Phase evolution and gas-phase particle size distributions during spray pyrolysis of (Bi, Pb)-Sr-Ca-Cu-O and Ag-(Bi, Pb)-Sr-Ca-Cu-O powders

Abhijit Gurav, Toivo Kodas, Jorma Joutsensaari (Corresponding Author), Riitta Zilliacus, E.I. Kauppinen (Corresponding Author)

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Abstract

Phase evolution, gas-phase particle size distributions and lead loss were studied during formation of (Bi,Pb)-Sr-Ca-Cu-O powders and their composites with silver by spray pyrolysis starting from nitrate solutions. The 10 wt% Ag/90 wt% Bi1.8Pb0.44Sr2Ca2.2Cu3Ox composite powders made at 700°C consisted of 20–60 nm grains of silver and mixed-oxide phases with a fine dispersion of Ag grains within the particles. At 700°C, the primary phases present in (Bi,Pb)-Sr-Ca-Cu-O powders were (Bi,Pb)2Sr2CuOx (2201), Ca2PbO4 (plumbate), (Bi,Pb)2Sr2CaCu2Ox(2212), and (Bi,Pb)3Sr2Ca2Cu1Ox(3221). For T≥800°C, the powders were considerably depleted in lead, and the plumbate and 3221 phases were absent. For T = 900°C, a large number of ultrafine particles (<30 nm) were formed, probably from the PbO vapor released from the reactor walls. Using spray pyrolysis, it is easy to control stoichiometry and limit the phase segregation at the nanometer-scale so that homogeneous and phase-pure materials can be obtained rapidly during subsequent processing.
Original languageEnglish
Pages (from-to)583-589
Number of pages7
JournalNanostructured Materials
Volume4
Issue number5
DOIs
Publication statusPublished - 1994
MoE publication typeA1 Journal article-refereed

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pyrolysis
spray
silver
particle size
stoichiometry
gas
oxide
nitrate
particle
loss
material
reactor

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Gurav, Abhijit ; Kodas, Toivo ; Joutsensaari, Jorma ; Zilliacus, Riitta ; Kauppinen, E.I. / Phase evolution and gas-phase particle size distributions during spray pyrolysis of (Bi, Pb)-Sr-Ca-Cu-O and Ag-(Bi, Pb)-Sr-Ca-Cu-O powders. In: Nanostructured Materials. 1994 ; Vol. 4, No. 5. pp. 583-589.
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title = "Phase evolution and gas-phase particle size distributions during spray pyrolysis of (Bi, Pb)-Sr-Ca-Cu-O and Ag-(Bi, Pb)-Sr-Ca-Cu-O powders",
abstract = "Phase evolution, gas-phase particle size distributions and lead loss were studied during formation of (Bi,Pb)-Sr-Ca-Cu-O powders and their composites with silver by spray pyrolysis starting from nitrate solutions. The 10 wt{\%} Ag/90 wt{\%} Bi1.8Pb0.44Sr2Ca2.2Cu3Ox composite powders made at 700°C consisted of 20–60 nm grains of silver and mixed-oxide phases with a fine dispersion of Ag grains within the particles. At 700°C, the primary phases present in (Bi,Pb)-Sr-Ca-Cu-O powders were (Bi,Pb)2Sr2CuOx (2201), Ca2PbO4 (plumbate), (Bi,Pb)2Sr2CaCu2Ox(2212), and (Bi,Pb)3Sr2Ca2Cu1Ox(3221). For T≥800°C, the powders were considerably depleted in lead, and the plumbate and 3221 phases were absent. For T = 900°C, a large number of ultrafine particles (<30 nm) were formed, probably from the PbO vapor released from the reactor walls. Using spray pyrolysis, it is easy to control stoichiometry and limit the phase segregation at the nanometer-scale so that homogeneous and phase-pure materials can be obtained rapidly during subsequent processing.",
author = "Abhijit Gurav and Toivo Kodas and Jorma Joutsensaari and Riitta Zilliacus and E.I. Kauppinen",
year = "1994",
doi = "10.1016/0965-9773(94)90067-1",
language = "English",
volume = "4",
pages = "583--589",
journal = "Nanostructured Materials",
issn = "0965-9773",
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}

