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Volumn 101, Issue 10, 2007, Pages

Landau thermodynamic potential for BaTiO3

Author keywords

[No Author keywords available]

Indexed keywords

DIELECTRIC PROPERTIES; ELECTRIC FIELD EFFECTS; FREE ENERGY; SINGLE CRYSTALS;

EID: 34249935033     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2733744     Document Type: Article
Times cited : (106)

References (26)
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    • The adiabatic correction to the dielectric permittivity measured by the ac method, which might affect the value of R, is negligible for BaTiO3, according to Ref. 12.
    • The adiabatic correction to the dielectric permittivity measured by the ac method, which might affect the value of R, is negligible for BaTiO3, according to Ref..
  • 19
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    • In literature (Ref. 14), the second quartic coefficient , was determined by fitting the P-E curves along [001] and [011] directions in the paraelectric phase. Neglecting the high-power terms, Phkl = κhkl Ehkl + λhkl E hkl 3, and - Βhkl = λhkl ε4. As determined λ001 and λ011 both have positive values above TC. Keeping in mind that the birefringence are proportional to the square of the polarization, Δn P2 = κ2 E2 +2κλ E4 +, one would expect that the nonlinear coefficient d2 in Δn= d1 E2 + d2 E4 + have the same sign as λ for both directions as κ001 = κ011. However, the birefringence measurements evidenced positive d2 [001] whereas negative d2 [011] over the same temperature interval, contradicting to that predicted by λ values.
    • In literature (Ref.), the second quartic coefficient, was determined by fitting the P-E curves along [001] and [011] directions in the paraelectric phase. Neglecting the high-power terms, Phkl = κhkl Ehkl + λhkl E hkl 3, and - Βhkl = λhkl ε4. As determined λ001 and λ011 both have positive values above TC. Keeping in mind that the birefringence are proportional to the square of the polarization, Δn P2 = κ2 E2 +2κλ E4 +, one would expect that the nonlinear coefficient d2 in Δn= d1 E2 + d2 E4 + have the same sign as λ for both directions as κ001 = κ011. However, the birefringence measurements evidenced positive d2 [001] whereas negative d2 [011] over the same temperature interval, contradicting to that predicted by λ values.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.