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Spontaneous polarization as the most immediate parameter in ferroelectricity is always an emphasis in ferroelectric research. Some ferroelectric microscopic theory such as Berry-phase method and first principles calculation are used to study the spontaneous polarization of perovskite type ferroelectrics. SrBi4Ti4O15 is a typical bismuth layered structure ferroelectric, the complexity of its crystal structure makes the ferroelectric research more difficult. This study, from the perspective of chemical bond, analyzes the relationship between the chemical bond properties and the spontaneous polarization, and further explores the atomic bonding state in ferroelectric crystal and its impact on ferroelectricity.By starting from the crystal structure data of SrBi4Ti4O15, the atomic local cluster structure including bond length, atomic coordination situation and the number of atoms in a crystal structure unit are obtained by the atomic environment calculation (AEC). Calculation results show that there are 13 atomic local cluster structures in SrBi4Ti4O15. Then combined with the crystal decomposition method, the SrBi4Ti4O15crystal is decomposed into 38 pseudo-binary crystals, and each pseudo-binary crystal corresponds to a chemical bond. Accordding to the dielectric theory of chemical bond that used in binary crystal, chemical bond properties such as the number of effective valence electron, the effective valence electron density and the bond ionicity are calculated. Through improvement of the bond dipole moment model, the relationship among bond dipole moment, bond properties, and bond parameter is established, and the bond dipole moment of each bond in SrBi4Ti4O15 is calculated.The spontaneous polarization of an ferroelectric can be approximated as the superposition of the spontaneous polarization of various chemical bonds in the crystal, where the spontaneous polarization of chemical bond is due to the bond dipole moment. Based on the traditional polarization theory, the spontaneous polarization can be expressed as the average bond dipole moment per unit volume, and considering the number of molecules in unit cell (Z) and the atomic site occupation factor (SOF), the correlation between bond dipole moment and spontaneous polarization of the bismuth layered ferroelectrics is established. On the basis of this, the calculated spontaneous polarization along a axis in the ferroelectric SrBi4Ti4O15 is 28.03 C/cm2.This study simplifies the complex crystal research by AEC and crystal decomposition method, and studies the ferroelectricity of the bismuth layered ferroelectrics from the viewpoint of chemical bond. The bond dipole moment as the bridge in this study for connecting spontaneous polarization with chemical bond properties, which is a new micro study method in macro-properties of bismuth layered ferroelectrics. Based on this method, the spontaneous polarization of other relevant ferroelectrics such as orthogonal SrBi2Ta2O9, orthogonal Bi4Ti3O12, and tetragonal SrBi4Ti4O15 are calculated, all the results are in good agreement with the experimental values and other theoretically calculated values.
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Keywords:
- atomic environment calculation /
