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Structural phase transition in Zn1.98Mn0.02P2O7: EPR evidence for enhanced line broadening and large zero-field splitting parameter in high temperature phase

Published online by Cambridge University Press:  11 November 2013

Santosh K. Gupta ,
Ramakant Mahadeo Kadam ,
Pradeep Samui ,
Krishnan Kesavaiyer ,
Venkataraman Natarajan  and
Shrikant Vasant Godbole
Santosh K. Gupta*
Affiliation:
Radiochemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
Ramakant Mahadeo Kadam
Affiliation:
Radiochemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
Pradeep Samui
Affiliation:
Product Development Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
Krishnan Kesavaiyer
Affiliation:
Fuel Chemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
Venkataraman Natarajan
Affiliation:
Radiochemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
Shrikant Vasant Godbole
Affiliation:
Radiochemistry Division, Bhabha Atomic Research Center, Trombay, Mumbai-400085, India
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Zn1.98Mn0.02P2O7 was synthesized by the wet chemical route. The purity of the phase and the oxidation state of manganese ion were investigated by x-ray diffraction (XRD) and electron paramagnetic resonance (EPR). Structural phase transition in α-Zn2P2O7 was investigated by high-temperature XRD (HTXRD), differential scanning calorimetry (DSC), and EPR studies. There is a distinct signature of phase transitions between 390 and 400 K in our powder sample by EPR and HTXRD. There was a sharp reduction in the volume of unit cell, while going from alpha to beta phase; with discontinuity in 405 K, which confirmed the transition to be of first order. Similarly, the effect of temperature on zero-field splitting parameter (D) also showed that there is a sudden jump (discontinuity) in the value at around 400 K (phase transition temperature) confirming the transition to be of first order. DSC studies corroborated these findings.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 22 , 28 November 2013 , pp. 3157 - 3163
Copyright
Copyright © Materials Research Society 2013 

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References

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