Study of the formation of bi2te4o11

Zs Szaller, L. Pöppl, Gy Lovas, I. Dódony

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The solid state reaction in a 1:4 mole ratio mixture of Bi2O3 and TeO2 and the polymorphic phase transition of Bi2Te4O11 have been investigated using differential scanning calorimetry (DSC), electron microprobe, X-ray powder diffraction (XPD), and selected area electron diffraction (SAED) analysis in the 25-730°C temperature range. Upon heating first a 8Bi2Te4O11 + 23TeO2 eutectic is formed, which melts at 598.9°C. In this melt the excess of Bi2O3 reacts further and the Bi2O3 + 4TeO2 = Bi2Te4O11 reaction takes place. The cubic modification is formed by fast crystallization of the Bi2Te4O11 melt. The structure of the cubic Bi2Te4O11 can be characterized by the lattice constant of a = 5.6397(5) Å and space group Fm3m. The main product of a slow cooling is the same cubic polymorph although a subordinate formation of the monoclinic phase is also observed. The β-Bi2Te4O11 cubic phase undergoes a monotropic transformation into the α-Bi2Te4O11 monoclinic modification at temperatures higher than 400°C. The cubic → monoclinic transition is the result of an ordering in one set of {111} planes and the orthogonality of the cubic phase in the [110] projection changes to monoclinic symmetry. The melting enthalpies of the cubic β-phase and the monoclinic α-phase are 35.9 ± 3.3 J/g and 84.3 ± 4.3 J/g respectively.

Original languageEnglish
Pages (from-to)251-261
Number of pages11
JournalJournal of Solid State Chemistry
Volume121
Issue number2
DOIs
Publication statusPublished - Feb 1 1996

Fingerprint

orthogonality
Crystallization
Polymorphism
Solid state reactions
Electron diffraction
eutectics
X ray powder diffraction
Eutectics
Lattice constants
Differential scanning calorimetry
Enthalpy
Melting
heat measurement
electron diffraction
Phase transitions
enthalpy
projection
melting
crystallization
Cooling

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Study of the formation of bi2te4o11 . / Szaller, Zs; Pöppl, L.; Lovas, Gy; Dódony, I.

In: Journal of Solid State Chemistry, Vol. 121, No. 2, 01.02.1996, p. 251-261.

Research output: Contribution to journalArticle

Szaller, Zs ; Pöppl, L. ; Lovas, Gy ; Dódony, I. / Study of the formation of bi2te4o11 In: Journal of Solid State Chemistry. 1996 ; Vol. 121, No. 2. pp. 251-261.
@article{751577d10ac046cfb880598793b9b41f,
title = "Study of the formation of bi2te4o11",
abstract = "The solid state reaction in a 1:4 mole ratio mixture of Bi2O3 and TeO2 and the polymorphic phase transition of Bi2Te4O11 have been investigated using differential scanning calorimetry (DSC), electron microprobe, X-ray powder diffraction (XPD), and selected area electron diffraction (SAED) analysis in the 25-730°C temperature range. Upon heating first a 8Bi2Te4O11 + 23TeO2 eutectic is formed, which melts at 598.9°C. In this melt the excess of Bi2O3 reacts further and the Bi2O3 + 4TeO2 = Bi2Te4O11 reaction takes place. The cubic modification is formed by fast crystallization of the Bi2Te4O11 melt. The structure of the cubic Bi2Te4O11 can be characterized by the lattice constant of a = 5.6397(5) {\AA} and space group Fm3m. The main product of a slow cooling is the same cubic polymorph although a subordinate formation of the monoclinic phase is also observed. The β-Bi2Te4O11 cubic phase undergoes a monotropic transformation into the α-Bi2Te4O11 monoclinic modification at temperatures higher than 400°C. The cubic → monoclinic transition is the result of an ordering in one set of {111} planes and the orthogonality of the cubic phase in the [110] projection changes to monoclinic symmetry. The melting enthalpies of the cubic β-phase and the monoclinic α-phase are 35.9 ± 3.3 J/g and 84.3 ± 4.3 J/g respectively.",
author = "Zs Szaller and L. P{\"o}ppl and Gy Lovas and I. D{\'o}dony",
year = "1996",
month = "2",
day = "1",
doi = "10.1006/jssc.1996.0036",
language = "English",
volume = "121",
pages = "251--261",
journal = "Journal of Solid State Chemistry",
issn = "0022-4596",
publisher = "Academic Press Inc.",
number = "2",

