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Professor Harmer’s early pioneering work on the control of microchemical ordering
and domain structures in lead-based relaxor ferroelectrics is widely appreciated and highly
cited. Dr. Harmer became engaged in research on relaxor ferroelectrics after spending a short
sabbatical leave working with Professor L. Eric Cross at The Pennsylvania State University in
the early eighties. He published the first direct observations of thermally induced
microchemically ordered domain structures in the model relaxor material lead scandium
tantalate (PST). His most highly cited work (591 citations currently) is the paper that he
published with his colleague Dr. Chan and his graduate student Jie Chen on the control of
microchemical ordering in the classic prototypical relaxor ferroelectric system lead
magnesium niobate (PMN). This fundamental work demonstrated for the first time how the
degree of microchemical domain ordering in PMN could be controlled (promoted or
suppressed) in a highly systematic manner, by controlled doping with either Na and/or La on
the A-sites, with corresponding adjustments in the Mg/Nb ratio. This classic work also
confirmed that the ordered arrangement of the nanodomains in PMN represented a doubling
of the unit cell (so-called 1:1 ordering), which could be explained by two alternative models
of 1:1 ordering sequences (the so-called space charge and stoichiometric ordering models).
The same ideas were extended to barium based perovskite materials (such as BZN) important
for microwave communications. These fundamental ordering studies have helped to lay the
foundation for understanding how to engineer cation ordering in perovskites in general, which
has had a major impact on the ability to engineer new electroceramic materials with superior
performance
and domain structures in lead-based relaxor ferroelectrics is widely appreciated and highly
cited. Dr. Harmer became engaged in research on relaxor ferroelectrics after spending a short
sabbatical leave working with Professor L. Eric Cross at The Pennsylvania State University in
the early eighties. He published the first direct observations of thermally induced
microchemically ordered domain structures in the model relaxor material lead scandium
tantalate (PST). His most highly cited work (591 citations currently) is the paper that he
published with his colleague Dr. Chan and his graduate student Jie Chen on the control of
microchemical ordering in the classic prototypical relaxor ferroelectric system lead
magnesium niobate (PMN). This fundamental work demonstrated for the first time how the
degree of microchemical domain ordering in PMN could be controlled (promoted or
suppressed) in a highly systematic manner, by controlled doping with either Na and/or La on
the A-sites, with corresponding adjustments in the Mg/Nb ratio. This classic work also
confirmed that the ordered arrangement of the nanodomains in PMN represented a doubling
of the unit cell (so-called 1:1 ordering), which could be explained by two alternative models
of 1:1 ordering sequences (the so-called space charge and stoichiometric ordering models).
The same ideas were extended to barium based perovskite materials (such as BZN) important
for microwave communications. These fundamental ordering studies have helped to lay the
foundation for understanding how to engineer cation ordering in perovskites in general, which
has had a major impact on the ability to engineer new electroceramic materials with superior
performance
研究兴趣
论文共 381 篇作者统计合作学者相似作者
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Mari-Therese S. Burton,B. Chad Hornbuckle,Vincent H. Hammond,Kristopher A. Darling,Helen M. Chan, Christopher J. Marvel,Martin P. Harmer
Metallurgical and Materials Transactions App.1-13, (2024)
Qirong Yang,Christopher J. Marvel,Yidi Shen,Mo-Rigen He,Jun Du,Chawon Hwang, Eric D. Gronske,Kelvin Y. Xie, Steven R. Mercurio,Qi An,Martin P. Harmer,Kevin J. Hemker,
Microscopy and Microanalysisno. S1 (2022): 3172-3173
Social Science Research Network (2022)
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