Using the homogenizing annealing method and X-ray powder diffraction, it was shown that in the quasi-ternary PrOx–CoO–NiO system at 1373 K in air, two series of solid solutions are formed: PrCo _1 - x NixO3 (0.0 ≤ x ≤ 0.4) with the orthorhombically distorted perovskite structure and Pr4Ni _3 - y CoyO _10 - δ (0.7 ≤ y ≤ 1.5) with the Ruddlesden–Popper type structure with n = 3. The oxygen content in both series of solid solutions is close to stoichiometric. It is assumed that Ni2+ ions are predominantly located in octahedra located in the middle of the perovskite block, while Ni3+ and Co3+ ions are in octahedra adjacent to the rock salt layers. Phase diagrams of the PrOx–CoOx and PrOx–NiO systems were constructed in “T–composition” coordinates in air using literature data.

Solid solutions Ba1-xPrxFe1-yCoyO3-δ (x = 0.3, y = 0.1-0.6 and x = 0.1-0.6, y = 0.2) with cubic structure were synthesized through a glycerol-nitrate technique. The oxygen content, thermal expansion, electrical conductivity and the Seebeck coefficient in the Ba1-xPrxFe1-yCoyO3-δ oxides were measured versus temperature in air. The oxygen content increases with increasing iron and praseodymium concentrations in Ba1-xPrxFe1-yCoyO3-δ. The value of the thermal expansion coefficient weakly depends on the composition of solid solutions. The conductivity of Ba1-xPrxFe1-yCoyO3-δ is practically independent of the concentration of 3d metals and increases significantly with increasing praseodymium content. The maximum conductivity value of 210 S/cm is obtained for Ba0.4Pr0.6Fe0.8Co0.2O3-δ at 450 °C in air. A positive value of the Seebeck coefficient indicates the predominant p-type conductivity in Ba1-xPrxFe1-yCoyO3-δ.

A novel copper(II) complex based on N-2-(2-pyridyl)ethyl-2-aminoethanesulfonic acid is prepared, its structure is studied by XRD (CCDC No. 2215117). The crystal of the complex is formed by monomeric [CuLH2O]NO3 units. The metal centers of the units have an octahedral coordination environment formed by nitrogen atoms of pyridine and the amino group, oxygen atoms of the sulfo group, and water molecules located in the equatorial plane. On the axial axis, there are oxygen atoms of the sulfo groups of the neighboring ligands forming a 1D coordination polymer.

Синтезирован новый комплекс меди(II) на основе N-2-(2-пиридил)этил-2-аминоэтансульфокислоты и изучено его строение методом рентгеноструктурного анализа (депозит CCDC № 2215117). Кристалл комплекса образован мономерными звеньями состава [CuLH2O]NO3, в которых октаэдрическое координационное окружение металлоцентра формируется атомами азота пиридина и аминогруппы, атомами кислорода сульфогруппы и молекулы воды, располагающимися в экваториальной плоскости. На аксиальной оси находятся атомы кислорода сульфогрупп соседних лигандов, которые формируют 1D координационный полимер.

The phase relationships in the quasi-quaternary system GdCoO3–SrCoO3–δ–SrFeO3–δ–GdFeO3 at 1373 K in air have been studied. The homogeneity ranges and crystal structure of solid solutions with overall composition Gd1–xSrxCo1–yFeyO3–δ have been determined. Depending on the concentration of introduced strontium and iron, the Gd1–xSrxCo1–yFeyO3–δ oxides crystallize in orthorhombic (x = 0.1 and 0.4 ≤ y ≤ 1.0; x = 0.2 and y = 0.9, space group Pbnm), tetragonal (0.6 ≤ x ≤ 0.8 and 0.1 ≤ y ≤ 0.5, space group I4/mmm) or cubic (x = 0.9 and 0.1 ≤ y ≤ 0.9; 0.6 ≤ x ≤ 0.8 and 0.6 ≤ y ≤ 0.9, space group Pm 3 m) perovskite structure. Structural parameters were determined for all single-phase samples. It was found that an increase in the concentration of strontium and iron leads to an increase in the unit cells parameters of the Gd1–xSrxCo1–yFeyO3–δ oxides. It has been shown that the oxygen content in the Gd1–xSrxCo0.3Fe0.7O3–δ oxides, determined by thermogravimetric analysis, decreases with increasing temperature and strontium content. An isobaric-isothermal phase diagram for the GdCoO3–SrCoO3–δ–SrFeO3–δ–GdFeO3 system at 1373 K in air was constructed.

