Variable-temperature electron spin resonance of turquoise

C. O. Clark; C. P. Poole; H. A. Farach

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Other| April 01, 1979

Variable-temperature electron spin resonance of turquoise

C. O. Clark;

C. O. Clark

S.C. State Coll., Dep. Nat. Sci., Orangeburg, S.C., United States

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C. P. Poole;

C. P. Poole

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H. A. Farach

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Author and Article Information

C. O. Clark

S.C. State Coll., Dep. Nat. Sci., Orangeburg, S.C., United States

C. P. Poole

H. A. Farach

Publisher: Mineralogical Society of America

First Online: 03 Mar 2017

Online ISSN: 1945-3027

Print ISSN: 0003-004X

American Mineralogist (1979) 64 (3-4): 449–451.

Abstract

The ESR spectra of several turquoise specimens contained an anisotropic component which was due to Cu²⁺ and an isotropic component arising from Fe³⁺ ions. The Fe/Cu concentration ratio obtained from these measurements agreed with ratios obtained analytically. A variable-temperature study from 77 K to 560 K indicated that the cupric ions are paramagnetic while the ferric ions behave antiferromagnetically at low temperatures.

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