 Scm−1) with the lowest activation energy (0.43 eV). The symmetrical cell was also able to achieve 2.89 Ω cm2 of area-specific resistance (ASR) at 800 °C of operating temperature. In conclusion, the SDC electrolyte with LCSO calcined at 800 °C is the promising cathode material for SOFC applications. The result of this study can benefit the SOFC field of research, especially in the development of intermediate temperature-SOFC.

The effect of Ho-doping on the synthesis, structure and magnetic characteristics of ZnFe2O4-based nanopowders

The successful production of nanopowders consisting of Ho-doped zinc ferrite (ZnFe2-xHoxO4, with x values ranging from 0 to 0.08) has been accomplished using the glycine-nitrate combustion (GNC) method, followed by calcination in air. Various analytical techniques, such as EDXS, DTA-TG, SEM, PXRD, Raman spectroscopy, and vibrating sample magnetometry (VSM), were employed to examine the resulting samples. The outcomes of our investigation indicated that an excess of fuel during the GNC process yields X-ray amorphous foamy products, which subsequently crystallize after being held at a temperature of 550 °C for a duration of 4 h. PXRD data analysis showed that the obtained samples consist of single-phase Ho-doped zinc ferrite with a spinel structure. The incorporation of holmium into the ferrite spinel structure was established to occur when the calcination temperature is elevated to 700 °C. Rietveld refinement revealed that the degree of inversion varies from 0.078 to 0.309 as the level of Ho-doping increases from x = 0 to x = 0.08. Furthermore, the incorporation of Ho leads to a more than twofold reduction in the crystallite size of ZnFe2-xHoxO4, decreasing from 61.7 to 27.3 nm. The magnetic properties of the nanopowders are shown to be systematically altered by changes in the degree of inversion and the crystallite size of zinc ferrite, which are interrelated with the holmium content. For instance, the saturation magnetization (Ms) increases by 20% and attains a value of 54.9 kOe at x = 0.08. This finding suggests that the magnetic behavior of ZnFe2–xHoxO4 nanoparticles can be deliberately adjusted, making them a promising candidate for functional materials in the field of magnetic hyperthermia. In summary, this research provides valuable insights into the synthesis, structure, and magnetic properties of Ho-doped zinc ferrite nanopowders, underscoring their potential applications in the realm of magnetic hyperthermia.

Effect of ZnO on the intermediate-temperature electrochemical properties of Gd0.1Ln0.1Ce0.8O2-α (Ln = Er, Yb) for solid oxide membrane fuel cells

In this study, Gd0.1Ln0.1Ce0.8O2-α (Ln = Er, Yb) was prepared by a glycine-nitrate combustion method. The influences of the calcining temperature, codoped ion and addition of sintering additive on the structures, grain sizes and intermediate-temperature electrochemical properties of the samples were investigated. The micromorphologies and crystal structures of the synthesized samples were analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The relationship between the conductivity and oxygen partial pressure and the H2/O2 fuel cell was also studied. The XRD results showed that the samples were single-phase cubic fluorite structures after being calcined at 1350 °C and 1450 °C. The sintering additive of ZnO can significantly affect the morphology and density of the obtained ceria electrolytes. The conductivities of 1350-GEDC-ZnO and 1350-GYDC-ZnO reached 4.4 × 10−2 S cm−1 and 3.4 × 10−2 S cm−1 at 750 °C, respectively. The output performance of the intermediate-temperature thin film fuel cell was also studied by applying the electrolyte with the best electrical property. The maximum output power densities of the 1350-GEDC-ZnO membrane (15 μm) using Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) as the cathode were 296.2 mW cm−2, 406.2 mW cm−2 and 529.1 mW cm−2 at 650 °C, 700 °C and 750 °C, respectively.

