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Title: Phase relations in a barium-rich high-temperature region (25-45 mol% CuO, 900-1100 deg. C) of the BaO-CuO{sub x} system

Abstract

The phase relations have been studied in the BaO-CuO{sub x} system in the range of 25.0-45.0 mol% CuO at 900-1100 deg. C at P(O{sub 2})=21 kPa (air) by visual polythermal analysis (VPA), powder X-ray diffraction (XRD), electron diffraction (ED) with simultaneous energy-dispersive X-ray (EDX) elemental analysis in a transmission electron microscope (TEM), and iodometric chemical analysis. The discrete deviations 2.02 (101:50), 2.04 (102:50), 2.10 (105:50) of Ba/Cu (Ba:Cu) composition from the stoichiometric ratio 2:1 have been found for the known Ba{sub 2}CuO{sub 3+{delta}} oxides in the subsolidus region 900-970 deg. C. Unit cell parameters of the 101:50 orthorhombic oxide, 102:50 tetragonal one, 105:50 orthorhombic one are, respectively, a=4.049, b=3.899, c=13.034 A; a=3.985, c=12.968 A; a=4.087, b=3.897 and c=12.950 A. ED patterns of the 101:50, 102:50, 105:50 oxides show characteristic supercell reflections with the respective vector 1/60[5 4 0], {approx}2/11<1 1 0> and 1/6[2 0 0]. Oxides of the 2:1, 7:4, 5:3 and 23:20 compositions have been found in the crystallization region 970-1050 deg. C. Unit cell parameters of the 2:1 orthorhombic oxide are a=4.095, b=3.795, c=13.165 A. Interplanar spacings and X-ray characteristic peak intensities of the 7:4, 5:3 and 23:20 oxides are given. Oxides 2:1 and 7:4 melt pseudocongruently atmore » 1020 and 1005 deg. C, oxides 5:3 and 23:20 melt incongruently at 995 and 980 deg. C, respectively. A diagram of the phase relations in the studied region of the BaO-CuO{sub x} system has been constructed, whose structure is considered as the total projection of phase states of the system existing for different x. - Graphical Abstract: A diagram of phase relations in the BaO-CuO{sub x} system in the range of 30.0-45.0 mol% CuO at 900-1050 deg. C at P(O{sub 2})=21 kPa (air) constructed on the data obtained by visual polythermal analysis (the liquidus line), XRD and ED with elemental analysis. Highlights: > A combination of physical-chemical and structural methods was used. > New discrete oxides have been found. > The diagram reflects the total projection of phase states at different x.« less

Authors:
 [1]; ;  [1]
  1. Institute of Solid State Physics of the RAS, Chernogolovka, Moscow District, 142432 (Russian Federation)
Publication Date:
OSTI Identifier:
21580156
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 184; Journal Issue: 7; Other Information: DOI: 10.1016/j.jssc.2011.05.028; PII: S0022-4596(11)00277-5; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BARIUM; BARIUM OXIDES; COPPER OXIDES; CRYSTALLIZATION; ELECTRON DIFFRACTION; IODOMETRY; ORTHORHOMBIC LATTICES; PHASE DIAGRAMS; TEMPERATURE RANGE 0400-1000 K; TRANSMISSION ELECTRON MICROSCOPY; X RADIATION; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; BARIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; COHERENT SCATTERING; COPPER COMPOUNDS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIAGRAMS; DIFFRACTION; ELECTROMAGNETIC RADIATION; ELECTRON MICROSCOPY; ELEMENTS; INFORMATION; IONIZING RADIATIONS; METALS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; QUANTITATIVE CHEMICAL ANALYSIS; RADIATIONS; SCATTERING; TEMPERATURE RANGE; TITRATION; TRANSITION ELEMENT COMPOUNDS; VOLUMETRIC ANALYSIS

