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Search Publications by: Peter M. Gehring (Fed)

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Displaying 26 - 37 of 37

Role of Random Electric Fields in Relaxors

February 14, 2014
Author(s)
Daniel P. Phelan, Christopher Stock, Jose Rodriguez Rivera, Songxue Chi, Juscelino Leao, Xifa Long, Yujuan Xie, Alexei A. Bokov, Zuo-Guang Ye, Panchapakesan Ganesh, Peter M. Gehring
Pb(Zr 1¿xTi x)O 3 (PZT) and Pb[(Mg 1/3Nb 2/3) 1¿xTi x]O 3 (PMN-xPT) are complex lead-oxide perovskites that display exceptional piezoelectric properties for pseudo-rhombohedral compositions near a tetragonal phase boundary. In PZT these compositions are

Constraints on the Possible Long-Range Orbital Ordering in LaCoO 3

January 1, 2014
Author(s)
Daniel P. Phelan, Peter M. Gehring
A neutron powder diffraction measurement was performed to distinguish between the proposed monoclinic (I2/a) structure of LaCoO 3, which is consistent with orbital ordering, and the rhombohedral (R3c) structure, which is inconsistent with orbital ordering

Lead-free and Lead-Based ABO 3 Perovskite Relaxors with Mixed-Valence A-Site and B-Site Disorder: A Comparative Neutron Scattering Structural Study of (NaYd1/2^Bi 1/2)TiO d3^ and Pb(MgYd1/3^Nb 2/3 )O 3

November 27, 2013
Author(s)
Wenwei Ge, Christopher P. Devreugd, Daniel Phelan, Qinhui Zhang, Muhtar Ahart, Jiefang Li, Haosu Luo, Lynn A. Boatner, Dwight Viehland, Peter M. Gehring
We report the results of neutron elastic scattering measurements between -250°C and 620°C on the lead-free relaxor Na 1/2Bi 1/2TiO 3 (NBT). Strong, anisotropic, elastic diffuse scattering intensity decorates the (100), (110), (111), (200), (220), and (210)

Evidence for Anisotropic Polar Nanoregions in Relaxor Pb(Mg 1/3} Nb 2/3} )O 3 : A Neutron Study of the Elastic Constants and Anomalous TA Phonon Damping in PMN

September 18, 2012
Author(s)
Christopher K. Stock, Peter M. Gehring, H. Hiraka, I. Swainson, Guangyong Xu, Z.-G. Ye, J.-F. Li, D. Viehland
We use neutron inelastic scattering methods to characterize the acoustic phonons in the relaxor Pb(Mg 1/3}Nb 2/3})O 3 (PMN) and demonstrate the presence of a highly anisotropic damping mechanism that is directly related to short-range, polar correlations

Single Crystal Study of Competing Rhombohedral and Monoclinic Order in Lead Zirconate Titanate

November 12, 2010
Author(s)
Daniel P. Phelan, X. Long, Y. Xie, Z.-G. Ye, A. M. Glazer, H. Yokota, P. A. Thomas, Peter M. Gehring
Neutron diffraction measurements were performed on single crystals of PbZr 1¿xTi xO 3 (PZT)with x=0.325 and x=0.460. The data refute the thesis that the ferroelectric phases of PZT within this composition range, all of which are strongly piezoelectric, are