Chem-prep PZT95/5 for neutron generator applications : the effect of pore former type and density on the depoling behavior of chemically prepared PZT 95/5 ceramics.

Lockwood, Steven John ; Scofield, Timothy W. ; Yang, Pin ; Voigt, James A. ; Tuttle, Bruce Andrew ; Moore, Roger Howard

Sandia National Laboratories

关键词: Chemical Preparation;    Density;    Ferroelectric Materials;    36 Materials Science;    Pzt;   

DOI  :  10.2172/918302
RP-ID  :  SAND2003-3866
RP-ID  :  AC04-94AL85000
RP-ID  :  918302

美国|英语

来源: UNT Digital Library

【 摘 要 】

The hydrostatically induced ferroelectric(FE)-to-antiferroelectric(AFE) phase transformation for chemically prepared niobium modified PZT 95/5 ceramics was studied as a function of density and pore former type (Lucite or Avicel). Special attention was placed on the effect of different pore formers on the charge release behavior associated with the FE-to-AFE phase transformation. Within the same density range (7.26 g/cm3 to 7.44 g/cm3), results showed that ceramics prepared with Lucite pore former exhibit a higher bulk modulus and a sharper polarization release behavior than those prepared with Avicel. In addition, the average transformation pressure was 10.7% greater and the amount of polarization released was 2.1% higher for ceramics with Lucite pore former. The increased transformation pressure was attributed to the increase of bulk modulus associated with Lucite pore former. Data indicated that a minimum volumetric transformational strain of -0.42% was required to trigger the hydrostatically induced FE-to-AFE phase transformation. This work has important implications for increasing the high temperature charge output for neutron generator power supply units.