}

TY - JOUR

T1 - Study of the formation of bi2te4o11

AU - Szaller, Zs

AU - Pöppl, L.

AU - Lovas, Gy

AU - Dódony, I.

PY - 1996/2/1

Y1 - 1996/2/1

N2 - The solid state reaction in a 1:4 mole ratio mixture of Bi2O3 and TeO2 and the polymorphic phase transition of Bi2Te4O11 have been investigated using differential scanning calorimetry (DSC), electron microprobe, X-ray powder diffraction (XPD), and selected area electron diffraction (SAED) analysis in the 25-730°C temperature range. Upon heating first a 8Bi2Te4O11 + 23TeO2 eutectic is formed, which melts at 598.9°C. In this melt the excess of Bi2O3 reacts further and the Bi2O3 + 4TeO2 = Bi2Te4O11 reaction takes place. The cubic modification is formed by fast crystallization of the Bi2Te4O11 melt. The structure of the cubic Bi2Te4O11 can be characterized by the lattice constant of a = 5.6397(5) Å and space group Fm3m. The main product of a slow cooling is the same cubic polymorph although a subordinate formation of the monoclinic phase is also observed. The β-Bi2Te4O11 cubic phase undergoes a monotropic transformation into the α-Bi2Te4O11 monoclinic modification at temperatures higher than 400°C. The cubic → monoclinic transition is the result of an ordering in one set of {111} planes and the orthogonality of the cubic phase in the [110] projection changes to monoclinic symmetry. The melting enthalpies of the cubic β-phase and the monoclinic α-phase are 35.9 ± 3.3 J/g and 84.3 ± 4.3 J/g respectively.

AB - The solid state reaction in a 1:4 mole ratio mixture of Bi2O3 and TeO2 and the polymorphic phase transition of Bi2Te4O11 have been investigated using differential scanning calorimetry (DSC), electron microprobe, X-ray powder diffraction (XPD), and selected area electron diffraction (SAED) analysis in the 25-730°C temperature range. Upon heating first a 8Bi2Te4O11 + 23TeO2 eutectic is formed, which melts at 598.9°C. In this melt the excess of Bi2O3 reacts further and the Bi2O3 + 4TeO2 = Bi2Te4O11 reaction takes place. The cubic modification is formed by fast crystallization of the Bi2Te4O11 melt. The structure of the cubic Bi2Te4O11 can be characterized by the lattice constant of a = 5.6397(5) Å and space group Fm3m. The main product of a slow cooling is the same cubic polymorph although a subordinate formation of the monoclinic phase is also observed. The β-Bi2Te4O11 cubic phase undergoes a monotropic transformation into the α-Bi2Te4O11 monoclinic modification at temperatures higher than 400°C. The cubic → monoclinic transition is the result of an ordering in one set of {111} planes and the orthogonality of the cubic phase in the [110] projection changes to monoclinic symmetry. The melting enthalpies of the cubic β-phase and the monoclinic α-phase are 35.9 ± 3.3 J/g and 84.3 ± 4.3 J/g respectively.

UR - http://www.scopus.com/inward/record.url?scp=16144368190&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=16144368190&partnerID=8YFLogxK

U2 - 10.1006/jssc.1996.0036

DO - 10.1006/jssc.1996.0036

M3 - Article

VL - 121

SP - 251

EP - 261

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

SN - 0022-4596

IS - 2

ER -