Influence of A-Site Deficiency and B-Site Composition on the Electrical and Crystallographic Properties of (La0.25Sr0.25Ca0.45)yTi0.95Ni0.05-xMnxO3-δ Solid Oxide Fuel Cell Anode

In this work, we studied the effect of A-site deficiency and B-site chemical composition on electrical performance of (La0.25Sr0.25Ca0.45)yTi0.95Ni0.05-xMnxO3-δ (x=0-0.05) (y=1, 0.9474) (LSCTNM-x) fuel electrode. The doped compositions were successfully synthesized by the glycine-nitrate combustion method and then characterized by XRD and SEM to confirm the phase purity and visualize the microstructure of studied electrode layers. Furthermore, the DC four-probe conductivity measurements of porous electrode layers has been done to understand the impact of MIEC material composition on electrical conductivities of LSCTNM. Conductivities have been measured at two different atmospheres: 1% H2 + 1.7% H2O + 97.3% Ar and 98.3% H2 + 1.7% H2O. Results of this study demonstrate that the conductivity is considerably dependent on composition and the LSCTNM materials with 10% A-site deficiency showed the maximal total electrical conductivity of porous electrode layers in 98.3% H2 + 1.7% H2O atmosphere.

One-step highly selective catalytic oxidation of cyclohexane to KA-oil over functional CeMn0.5Co0.5Ox composite oxide: Synergistic effects between Mn and Co species with different valences and metal ion ratios

Presently, one-step highly selective oxidation of cyclohexane to KA-oil, which is a crucial organic chemical intermediate for the production of ε-caprolactam and adipic acid, is still a tremendous challenge. In this work, the functional CeMn0.5Co0.5Ox composite oxide catalysts were successfully prepared by glycine-nitrate combustion method. The results showed that 93.0% of selectivity to KA-oil with 4.6% of cyclohexane conversion was achieved over CeMn0.5Co0.5Ox under the optimal reaction conditions. The experimental and characterization results showed that the excellent catalytic performance of CeMn0.5Co0.5Ox is attributed to the synergistic effects between Mn and Co species with different valences and metal ion ratios, which efficiently promote the directional decomposition or reduction of cyclohexyl hydroperoxide (CHHP) intermediate to KA-oil. The density functional theory (DFT) calculations further confirmed the synergistic catalysis of CeMn0.5Co0.5Ox in the selective oxidation. This work affords the new insights into the design of efficient catalyst for the selective oxidation of alkanes.

Luminescence and protonic conduction of Eu3+ doped BaCeO3 perovskite synthesized by glycine-nitrate combustion method

The Eu3+ doped barium cerate had been made using the Glycine nitrate combustion technique. The prepared powder's characterization reveals that it is made entirely of orthorhombic nanopowder that has been crystallized. The generated nanopowder's emission spectra were used to calculate the Judd-Ofelt parameter intensities, which confirmed that the added Eu3+ replaced the Ce4+ in the perovskite structure and that it was positioned in the 4b, non-centrosymmetric Wyckoff position. By using complex impedance spectroscopy, the produced nanopowder's electric characteristics were investigated in the temperature range of 480–650 °C (CIS). The obtained doped barium cerate has an unusual activation energy (0.28 eV between 562 and 650 °C) and conductivity of 2673 10−5 Ω−1 cm−1 at 650 °C in the temperature range under consideration.

Synthesis of Ruddlesden-Popper LaSrFe1-Cr O4 phases (x = 0.0, 0.2, 0.4, 0.6) by glycine-nitrate combustion process: Effect of Cr doping on magnetic, optical and photocatalytic properties

This work presents the study of new Ruddlesden-Popper phases, LaSrFe 1- x Cr x O 4 ( x = 0.0, 0.2, 0.4 and 0.6), synthesized by glycine-nitrate combustion method. In this research, we are for the first time reporting on a complete Ruddlesden-Popper series ( n = 1) for the photocatalytic degradation of a dye. The effect of Cr 3+ doping on the crystal structure, optical and magnetic properties of the LaSrFeO 4 phase has also been systematically explored via different characterization techniques. Rietveld refinement of PXRD data indicates the formation of single phase compounds with tetragonal symmetry in the space group I 4/ mmm . The results show a decrease in the lattice parameters a and c , as well as the unit cell volume V , with increase in Cr 3+ doping. The energy band gap ( E g ) values calculated using the DRS spectra decreases with increase in Cr concentration. The magnetic measurements revealed dominant anti-ferromagnetic (AFM) interactions in all the phases and the appearance of weak ferromagnetic (FM) interactions with Cr 3+ doping. The results are discussed by considering the increase in Fe 3+ ─O─Cr 3+ FM interaction in addition to the Fe 3+ ─O─Fe 3+ and Cr 3+ ─O─Cr 3+ AFM super-exchange interactions induced due to random distribution of Fe 3+ and Cr 3+ ions at the octahedral site. Rhodamine B, as a dye pollutant model, was used for evaluation of photocatalytic activity of the prepared phases. Enhanced photocatalytic activity was observed with the addition of Cr 3+ substitution. The results show ~99 % degradation for x = 0.6 while only ~76 % degradation is shown for x = 0.0 sample in 40 min under visible light irradiation. • New RP-type LaSrFe 1- x Cr x O 4 phases synthesized by glycine-nitrate combustion method. • E g values decreased with increase in Cr concentration. • Dominant AFM interactions in all the phases and the appearance of weak FM interactions with Cr doping. • Enhanced photocatalytic activity was observed by Cr doping.

