Synthesis, crystal growth and characterization of the pyrochlore Er 2 Ti 2 O 7

Wang, Q.; Ghasemi, A.; Scheie, A.; Koohpayeh, S. M.

doi:10.1039/c8ce01885e

Synthesis, crystal growth and characterization of the pyrochlore Er ₂ Ti ₂ O ₇

Journal Article · 01 January 2019 · CrystEngComm

DOI:https://doi.org/10.1039/c8ce01885e· OSTI ID:1566631

^[1]; Ghasemi, A. ^[1]; Scheie, A. ^[1]; Koohpayeh, S. M. ^[1]

Institute for Quantum Matter; Department of Physics and Astronomy; Johns Hopkins University; Baltimore; USA

Pyrochlore erbium titanate samples in the form of powders (with nominal compositions of Er₂Ti_2+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(Ti_2-xEr_x)O_7-δ, while Ti-rich anti-stuffed powders, (Er_2-xTi_x)Ti₂O_7+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 T_c of ~1.23 K that was suppressed in off-stoichiometric samples, demonstrating correlations between the stoichiometry and ground state magnetism in Er₂Ti₂O₇.

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: SC0019331

OSTI ID:: 1566631

Journal Information:: CrystEngComm, Vol. 21, Issue 4; ISSN 1466-8033

Publisher:: Royal Society of Chemistry

Country of Publication:: United States

Language:: English

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