Solid solutions Ba 1- x Pr x Fe 1- y Co y O 3-delta ( x = 0.3, y = 0.1-0.6 and x = 0.1-0.6, y = 0.2) with cubic structure were synthesized through a glycerol-nitrate technique. The oxygen content, thermal expansion, electrical conductivity and the Seebeck coefficient in the Ba 1- x Pr x Fe 1- y Co y O 3-delta oxides were measured versus temperature in air. The oxygen content increases with increasing iron and praseodymium concentrations in Ba 1- x Pr x Fe 1- y Co y O 3-delta . The value of the thermal expansion coefficient weakly depends on the composition of solid solutions. The conductivity of Ba 1- x Pr x Fe 1- y Co y O 3-delta is practically independent of the concentration of 3 d metals and increases significantly with increasing praseodymium content. The maximum conductivity value of 210 S/cm is obtained for Ba 0.4 Pr 0.6 Fe 0.8 Co 0.2 O 3-delta at 450 degrees C in air. A positive value of the Seebeck coefficient indicates the predominant p - type conductivity in Ba 1- x Pr x Fe 1- y Co y O 3-delta .

The crystal structure, oxygen content and homogeneity range of Pr1-xSrxCoO3-õ solid solutions from room temperature (RT) up to 1100 °C in air were studied. It has been shown that an increase in temperature and Sr content causes an Orthorhombic → Rhombohedral → Cubic transformation of the crystal structure. The heterovalent substitution of Sr2+ for Pr3+ is compensated by an increase in the mean oxidation state of Co ions (zCo) and the formation of oxygen vacancies. The temperature dependences of thermal expansion and conductivity of Pr1-xSrxCoO3-õ solid solutions are explained from the point of view of crystal and defect structure. The diagram of phase relation in the PrCoO3 – “SrCoOz” cross section has been constructed.

The homogeneity ranges and crystal structure of solid solutions of Nd _1 - x BaxCo _1 - y FeyO _3 - δ composition were detected. Depending on introduced barium concentration Nd _1 - x BaxCo _1 - y FeyO _3 - δ oxides have been crystallized in the orthorhombically distorted (x = 0.05, sp. gr. Pbnm), cubic (0.6 ≤ x ≤ 0.9, sp. gr. Pm-3m) perovskite structure or double perovskite structure NdBaCo _2 - x FexO _5 + δ (0.0 ≤ x ≤ 1.4, sp. gr. P4/mmm). The dependencies of unit cell parameters versus composition of the Nd _1 - x BaxCo _1 - y FeyO _3 - δ solid solutions were obtained. It is shown that the values of oxygen nonstoichiometry in Nd _1 - x BaxCo _1 - y FeyO _3 - δ , determined by a thermogravimetric method within the temperature range 298–1373 K in air, increased with the raise of barium and cobalt content. Average values of thermal expansion coefficients for the Nd _1 - x BaxCo _1 - y FeyO _3 - δ oxides (0.8 ≤ x ≤ 0.9 and 0.7 ≤ y ≤ 0.9) visibly increased with temperature from (13.5–14.5) × 10–6 K–1 at 300–700 K up to (23.2–26.2) × 10–6 K–1 at 700–1373 K.