Phase composition, microstructure, and microwave dielectric properties of Nd[(Zn0.925Co0.075)1/2Ti1/2]O3 derived from glycine–nitrate combustion method

Phase composition, microstructure, and microwave dielectric properties of Nd[(Zn0.925Co0.075)1/2Ti1/2]O3 derived from glycine–nitrate combustion method

Elevated electrochemical activity of double perovskites PrBaCo2-xNixO6-δ towards hydrogen peroxide oxidation

The complex oxides with the ordered perovskite-like structure were carefully examined as enzyme-free electrochemical sensors with a stable and sensitive response to the hydrogen peroxide for the first time. The ordered perovskites PrBaCo2O6-δ (PBC) and PrBaCo1.9Ni0.1O6-δ (PBCN) were synthesized by glycine-nitrate combustion method and characterized by means of XRD, SEM and XPS. Thermogravimetry and iodometric titration were implemented to evaluate the average oxidation states of B-site transition metals and the oxygen non-stoichiometry. Electrochemical properties of double perovskites towards H2O2 were comprehensively studied by a combination of cyclic voltammetry and chronoamperometry in an alkaline media. The PBCN-based electrode is shown to possess a considerable sensitivity (1078.31 μA cm−2 mM−1) with a suitable detection limit and linear range. In addition, the influence of more oxidized forms of B-site cations, oxygen vacancies, and diffusion coefficient values at peroxide electrocatalytic properties were discussed.

Effect of sintering temperature on the transport properties of La2Ce2O7 ceramic materials

La2Ce2O7 (LCO) based materials are of a paramount importance since they can be utilized for ammonium production, thermal barrier application, catalysts, hydrogen production and solid oxide fuel cells (SOFCs). In this work, a nano crystalline LCO powder was prepared using glycine-nitrate combustion method and then its properties were comprehensively characterized. The structural analysis of the synthesized LCO was carried out using conventional X-ray diffraction (XRD) and Raman spectroscopy. In a disordered phase, LCO is a biphasic mixture composed of C- and F-type phases. Densification studies were performed by sintering LCO pellets at different sintering temperatures. A densification of ≥95% was observed in all the samples with a very little variation. Sintering temperature had a marked effect on the electrical conductivity of LCO. The LCO sintered at 1100 °C showed the highest conductivity (3.68 mS/cm at 700 °C in air). The electrical conductivity was found to be decreasing with an increase in sintering temperature from 1100 to 1400 °C. To understand the behavior, the analysis of distribution function of relaxation times (DFRTs) utilized for correct separation of grain and grain boundary resistances. The presence of C- and F- type phases calculated from Raman spectra plays a crucial role in deciding conduction behavior of LCO. The results suggest a strong relationship between history of the ceramics preparation and their electrical properties.

