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Issue 4, 2019
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Synthesis, crystal growth and characterization of the pyrochlore Er2Ti2O7

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Abstract

Pyrochlore erbium titanate samples in the form of powders (with nominal compositions of Er2Ti2+xO7, −0.08 ≤ x ≤ 0.08) and bulk single crystals were prepared to elucidate the effect of synthesis and growth conditions on their composition, structure, and transition temperature. All the samples were characterized using X-ray diffraction and specific heat measurements. Larger lattice parameters were measured for Ti-deficient stuffed powders, Er2(Ti2−xErx)O7−δ, while Ti-rich anti-stuffed powders, (Er2−xTix)Ti2O7+δ, showed a decrease in the lattice parameter. The lattice parameter for the stoichiometrically synthesized powder, Er2Ti2O7, was measured to be a = 10.07522(9) Å. Single crystals grown by the conventional floating zone (FZ) technique were Ti deficient (stuffed) and darker in color due to oxygen vacancies. Using the traveling solvent floating zone (TSFZ) method, a high structural quality, transparent and stoichiometric Er2Ti2O7 single crystal was grown at a lower temperature using the TiO2 solvent. The heat capacity measurements of the TSFZ grown Er2Ti2O7 crystal and stoichiometric powder exhibited a very close magnetic transition temperature Tc of ∼1.23 K that was suppressed in off-stoichiometric samples, demonstrating correlations between the stoichiometry and ground state magnetism in Er2Ti2O7.

Graphical abstract: Synthesis, crystal growth and characterization of the pyrochlore Er2Ti2O7

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Publication details

The article was received on 03 Nov 2018, accepted on 12 Dec 2018 and first published on 13 Dec 2018


Article type: Paper
DOI: 10.1039/C8CE01885E
Citation: CrystEngComm, 2019,21, 703-709
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    Synthesis, crystal growth and characterization of the pyrochlore Er2Ti2O7

    Q. Wang, A. Ghasemi, A. Scheie and S. M. Koohpayeh, CrystEngComm, 2019, 21, 703
    DOI: 10.1039/C8CE01885E

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