A series of samples with the overall composition Gd1-xSrxCo1-yFeyO3-δ (x = 0.8; 0.9 and 0.1 ≤ y ≤ 0.9), which are promising materials for catalytic and SOFC application, was prepared by a glycerol nitrate technique. X-ray diffraction analysis allowed to describe Gd0.2Sr0.8Co1-yFeyO3-δ with 0.1 ≤ y ≤ 0.5 in a tetragonal 2ap × 2ap × 4ap superstructure (SG I4/mmm), while oxides with 0.6 ≤ y ≤ 0.9 exhibit cubic disordered perovskite structure (SG Pm-3m). All Gd0.1Sr0.9Fe1-yCoyO3-δ oxides within the composition range 0.1 ≤ y ≤ 0.9 possess the cubic perovskite structure (SG Pm-3m). The structural parameters were refined using the Rietveld full-profile method. The changes of oxygen content in Gd1-xSrxCo1-yFeyO3-δ versus temperature were determined by thermogravimetric analysis. The introduction of iron into the cobalt sublattice leads to a gradual increase in the unit cell parameters and unit cell volume, accompanied with increasing oxygen content. The temperature dependency of conductivity for Gd0.2Sr0.8Co0.3Fe0.7O3-δ exhibits a maximum (284 S/cm) at ≈600 K in air. The positive value of the Seebeck coefficient indicates predominant p-type conductivity in the Gd0.2Sr0.8Co0.3Fe0.7O3-δ complex oxide.

Samples of general formula Ba0.9Ln0.1Fe1 – yCoyO3 – δ (Ln = Nd, Sm, Eu; y = 0.1–0.9) were studied at 1100°С under air. X-ray powder diffraction data for samples prepared by glycerol–nitrate technology were used to determine the homogeneity range of Ba0.9Ln0.1Fe1 – yCoyO3 – δ solid solutions (ss): 0.1 ≤ y ≤ 0.7 for Ln = Nd, 0.1 ≤ y ≤ 0.5 for Ln = Sm, and 0.1 ≤ y ≤ 0.4 for Ln = Eu. The crystal structure of single-phase oxides was described in terms of a cubic unit cell (space group $$Pm\bar {3}m$$ ). The increasing cobalt content or rare-earth atomic radius brings about an increase in Ba0.9Ln0.1Fe1 – yCoyO3 – δ unit cell parameter. The oxygen content (3 – δ) in the temperature range 25–1100°C under air was determined by thermogravimetry and iodometric titration. Oxygen exchange between the solid oxide and gas phase starts at ~350°С. The oxygen content and mean oxidation state of the 3d metal in Ba0.9Ln0.1Fe1 – yCoyO3 – δ both decrease as the cobalt concentration increases or the lanthanide atomic number increases.

The phase equilibria in the 1/2Nd(2)O(3)-BaO-1/2Fe(2)O(3) system were systematically studied at 1373 K in air and presented in the form of a phase diagram. By X-ray diffraction (XRD) analysis of quenched samples, the homogeneity ranges and crystal structure were determined for the following intermediate oxides: Nd1-xBaxFeO3-delta with 0.0 <= x <= 0.05 (space group (SG) Pnma) and with 0.6 <= x <= 0.7 (SG Pm-3m), Ba6+yNd2-yFe4O15-delta with 0.0 <= y <= 0.4 (SG P6(3)mc), and Ba1.1Nd1.9Fe2O7-delta (SG P4(2)/mnm). The structural parameters of single-phase oxides were refined by the Rietveld method. The changes in oxygen content for Nd1-xBaxFeO3-delta (0.6 <= x <= 0.7), Ba6Nd2Fe4O15-delta, and Ba1.1Nd1.9Fe2O7-delta versus temperature in air were determined by thermogravimetric analysis. Gradual substitution of neodymium by barium in the Nd1-xBaxFeO3-delta (0.6 <= x <= 0.7) oxides leads to a decrease of oxygen content. Partial ordering via formation of separate domains with a(p) x a(p) x 5a(p) superstructure in Nd0.4Ba0.6FeO3-delta, which cannot be detected by XRD, noticeably influence its thermal expansion and electrical conductivity.