Synthesis, structure, and photo-Fenton activity of PrFeO3-TiO2 mesoporous nanocomposites

Porous nanocomposites based on PrFeO3-TiO2 were synthesized using the glycine-nitrate combustion method with different values of mass content of TiO2 (0–7.5 %) and subsequent heat treatment in air. The results of X-ray phase analysis and Raman spectroscopy confirmed the presence of ultradispersed TiO2, structurally close to that of anatase. The morphology, specific surface area, and porous structure of the obtained powders were characterized by scanning electron microscopy and adsorption-structural analysis, the results of which showed that the samples had a foam-like mesoporous structure.The specific surface area and the average pore size were in the ranges of 7.6–17.8 m2/g and 7.2–15.2 nm, respectively, and varied depending on the TiO2 content. The optical properties of the nanocomposites were studied by UV-visible diffuse reflection spectroscopy, the energy of the band gap was calculated as 2.11–2.26 eV. The photocatalytic activity of PrFeO3‑TiO2 nanocomposites was investigated in the process of photo-Fenton-like degradation of methyl violet under the action of visible light. It was shown that the maximum reaction rate constant was 0.095 min-1, which is ten times higher than the value for the known orthoferrite-based analogs. The obtained photocatalysts were also characterized by their high cyclic stability. Based on the studies carried out, the obtained porous PrFeO3-TiO2 nanocomposites can be considered to be apromising basis for photocatalysts applied in advanced oxidative processes of aqueous media purification from organic pollutants.

La1-xCaxFeO3-δ air electrode fabricated by glycine-nitrate combustion method for solid oxide electrolysis cell

As a new type of energy conversion device, solid oxide electrolysis cell (SOEC) has attracted much attention in recent years because of its advantages such as high efficiency and unlimited capacity. At present, SOEC mainly has such issues as the element diffusion or delamination at oxygen electrode/electrolyte interface under high oxygen partial pressure, which limits its operation lifetime. In this paper, La1-xCaxFeO3-δ materials without Sr and Co were prepared by glycine-nitrate combustion method as SOEC oxygen electrodes. It is found that La0.6Ca0.4FeO3-δ (LCF64) has excellent electrical conductivity and has a coefficient of thermal expansion matching with SSZ electrolyte. The hydrogen electrode supported single cells with structure of LCF64-GDC (6:4) | GDC | SSZ | NiO-SSZ active layer | NiO-YSZ transition layer | NiO-YSZ supported layer were prepared by tape casting and co-firing method showed good electrochemical performance in SOEC mode. The electrolysis current density is 457.46 mA cm-2 with 60% H2O-H2 atmosphere and 1.3 V applied voltage at 800 °C. During the constant voltage (1.3V) electrolysis process, the SOEC showed an acceptable stable current density of approximate 280 mA cm-2 for more than 60 h.

Processing of perovskite La0.9Sr0.1Ga0.8Mg0.2O3-δ electrolyte by glycine-nitrate combustion method

The doped LaGaO3 is a well-known intermediate-temperature electrolyte due to its high ionic conductivity and negligible electronic conductivity. However, the phase pure La0.9Sr0.1Ga0.8Mg0.2O3-δ (LSGM 9182) compound is not easy to be prepared because of its sensitive character with preparing process. In this work, the influence of evaporating temperature (glycine-nitrate combustion method) on the phase formation and physical property of LSGM 9182 is investigated systematically. The samples with different evaporating temperature 80 °C ≤ T ˂ 84 °C, 84 °C ≤ T ˂ 88 °C, 88 °C ≤ T ˂ 92 °C and T ≥ 92 °C was named as compound A, B, C and D. XRD results show that the phase pure compound can only be synthesized with the evaporating temperature 80 °C ≤ T ˂ 84 °C, the higher evaporating temperature, the higher content of LaSrGaO4 or LaSrGa3O7 impurity. Due to the slight change in composition, shoulders and splitting of some XRD reflections in phase pure compound A disappear for compound D, representing an transition from low-symmetry orthorhombic lattice to high-symmetry cubic lattice. Owing to the competiting contribution between crystal symmetry and impurity, the conductivity of compound D does not decrease almostly at low temperature, however, the influence of low conductive LaSrGaO4 prevails at high temperature, consequently, the conductivity of compound D decreases to a large degree at 800 °C. Above results suggest that evaporating temperature is an important parameter to prepare high quality LSGM electrolyte, suitable evaporating temperature supplies proper energy for chemical reaction and produce single perovskite phase compound finally.