Citation Formats

Klinkova, L A, Nikolaichik, V.I., E-mail: nikola@iptm.ru, Barkovskii, N V, and Fedotov, V K. Phase relations in a barium-rich high-temperature region (25-45 mol% CuO, 900-1100 deg. C) of the BaO-CuO{sub x} system. United States: N. p., 2011. Web. doi:10.1016/j.jssc.2011.05.028.
Klinkova, L A, Nikolaichik, V.I., E-mail: nikola@iptm.ru, Barkovskii, N V, & Fedotov, V K. Phase relations in a barium-rich high-temperature region (25-45 mol% CuO, 900-1100 deg. C) of the BaO-CuO{sub x} system. United States. https://doi.org/10.1016/j.jssc.2011.05.028
Klinkova, L A, Nikolaichik, V.I., E-mail: nikola@iptm.ru, Barkovskii, N V, and Fedotov, V K. 2011. "Phase relations in a barium-rich high-temperature region (25-45 mol% CuO, 900-1100 deg. C) of the BaO-CuO{sub x} system". United States. https://doi.org/10.1016/j.jssc.2011.05.028.
@article{osti_21580156,
title = {Phase relations in a barium-rich high-temperature region (25-45 mol% CuO, 900-1100 deg. C) of the BaO-CuO{sub x} system},
author = {Klinkova, L A and Nikolaichik, V.I., E-mail: nikola@iptm.ru and Barkovskii, N V and Fedotov, V K},
abstractNote = {The phase relations have been studied in the BaO-CuO{sub x} system in the range of 25.0-45.0 mol% CuO at 900-1100 deg. C at P(O{sub 2})=21 kPa (air) by visual polythermal analysis (VPA), powder X-ray diffraction (XRD), electron diffraction (ED) with simultaneous energy-dispersive X-ray (EDX) elemental analysis in a transmission electron microscope (TEM), and iodometric chemical analysis. The discrete deviations 2.02 (101:50), 2.04 (102:50), 2.10 (105:50) of Ba/Cu (Ba:Cu) composition from the stoichiometric ratio 2:1 have been found for the known Ba{sub 2}CuO{sub 3+{delta}} oxides in the subsolidus region 900-970 deg. C. Unit cell parameters of the 101:50 orthorhombic oxide, 102:50 tetragonal one, 105:50 orthorhombic one are, respectively, a=4.049, b=3.899, c=13.034 A; a=3.985, c=12.968 A; a=4.087, b=3.897 and c=12.950 A. ED patterns of the 101:50, 102:50, 105:50 oxides show characteristic supercell reflections with the respective vector 1/60[5 4 0], {approx}2/11<1 1 0> and 1/6[2 0 0]. Oxides of the 2:1, 7:4, 5:3 and 23:20 compositions have been found in the crystallization region 970-1050 deg. C. Unit cell parameters of the 2:1 orthorhombic oxide are a=4.095, b=3.795, c=13.165 A. Interplanar spacings and X-ray characteristic peak intensities of the 7:4, 5:3 and 23:20 oxides are given. Oxides 2:1 and 7:4 melt pseudocongruently at 1020 and 1005 deg. C, oxides 5:3 and 23:20 melt incongruently at 995 and 980 deg. C, respectively. A diagram of the phase relations in the studied region of the BaO-CuO{sub x} system has been constructed, whose structure is considered as the total projection of phase states of the system existing for different x. - Graphical Abstract: A diagram of phase relations in the BaO-CuO{sub x} system in the range of 30.0-45.0 mol% CuO at 900-1050 deg. C at P(O{sub 2})=21 kPa (air) constructed on the data obtained by visual polythermal analysis (the liquidus line), XRD and ED with elemental analysis. Highlights: > A combination of physical-chemical and structural methods was used. > New discrete oxides have been found. > The diagram reflects the total projection of phase states at different x.},
doi = {10.1016/j.jssc.2011.05.028},
url = {https://www.osti.gov/biblio/21580156}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 7,
volume = 184,
place = {United States},
year = {Fri Jul 15 00:00:00 EDT 2011},
month = {Fri Jul 15 00:00:00 EDT 2011}
}