Microwave induced magnetic decrystallization

Stephen M. Copley; Ramesh Peelamedu; Dinesh Agrawal; Rustum Roy

Microwave induced magnetic decrystallization

Stephen M. Copley, Ramesh Peelamedu, Dinesh Agrawal, Rustum Roy

Materials Research Institute (MRI)

Research output: Contribution to conference › Paper › peer-review

Abstract

A number of crystalline materials in powder form containing magnetic ions have been decrystallized by exposing them to a 2.45 GHz single mode, quasi-pure magnetic field. Irradiations were carried out by placing samples at the specific location in a microwave cavity tuned to the TE₁₀₃ mode where the magnetic field is maximized and the electric field is minimized. After irradiation, the samples sintered but retained their shape (there was no evidence of macroscopic flow); however, XRD and Raman analysis indicated a complete loss of crystallinity. These observations raise several questions: How is electromagnetic energy absorbed in this process? How is it stored? How is decrystallization induced by the microwave magnetic field? This paper presents our current understanding of this remarkable phenomenon.

Original language	English (US)
Number of pages	1
State	Published - Dec 1 2004
Event	2004 AIChE Annual Meeting - Austin, TX, United States Duration: Nov 7 2004 → Nov 12 2004

Other

Other	2004 AIChE Annual Meeting
Country	United States
City	Austin, TX
Period	11/7/04 → 11/12/04

All Science Journal Classification (ASJC) codes

Engineering(all)

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title = "Microwave induced magnetic decrystallization",

abstract = "A number of crystalline materials in powder form containing magnetic ions have been decrystallized by exposing them to a 2.45 GHz single mode, quasi-pure magnetic field. Irradiations were carried out by placing samples at the specific location in a microwave cavity tuned to the TE103 mode where the magnetic field is maximized and the electric field is minimized. After irradiation, the samples sintered but retained their shape (there was no evidence of macroscopic flow); however, XRD and Raman analysis indicated a complete loss of crystallinity. These observations raise several questions: How is electromagnetic energy absorbed in this process? How is it stored? How is decrystallization induced by the microwave magnetic field? This paper presents our current understanding of this remarkable phenomenon.",

author = "Copley, {Stephen M.} and Ramesh Peelamedu and Dinesh Agrawal and Rustum Roy",

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note = "2004 AIChE Annual Meeting ; Conference date: 07-11-2004 Through 12-11-2004",

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T1 - Microwave induced magnetic decrystallization

AU - Copley, Stephen M.

AU - Peelamedu, Ramesh

AU - Agrawal, Dinesh

AU - Roy, Rustum

PY - 2004/12/1

Y1 - 2004/12/1

N2 - A number of crystalline materials in powder form containing magnetic ions have been decrystallized by exposing them to a 2.45 GHz single mode, quasi-pure magnetic field. Irradiations were carried out by placing samples at the specific location in a microwave cavity tuned to the TE103 mode where the magnetic field is maximized and the electric field is minimized. After irradiation, the samples sintered but retained their shape (there was no evidence of macroscopic flow); however, XRD and Raman analysis indicated a complete loss of crystallinity. These observations raise several questions: How is electromagnetic energy absorbed in this process? How is it stored? How is decrystallization induced by the microwave magnetic field? This paper presents our current understanding of this remarkable phenomenon.

AB - A number of crystalline materials in powder form containing magnetic ions have been decrystallized by exposing them to a 2.45 GHz single mode, quasi-pure magnetic field. Irradiations were carried out by placing samples at the specific location in a microwave cavity tuned to the TE103 mode where the magnetic field is maximized and the electric field is minimized. After irradiation, the samples sintered but retained their shape (there was no evidence of macroscopic flow); however, XRD and Raman analysis indicated a complete loss of crystallinity. These observations raise several questions: How is electromagnetic energy absorbed in this process? How is it stored? How is decrystallization induced by the microwave magnetic field? This paper presents our current understanding of this remarkable phenomenon.

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T2 - 2004 AIChE Annual Meeting

Y2 - 7 November 2004 through 12 November 2004

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