Ion exchange properties of β-eucryptite (LiAlSiO4): EPR investigation on copper-doped single crystals

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Abstract

Investigation of the ion exchange properties of β-eucryptite (LiAlSiO4) single crystals indicates that it is impossible to substitute Li+ by other bigger univalent cations such as Na+, K+, or Ag+. On the contrary, Li+ exchange by bivalent cations, Cu2+ or Mn2+, is very easy. For a general orientation of the crystal with respect to the magnetic field, the EPR spectrum of Cu2+ ions in β-eucryptite consists of 12 sharp lines partially superimposed on a broad line. The sharp lines are attributed to isolated copper ions in the conducting channels. Cu2+ lies in sixfold coordinated Li″ sites, but not in the fourfold coordinated Li″ sites. The corresponding spin Hamiltonian parameters at T = 140 K are found to be: gx = 2.362, gy = 2.340, gz = 1.990; ∥Ax∥ = 85 × 10−4cm−1, ∥Ay∥ = 71 × 10−4cm−1, ∥Az∥ = 203 × 10−4 cm−1. The broad line is attributed to clusters of Cu2+ located in neighboring Li″ sites. © 1980, All rights reserved.

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Berchot, J. L., Vivien, D., Gourier, D., Thery, J., & Collongues, R. (1980). Ion exchange properties of β-eucryptite (LiAlSiO4): EPR investigation on copper-doped single crystals. Journal of Solid State Chemistry, 34(2), 199–205. https://doi.org/10.1016/0022-4596(80)90222-4

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