A promising strontium and cobalt-free air electrode Pr1-xCaxFeO3-δ for solid oxide electrolysis cell

A promising strontium and cobalt-free ferrite Pr1-xCaxFeO3-δ (PCF, x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) has been synthesized successfully by glycine-nitrate combustion method and used as the air electrode of solid oxide electrolysis cell (SOEC) for steam electrolysis. The crystal structure and electricity conductivity of PCF are investigated in detail. According to the conductivity test, Pr0.6Ca0.4FeO3-δ (PCF64) with higher conductivity is selected as the air electrode to preparing the single cell with structure of PCF64|GDC|SSZ|YSZ-NiO. Under SOFC mode, the maximum power density of the single cell is 462.93 mW cm−2 at 800 °C with hydrogen as fuel. Under SOEC mode, the current density reaches 277.14 mA cm−2 and the corresponding hydrogen production rates is 115.84 mL cm−2 h−1 at 800 °C at 1.3 V. In the 10 h short-term stability test, the cell shows good electrolysis stability.

Plasma assisted preparation of highly active NiAl2O4 catalysts for propane steam reforming

In this study, Ni–Al spinel catalyst prepared with glycine-nitrate combustion method and treated by DBD plasma in different atmospheres have been investigated for propane steam reforming (PSR). It is revealed by H2-TPR that compared with traditional calcination method, NiO/Ni particles have much stronger interaction with the supports on the plasma-treated Ni–Al spinel catalysts. Therefore, catalysts with smaller NiO/Ni grains sizes, higher metallic Ni active surface areas can be achieved, as evidenced by XRD and H2 adsorption-desorption measurements. NH3-TPD results demonstrate that the plasma treatment led to a decrease of the acidity of the Ni–Al spinel catalyst. Furthermore, larger quantities of surface active oxygen sites are also formed after plasma treatment, as testified by the O2-TPD and XPS results. As a consequence, the plasma-treated catalysts show significantly improved catalytic activities and coke resistance. Plasma treatment in H2/Ar atmosphere after calcination process is considered to be the best route to prepare NiAl2O4 catalysts, which could be employed to obtain PSR catalysts with the highest catalytic activity and best anti-coking performance. It is believed that the higher metallic Ni active surface area and much more surface active oxygen sites induced by plasma treatment are the inherent reasons accounting for the enhanced catalytic performance of the Ni–Al spinel catalysts.

Thermal decomposition, phase evolution and morphology study of combustion synthesized alumina powder – Influence of precursor pH

Here, nanocrystalline alumina powder is prepared by the glycine-nitrate combustion method, maintaining stoichiometric fuel to oxidizer ratio and two different pH conditions. The in-situ exothermic reaction occurs between an oxidizer, and fuel found to be affected by the alkalinity of the precursor solution. During combustion synthesis, spontaneous ignition occurs with the generation of gases and foamy ashes. The ash crushed into powders and then calcined at different temperatures. Thermodynamic modelling is done to calculate the enthalpy of combustions and the number of moles of gases released from the stoichiometric chemical reactions. Different characterization techniques used to study the phase formation, surface area, microstructure and morphology of the ash and calcined alumina powders. Fine crystalline α - Al2O3 powder with high surface area formed in alkaline condition. Micrographs reveal that flaky morphology of the alumina powder changed to grain type on increasing the pH of the precursor solution.

Glycine–nitrate combustion engineering of neodymium cobaltite nanocrystals

NdCoO3 nanocrystals formed via glycine–nitrate combustion method followed by heat treatment has been systematically studied. Formation of NdCoO3 nanocrystals with minimal size of 7–10 nm from X-ray amorphous combustion products has been elucidated to be a very rapid process, occurring at the temperature of 550–600 °C for 5–30 min. The comparison of the minimum sizes of NdCoO3 crystallites obtained from the offered empirical relation dmin = lunit cell·N (where N is 7–12 and lunit cell is elementary cell parameter) and the data determined on the basis of X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed good correlation. The existence of special nanoporous microstructure and spatial limitations prevent NdCoO3 particle growth. The kinetic equation based on Avrami–Erofeev nucleation model was offered to be correlated well with experimental data of fractional conversion (α) versus isothermal time (τ). The apparent activation energy (Ea = (338 ± 32) kJ) of formation of NdCoO3 nanocrystals from X-ray amorphous combustion products obtained in excess of oxidant followed by heat treatment at 550–600 °C was determined.