The cutting-edge industrial product creation faces battling goals. There is an additional expenditure need to enhance new product reliability, and nevertheless, an enterprise should reduce product costs to receive the long-term development funds. This conflict resolution depends on a design engineer, who should take into account the future product costs as early, as possible. So, the purpose of this article is to elicit the most widespread cost estimation models at all design stages. I purposely investigate the models' limits to propose their common frame. The research methodology is Scopus scientometrics. First, I elicit the most authoritative reviews on the design cost estimation topic. Then I made the reviews content analysis and summarize the models’ limitations. Findings show that the design cost estimation models significantly vary. They do not eliminate or substitute for each other. Each model is suitable in an appropriate designing process place. Scientometric analysis points that advanced cost estimation models are poorly evolved for enterprise efficiency prediction including the aerospace industry. To overcome these obstacles, I propose an enterprise goal model. This study’s novelty is that a fitting combination of cost estimation models ensures the whole enterprise's economical effectiveness.

The boundaries of homogeneity ranges and structure of solid solutions formed in the quasi-ternary Nd2O3–MO–Fe2O3 (M = Ca, Sr) systems at 1373 K in air were determined by the homogenizing annealing and X-ray powder diffraction methods. It was found that two types of solid solutions have formed in the Nd–Ca–Fe–O system: Nd1– xCaxFeO3 – δ (0 ≤ x < 0.35 and 0.95 ≤ x < 1.00) and Ca2– yNdyFeO4 – δ (0.90 ≤ y ≤ 0.95), but four solid solutions in the Nd–Sr–Fe–O system: Nd1– xSrxFeO3 – δ (0 < x ≤ 0.6 and 0.7 ≤ x ≤ 0.9), Sr2 –yNdyFeO4 – δ (0.7 ≤ y ≤ 0.9), Sr3– zNdzFe2O7 – δ (0 < z ≤ 0.4 and 1.8 ≤ z ≤ 1.9) and. Sr4 –uNduFe3O10 – δ (0.7 ≤ u ≤ 0.9). The structural parameters of the solid oxides were refined by the full-profile Rietveld analysis. The unit cell parameters versus composition of solid solutions were plotted.

The purpose. The purpose of this article is to convincingly reveal the most influential viewpoints on the team paradigm in the knowledge management (KM) scientific field and to bring them together. Then I argue that the specifics of knowledge-intensive enterprises impose the model, which fundamentally differs from both the transactional approach and the specialists' financial responsibility rule. I propose to build a team motivation model (TMM) by synthesizing both different KM theoretical approaches, and some practical features of knowledge-intensive enterprises. Design/methodology/approaches. The quantitative method is a bibliometric assessment of the team motivation aspect in the KM theory. The qualitative one is content analysis of the most influential KM publications. Findings: the bibliometric research on the Web-of-Science platform reveals that the team motivation topic is not duly studied nowadays. Key Knowledge Management articles, which regard a team as an indispensable knowledge creation term, provide non-uniformed approaches. The results of team motivation modeling prove that the tacit-explicit knowledge conversion effectiveness depends not as much on individual specialists' knowledge and skills, but rather on organizational goal dynamics. Originality/value: Theoretical value is that this article highlights the publications that gave us the team topic as focal in KM scientific field and pulls together the key theoretical KM dissimilarities. The practical novelty is that the proposed model describes not as much distribution of organizational resources integrity, but rather a phenomenon of specialists' self-organization to raise such integrity. Research implications: the bibliometric analysis clarifies following theoretical paradigms: 1) path-dependent knowledge, which Cohen and Levinthal introduced in 1990; 2) consciousness, which Nonaka (1994) developed in his KM seminal paper.

X-ray powder diffraction and Rietveld full-profile analysis are used to establish the homogeneity ranges and crystalline structure of solid solutions Nd2−zCazO3−z/2 (0.0 ≤ z ≤ 0.1, space group P$$\bar {3}$$m1) and Nd2−yCayCoO4−δ (0.7 ≤ y ≤ 1.0, space group I 4/mmm). Dependences of the unit cell parameters on the composition of solid solution Nd2−yCayCoO4−δ are obtained. It is shown that all cobaltites Nd2−yCayCoO4−δ in the temperature range of 298–1373 K in air possess virtually stoichiometric composition. Average values of thermal expansion coefficients for Nd2−yCayCoO4−δ (y = 0.8; 0.9) are calculated. An isobaric-isothermal section of the phase diagram for the 1/2Nd2O3–CaO–CoO system at 1373 K in the air has been constructed.

