The low frequency internal friction and electric magnetic properties in La0.7Pb0.3MnO3 bulk materials

Li, H.Q; Fang, Qingming; Zhang, Zhengang

doi:10.1016/j.msea.2003.05.001

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2005

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“…28 Internal friction and elastic modulus measurements have been made on doped manganites but rather in the low-temperature range. 22,24,30,31 These studies show that very often two peaks associated with a modulus softening appear at low temperature. These peaks are typical of a phase transition: indeed, they do not shift with frequency.…”

Section: Discussionmentioning

confidence: 83%

Internal friction investigation of phase transformation in nearly stoichiometric LaMnO3+δ

Zenati¹,

Bernard²,

Calmet³

et al. 2005

Journal of the European Ceramic Society

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Rhombohedral LaMnO 3+δ powders, prepared by two different soft chemistry routes (co-precipitation and hydrothermal synthesis), are sintered at 1400 • C for 2 h in air. Measurements of internal friction Q −1 (T) and shear modulus G(T), at low frequencies from −180 to 700 • C under vacuum, evidence three structural transitions of nearly stoichiometric orthorhombic LaMnO 3+δ . The first one, at 250 or 290 • C, depending on the processing followed, is associated to either a Jahn-Teller structural transition or a phase transformation from orthorhombic to pseudo-cubic. The second one at 610 or 630 • C is related to a phase transformation from pseudo-cubic or orthorhombic to rhombohedral. Below the Neel temperature, around −170 • C, a relaxation peak could be associated, for samples prepared according to both processing routes, to the motion of Weiss domains.

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