Effect of phase separation in metal carboxylate gels on perovskite lead magnesium niobate crystallization

Yeshwanth Narendar, Gary Lynn Messing

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Phase separation during the synthesis and decomposition of lead magnesium niobate (PMN)-ethylenediaminetetraacetic acid (EDTA) and PMN-citrate gels strongly affects perovskite Pb(Mg1/3Nb2/3)O3 phase formation. The PMN-EDTA gel was synthesized from a solution containing Pb-EDTA, Mg-EDTA, and peroxo-citrato-niobium complexes at pH 8. Pb-EDTA precipitation was avoided by using Pb:EDTA in the mole ratio >1:2.5 and flash pyrolyzing the PMN-EDTA solution at 225 °C. Consequently, the PMN yield increased from 80 to 98 wt%. The sequential decomposition of Pb-EDTA, Mg-EDTA, and peroxo-citrato-Nb in the PMN-EDTA precursor in 1 vol% O2 leads to phase separation of Pb and PbO and thus lowers the PMN yield to 92 wt%. At PO(2)>2.5 vol% the Pb, Mg, and Nb complexes cothermolyze to form ≥97% perovskite PMN. The presence of a heterometallic citrato-Pb-Mg-Nb complex in PMN-citrate leads to oxygen partial pressure independent codecomposition of the Pb, Mg, and Nb complexes. Accordingly, PMN yields of ≥96 wt% were obtained from the PMN-citrate precursor for oxygen partial pressures between 1 and 5 vol%.

Original languageEnglish (US)
Pages (from-to)3921-3931
Number of pages11
JournalJournal of Materials Research
Volume14
Issue number10
DOIs
StatePublished - Jan 1 1999

Fingerprint

ethylenediaminetetraacetic acids
niobates
Ethylenediaminetetraacetic acid
Crystallization
Edetic Acid
Phase separation
Perovskite
carboxylates
Magnesium
magnesium
Gels
Lead
Metals
gels
crystallization
metals
citrates
Citric Acid
Partial pressure
partial pressure

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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title = "Effect of phase separation in metal carboxylate gels on perovskite lead magnesium niobate crystallization",
abstract = "Phase separation during the synthesis and decomposition of lead magnesium niobate (PMN)-ethylenediaminetetraacetic acid (EDTA) and PMN-citrate gels strongly affects perovskite Pb(Mg1/3Nb2/3)O3 phase formation. The PMN-EDTA gel was synthesized from a solution containing Pb-EDTA, Mg-EDTA, and peroxo-citrato-niobium complexes at pH 8. Pb-EDTA precipitation was avoided by using Pb:EDTA in the mole ratio >1:2.5 and flash pyrolyzing the PMN-EDTA solution at 225 °C. Consequently, the PMN yield increased from 80 to 98 wt{\%}. The sequential decomposition of Pb-EDTA, Mg-EDTA, and peroxo-citrato-Nb in the PMN-EDTA precursor in 1 vol{\%} O2 leads to phase separation of Pb and PbO and thus lowers the PMN yield to 92 wt{\%}. At PO(2)>2.5 vol{\%} the Pb, Mg, and Nb complexes cothermolyze to form ≥97{\%} perovskite PMN. The presence of a heterometallic citrato-Pb-Mg-Nb complex in PMN-citrate leads to oxygen partial pressure independent codecomposition of the Pb, Mg, and Nb complexes. Accordingly, PMN yields of ≥96 wt{\%} were obtained from the PMN-citrate precursor for oxygen partial pressures between 1 and 5 vol{\%}.",
author = "Yeshwanth Narendar and Messing, {Gary Lynn}",
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Effect of phase separation in metal carboxylate gels on perovskite lead magnesium niobate crystallization. / Narendar, Yeshwanth; Messing, Gary Lynn.

In: Journal of Materials Research, Vol. 14, No. 10, 01.01.1999, p. 3921-3931.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Effect of phase separation in metal carboxylate gels on perovskite lead magnesium niobate crystallization

AU - Narendar, Yeshwanth

AU - Messing, Gary Lynn

PY - 1999/1/1

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N2 - Phase separation during the synthesis and decomposition of lead magnesium niobate (PMN)-ethylenediaminetetraacetic acid (EDTA) and PMN-citrate gels strongly affects perovskite Pb(Mg1/3Nb2/3)O3 phase formation. The PMN-EDTA gel was synthesized from a solution containing Pb-EDTA, Mg-EDTA, and peroxo-citrato-niobium complexes at pH 8. Pb-EDTA precipitation was avoided by using Pb:EDTA in the mole ratio >1:2.5 and flash pyrolyzing the PMN-EDTA solution at 225 °C. Consequently, the PMN yield increased from 80 to 98 wt%. The sequential decomposition of Pb-EDTA, Mg-EDTA, and peroxo-citrato-Nb in the PMN-EDTA precursor in 1 vol% O2 leads to phase separation of Pb and PbO and thus lowers the PMN yield to 92 wt%. At PO(2)>2.5 vol% the Pb, Mg, and Nb complexes cothermolyze to form ≥97% perovskite PMN. The presence of a heterometallic citrato-Pb-Mg-Nb complex in PMN-citrate leads to oxygen partial pressure independent codecomposition of the Pb, Mg, and Nb complexes. Accordingly, PMN yields of ≥96 wt% were obtained from the PMN-citrate precursor for oxygen partial pressures between 1 and 5 vol%.

AB - Phase separation during the synthesis and decomposition of lead magnesium niobate (PMN)-ethylenediaminetetraacetic acid (EDTA) and PMN-citrate gels strongly affects perovskite Pb(Mg1/3Nb2/3)O3 phase formation. The PMN-EDTA gel was synthesized from a solution containing Pb-EDTA, Mg-EDTA, and peroxo-citrato-niobium complexes at pH 8. Pb-EDTA precipitation was avoided by using Pb:EDTA in the mole ratio >1:2.5 and flash pyrolyzing the PMN-EDTA solution at 225 °C. Consequently, the PMN yield increased from 80 to 98 wt%. The sequential decomposition of Pb-EDTA, Mg-EDTA, and peroxo-citrato-Nb in the PMN-EDTA precursor in 1 vol% O2 leads to phase separation of Pb and PbO and thus lowers the PMN yield to 92 wt%. At PO(2)>2.5 vol% the Pb, Mg, and Nb complexes cothermolyze to form ≥97% perovskite PMN. The presence of a heterometallic citrato-Pb-Mg-Nb complex in PMN-citrate leads to oxygen partial pressure independent codecomposition of the Pb, Mg, and Nb complexes. Accordingly, PMN yields of ≥96 wt% were obtained from the PMN-citrate precursor for oxygen partial pressures between 1 and 5 vol%.

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