Phase evolution and gas-phase particle size distributions during spray pyrolysis of (Bi, Pb)-Sr-Ca-Cu-O and Ag-(Bi, Pb)-Sr-Ca-Cu-O powders. / Gurav, Abhijit; Kodas, Toivo; Joutsensaari, Jorma (Corresponding Author); Zilliacus, Riitta; Kauppinen, E.I. (Corresponding Author).

In: Nanostructured Materials, Vol. 4, No. 5, 1994, p. 583-589.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Phase evolution and gas-phase particle size distributions during spray pyrolysis of (Bi, Pb)-Sr-Ca-Cu-O and Ag-(Bi, Pb)-Sr-Ca-Cu-O powders

AU - Gurav, Abhijit

AU - Kodas, Toivo

AU - Joutsensaari, Jorma

AU - Zilliacus, Riitta

AU - Kauppinen, E.I.

PY - 1994

Y1 - 1994

N2 - Phase evolution, gas-phase particle size distributions and lead loss were studied during formation of (Bi,Pb)-Sr-Ca-Cu-O powders and their composites with silver by spray pyrolysis starting from nitrate solutions. The 10 wt% Ag/90 wt% Bi1.8Pb0.44Sr2Ca2.2Cu3Ox composite powders made at 700°C consisted of 20–60 nm grains of silver and mixed-oxide phases with a fine dispersion of Ag grains within the particles. At 700°C, the primary phases present in (Bi,Pb)-Sr-Ca-Cu-O powders were (Bi,Pb)2Sr2CuOx (2201), Ca2PbO4 (plumbate), (Bi,Pb)2Sr2CaCu2Ox(2212), and (Bi,Pb)3Sr2Ca2Cu1Ox(3221). For T≥800°C, the powders were considerably depleted in lead, and the plumbate and 3221 phases were absent. For T = 900°C, a large number of ultrafine particles (<30 nm) were formed, probably from the PbO vapor released from the reactor walls. Using spray pyrolysis, it is easy to control stoichiometry and limit the phase segregation at the nanometer-scale so that homogeneous and phase-pure materials can be obtained rapidly during subsequent processing.

AB - Phase evolution, gas-phase particle size distributions and lead loss were studied during formation of (Bi,Pb)-Sr-Ca-Cu-O powders and their composites with silver by spray pyrolysis starting from nitrate solutions. The 10 wt% Ag/90 wt% Bi1.8Pb0.44Sr2Ca2.2Cu3Ox composite powders made at 700°C consisted of 20–60 nm grains of silver and mixed-oxide phases with a fine dispersion of Ag grains within the particles. At 700°C, the primary phases present in (Bi,Pb)-Sr-Ca-Cu-O powders were (Bi,Pb)2Sr2CuOx (2201), Ca2PbO4 (plumbate), (Bi,Pb)2Sr2CaCu2Ox(2212), and (Bi,Pb)3Sr2Ca2Cu1Ox(3221). For T≥800°C, the powders were considerably depleted in lead, and the plumbate and 3221 phases were absent. For T = 900°C, a large number of ultrafine particles (<30 nm) were formed, probably from the PbO vapor released from the reactor walls. Using spray pyrolysis, it is easy to control stoichiometry and limit the phase segregation at the nanometer-scale so that homogeneous and phase-pure materials can be obtained rapidly during subsequent processing.

U2 - 10.1016/0965-9773(94)90067-1

DO - 10.1016/0965-9773(94)90067-1

M3 - Article

VL - 4

SP - 583

EP - 589

JO - Nanostructured Materials

JF - Nanostructured Materials

SN - 0965-9773

IS - 5

ER -