The purpose of the study is to systematize the main directions of development of the theory of resource management and the theory of knowledge management at the level of an enterprise economic activity. The research is particularly concentrated on the «enterprise» concept development, which is the focus of two theories intersection. The publication arrays structural analysis, made on Scopus and Web-of-Science databases, reveals theories paradigms. The algorithm of using scientometric tools allowed us to integrate paradigm trends and then to trace knowledge-intensive enterprises characteristics dynamics. As a result of comparison of interpretations of the concept «enterprise» in two theories constructive contradictions which, in our opinion, are directions of future researches are formulated. The structure of the article: (1) method and scientometric algorithm of research taking into account the specifics of social Sciences; (2) analysis of the development of the theories of «resource management» and «knowledge management», the authors and paradigms; (3) the main characteristics and problems of management of knowledge-intensive enterprises in the focus of paradigms of each theory, the modern development of the concept of «enterprise»; (4) contradictions in the theories of resource management and knowledge about the prospects of enterprise management, directions of future research.

The purpose of the study is to find out the main trends of the knowledge management theory. The research object is a knowledge economy publications bulk indexed in Web-of-Science and Scopus databases. The research is particularly concentrated on the main interrelations between keywords, which demonstrate the selection of priority directions for the development of knowledge management theory. The research method is systematic logical analysis. The evolution of the firm theory concept shows that the knowledge management theory is the top of the theoretical description of organizations’ economic activity. To find out the knowledge management theory priorities, there is described an algorithm to analyze publications indexed in the WoS and Scopus databases. The main four trends are distinguished here: organizational training; obtaining-new-knowledge-versus-using-accumulated-knowledge dichotomy; ambidexterity; knowledge absorption capacity. The review of the 2017–2019 articles allowed us to formulate some problems of interaction between universities and high-tech enterprises and to determine the directions of further research. Our systematization of the main trends of the knowledge management theory can be applied for long-term planning of universities’ research work.

The phase equilibria in the NdFeO3−δ – SrFeO3−δ – SrCoO3−δ – NdCoO3−δ system were studied at 1373K in air. The homogeneity ranges and crystal structure of Nd1−xSrxFe1−yCoyO3−δ solid solutions were determined by the X-ray powder diffraction, the unit cell parameters were refined by the Rietveld analysis. It was found that Nd1−xSrxFe1−yCoyO3−δ with 0.0≤x≤0.6 and 0.1≤y≤0.9 possesses orthorhombic structure (sp. gr. Pbnm) that reveals O-type→O′-type→O-type structural transition. The orthorhombic distortion decreases with the increasing of strontium content, as a result Nd1−xSrxFe1−yCoyO3−δ solid solutions with 0.7≤x≤0.9 and 0.1≤y≤0.9 possess the cubic structure (sp. gr. Pm3m). Isothermal-isobaric phase diagram for the NdFeO3−δ – SrFeO3−δ – SrCoO3−δ – NdCoO3−δ system at 1373K in air has been presented. A series of samples with the overall composition Nd0.2Sr0.8Fe1−yCoyO3−δ (0.0≤y≤1.0) were characterized by the thermogravimetric analysis, iodometric titration, dilatometry and electrical conductivity measurements. The oxygen nonstoichiometry in Nd0.2Sr0.8Fe1−yCoyO3−δ (0.0≤y≤1.0) increases with increasing temperature and cobalt content. Gradual substitution of iron by cobalt in the Nd0.2Sr0.8Fe1−yCoyO3−δ oxides leads to the increase of the average thermal expansion coefficients. The electrical conductivity exhibits maximum within the range of 600–750K and significantly increased with cobalt content at T<800K. Chemical compatibility of Nd0.2Sr0.8Fe1−yCoyO3−δ with Ce0.8Sm0.2O2−δ and La0.88Sr0.12Ga0.82Mg0.12O3−δ solid electrolytes has been studied. The single cells based on the LSGM electrolyte, Sr2Ni0.75Mg0.25MoO6 anode and Nd0.2Sr0.8Fe1−yCoyO3−δ (y=0.3 and 1.0) cathode were fabricated and examined.