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

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.

Authors:
ORCiD logo [1];  [1];  [1];  [1]
  1. Institute for Quantum Matter; Department of Physics and Astronomy; Johns Hopkins University; Baltimore; USA
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Institute for Quantum Matter (IQM); Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1566631
DOE Contract Number:  
SC0019331
Resource Type:
Journal Article
Journal Name:
CrystEngComm
Additional Journal Information:
Journal Volume: 21; Journal Issue: 4; Journal ID: ISSN 1466-8033
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
optics, thermal conductivity, defects, charge transport, superconductivity, magnetism and spin physics, quantum information science, materials and chemistry by design, synthesis (novel materials)

Citation Formats

Wang, Q., Ghasemi, A., Scheie, A., and Koohpayeh, S. M. Synthesis, crystal growth and characterization of the pyrochlore Er 2 Ti 2 O 7. United States: N. p., 2019. Web. doi:10.1039/c8ce01885e.
Wang, Q., Ghasemi, A., Scheie, A., & Koohpayeh, S. M. Synthesis, crystal growth and characterization of the pyrochlore Er 2 Ti 2 O 7. United States. doi:10.1039/c8ce01885e.
Wang, Q., Ghasemi, A., Scheie, A., and Koohpayeh, S. M. Tue . "Synthesis, crystal growth and characterization of the pyrochlore Er 2 Ti 2 O 7". United States. doi:10.1039/c8ce01885e.
@article{osti_1566631,
title = {Synthesis, crystal growth and characterization of the pyrochlore Er 2 Ti 2 O 7},
author = {Wang, Q. and Ghasemi, A. and Scheie, A. and Koohpayeh, S. M.},
abstractNote = {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.},
doi = {10.1039/c8ce01885e},
journal = {CrystEngComm},
issn = {1466-8033},
number = 4,
volume = 21,
place = {United States},
year = {2019},
month = {1}
}

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