Sintering of PbNb&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;6&lt;/sub&gt; with Dopants

Chong, Jia; Chaklader, A. C. D.; Prasad, E.

doi:10.4028/www.scientific.net/ssp.25-26.335

Cited by 4 publications

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“…Substitution of similar ions for lead or niobium has been studied to improve sintering characteristics and electrical properties, 34,35 and several dopants have been known to effectively improve sinterability. 36 An elaborate method by a coprecipitation process in oxalic solution is used to improve the electromechanical properties of PbNb 2 O 6 . 8 Our interest in PbNb 2 O 6 started with the idea of suppressing exaggerated grain growth in order to obtain dense ceramics without any additives.…”

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confidence: 99%

Effects of Microstructure on the Dielectric and Piezoelectric Properties of Lead Metaniobate

Lee

Kimura

1998

Journal of the American Ceramic Society

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In an attempt to obtain dense PbNb 2 O 6 ceramics, sintering experiments were conducted using starting powders with various particle sizes and different modifications (rhombohedral and orthorhombic structures). During sintering of rhombohedral powders, the phase transformation to the tetragonal phase promoted grain growth, resulting in poor densification. Sintering of orthorhombic powders, however, yielded dense ceramics through suppression of the phase transformation. Based on these results, ceramics with various densities and different microstructures were prepared, and their dielectric and piezoelectric properties were evaluated. The dielectric constant and Curie temperature were dependent on density, grain size, and crack density. Cracks and intragrain pores severely deteriorated the piezoelectric properties. Dense ceramics with the maximum coupling factors and piezoelectric strain constants were obtained by prolonged heating of a fine powder with orthorhombic structure.

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