Mössbauer spectroscopic study of the thermal spin crossover in [Fe(II)(isoxazole)6](ClO4)2

A. Bhattacharjee, P.J. Van Koningsbruggen, J.S. Miller, P. Gütlich

Research output: Contribution to journalArticle

Abstract

The Fe Mössbauer spectroscopy of mononuclear [Fe(II)(isoxazole)](ClO) has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. Temperaturedependent spin transition curves have been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures between 84 and 270 K during a cooling and heating cycle. This compound exhibits an unusual temperature-dependent spin transition behaviour with T(?) = 223 and T(?) = 213 K occurring in the reverse order in comparison to those observed in SQUID observation and many other spin transition compounds. The compound has three high-spin Fe(II) sites at the highest temperature of study of which two undergo spin transitions. The compound seems to undergo a structural phase transition around the spin transition temperature, which plays a significant role in the spin crossover behaviour as well as the magnetic properties of the compound at temperatures below T. The present study reveals an increase in high-spin fraction upon heating in the temperature range below T, and an explanation is provided.
Original languageEnglish
Pages (from-to)2713-2718
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number11
Early online date3 Jul 2008
DOIs
Publication statusPublished - Nov 2008

Fingerprint

Isoxazoles
crossovers
Temperature
Heating
SQUIDs
Superconducting transition temperature
Magnetic properties
Phase transitions
perchlorate
Hot Temperature
Spectroscopy
Cooling
spin temperature
heating
temperature
transition temperature
magnetic properties

Keywords

  • inorganic compounds
  • Mössbauer spectroscopy
  • magnetic properties
  • phase transitions

Cite this

@article{3fa10108532a46ada4133142ff16ef35,
title = "M{\"o}ssbauer spectroscopic study of the thermal spin crossover in [Fe(II)(isoxazole)6](ClO4)2",
abstract = "The Fe M{\"o}ssbauer spectroscopy of mononuclear [Fe(II)(isoxazole)](ClO) has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. Temperaturedependent spin transition curves have been constructed with the least-square fitted data obtained from the M{\"o}ssbauer spectra measured at various temperatures between 84 and 270 K during a cooling and heating cycle. This compound exhibits an unusual temperature-dependent spin transition behaviour with T(?) = 223 and T(?) = 213 K occurring in the reverse order in comparison to those observed in SQUID observation and many other spin transition compounds. The compound has three high-spin Fe(II) sites at the highest temperature of study of which two undergo spin transitions. The compound seems to undergo a structural phase transition around the spin transition temperature, which plays a significant role in the spin crossover behaviour as well as the magnetic properties of the compound at temperatures below T. The present study reveals an increase in high-spin fraction upon heating in the temperature range below T, and an explanation is provided.",
keywords = "inorganic compounds, M{\"o}ssbauer spectroscopy, magnetic properties, phase transitions",
author = "A. Bhattacharjee and {Van Koningsbruggen}, P.J. and J.S. Miller and P. G{\"u}tlich",
note = "Copyright 2008 Elsevier B.V., All rights reserved.",
year = "2008",
month = "11",
doi = "10.1016/j.jpcs.2008.06.141",
language = "English",
volume = "69",
pages = "2713--2718",
journal = "Journal of Physics and Chemistry of Solids",
issn = "0022-3697",
publisher = "Elsevier",
number = "11",

}

Mössbauer spectroscopic study of the thermal spin crossover in [Fe(II)(isoxazole)6](ClO4)2. / Bhattacharjee, A.; Van Koningsbruggen, P.J.; Miller, J.S.; Gütlich, P.

In: Journal of Physics and Chemistry of Solids, Vol. 69, No. 11, 11.2008, p. 2713-2718.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Mössbauer spectroscopic study of the thermal spin crossover in [Fe(II)(isoxazole)6](ClO4)2

AU - Bhattacharjee, A.

AU - Van Koningsbruggen, P.J.

AU - Miller, J.S.

AU - Gütlich, P.

N1 - Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2008/11

Y1 - 2008/11

N2 - The Fe Mössbauer spectroscopy of mononuclear [Fe(II)(isoxazole)](ClO) has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. Temperaturedependent spin transition curves have been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures between 84 and 270 K during a cooling and heating cycle. This compound exhibits an unusual temperature-dependent spin transition behaviour with T(?) = 223 and T(?) = 213 K occurring in the reverse order in comparison to those observed in SQUID observation and many other spin transition compounds. The compound has three high-spin Fe(II) sites at the highest temperature of study of which two undergo spin transitions. The compound seems to undergo a structural phase transition around the spin transition temperature, which plays a significant role in the spin crossover behaviour as well as the magnetic properties of the compound at temperatures below T. The present study reveals an increase in high-spin fraction upon heating in the temperature range below T, and an explanation is provided.

AB - The Fe Mössbauer spectroscopy of mononuclear [Fe(II)(isoxazole)](ClO) has been studied to reveal the thermal spin crossover of Fe(II) between low-spin (S = 0) and high-spin (S = 2) states. Temperaturedependent spin transition curves have been constructed with the least-square fitted data obtained from the Mössbauer spectra measured at various temperatures between 84 and 270 K during a cooling and heating cycle. This compound exhibits an unusual temperature-dependent spin transition behaviour with T(?) = 223 and T(?) = 213 K occurring in the reverse order in comparison to those observed in SQUID observation and many other spin transition compounds. The compound has three high-spin Fe(II) sites at the highest temperature of study of which two undergo spin transitions. The compound seems to undergo a structural phase transition around the spin transition temperature, which plays a significant role in the spin crossover behaviour as well as the magnetic properties of the compound at temperatures below T. The present study reveals an increase in high-spin fraction upon heating in the temperature range below T, and an explanation is provided.

KW - inorganic compounds

KW - Mössbauer spectroscopy

KW - magnetic properties

KW - phase transitions

UR - http://www.scopus.com/inward/record.url?scp=55349113904&partnerID=8YFLogxK

U2 - 10.1016/j.jpcs.2008.06.141

DO - 10.1016/j.jpcs.2008.06.141

M3 - Article

VL - 69

SP - 2713

EP - 2718

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

SN - 0022-3697

IS - 11

ER -