- bismuth layered ferroelectrics /
- dielectric theory of chemical bond /
- crystal decomposition /
- spontaneous polarization
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[10] Xue W D, Chen Z Y, Yang C, Li Y R 2005 Acta Phys. Sin. 54 857 (in Chinese) [薛卫东, 陈召勇, 杨春, 李言荣 2005 物理学报 54 857]
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[22] Zhang S Y, Xue D F 2000 J. Grad. Sch. Acad. Sin. 17 36 (in Chinese) [张思远, 薛冬峰 2000 中国科学院研究生院学报 17 36]
[23] Gao F M, Gao L H 2011 J. Yanshan Univ. 35 189 (in Chinese) [高发明, 高丽华 2011 燕山大学学报 35 189]
[24] Gao F M 2004 Phys. Rev. B 69 094113
[25] Li S C 2011 Mater. Sci. Forum 689 245
[26] Brown I D, Altermatt D 1985 Acta Crystallogr. B: Struct. Sci. 41 244
[27] Schwartz M 2012 Principles of Electrodynamics (New York: Dover Publications) p45
[28] Irie H, Miyayama M, Kudo T 2001 J. Appl. Phys. 90 4089
[29] Newnham R E, Wolfe R W, Dorrian J F 1971 Mater. Res. Bull. 6 1029
[30] Goto T, Noguchi Y, Soga M, Miyayama M 2005 Mater. Res. Bull. 40 1044
[31] Amorn H, Bdikin I K, Kholkin A L, Costa M E V 2006 Phys. Solid State 48 537
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[1] Zhao M L, Wang C L, Zhong W L, Zhang P L, Wang J F 2002 Acta Phys. Sin. 51 420 (in Chinese) [赵明磊, 王春雷, 钟维烈, 张沛霖, 王矜奉 2002 物理学报 51 420]
[2] Wang C L, Wu Y Q 1980 Acta Phys. Sin. 29 1490 (in Chinese) [郭常霖, 吴毓琴 1980 物理学报 29 1490]
[3] Hervoches C H, Snedden A, Riggs R, Kilcoyne S H, Manuel P, Lightfoot P 2002 J. Solid State Chem. 164 280
[4] Irie H, Miyayama M 2001 Appl. Phys. Lett. 79 251
[5] Yin Z W 2003 Dielectric Physics (Beijing: Science Press) p29 (in Chinese) [殷之文 2003 电解质物理学(北京: 科学出版社)第29页]
[6] Chen X C 1982 Chin. Sci. Bull. 3 153 (in Chinese) [陈孝琛 1982 科学通报 3 153]
[7] King-Smith R D, Vanderbilt D 1993 Phys. Rev. B 47 1651
[8] Resta R 1994 Ferroelectrics 151 49
[9] Resta R, Posternak M, Baldereschi A 1993 Phys. Rev. Lett. 70 1010
[10] Xue W D, Chen Z Y, Yang C, Li Y R 2005 Acta Phys. Sin. 54 857 (in Chinese) [薛卫东, 陈召勇, 杨春, 李言荣 2005 物理学报 54 857]
[11] Feng H J, Liu F M 2008 Chin. Phys. B 17 1874
[12] Ke H, Wang W, Zheng Z X, Tang C L, Jia D C, Lu Z, Zhou Y 2011 J. Phys. Condens. Mat. 23 015901
[13] van Vechten J A 1969 Phys. Rev. 182 891
[14] Phillips J C, Van Vechten J A 1969 Phys. Rev. Lett. 22 705
[15] Phillips J C 1970 Rev. Mod. Phys. 42 317
[16] Phillips J C, van Vechten J A 1969 Phys. Rev. 183 709
[17] Phillips J C, van Vechten J A 1969 Phys. Rev. Lett. 23 1115
[18] Levine B F 1973 Phys. Rev. B 7 2591
[19] Levine B F 1973 J. Chem. Phys. 59 1463
[20] Zhang S Y 1991 Chin. J. Chem. Phys. 4 109 (in Chinese) [张思远 1991 化学物理学报 4 109]
[21] Zhang S Y 2005 Dielectric Theory of Chemical Bond in Complex Crystals and Its Application (Beijing: Science Press) p25 (in Chinese) [张思远 2005 复杂晶体化学键的介电理论及其应用 (北京: 科学出版社) 第25页]
[22] Zhang S Y, Xue D F 2000 J. Grad. Sch. Acad. Sin. 17 36 (in Chinese) [张思远, 薛冬峰 2000 中国科学院研究生院学报 17 36]
[23] Gao F M, Gao L H 2011 J. Yanshan Univ. 35 189 (in Chinese) [高发明, 高丽华 2011 燕山大学学报 35 189]
[24] Gao F M 2004 Phys. Rev. B 69 094113
[25] Li S C 2011 Mater. Sci. Forum 689 245
[26] Brown I D, Altermatt D 1985 Acta Crystallogr. B: Struct. Sci. 41 244
[27] Schwartz M 2012 Principles of Electrodynamics (New York: Dover Publications) p45
[28] Irie H, Miyayama M, Kudo T 2001 J. Appl. Phys. 90 4089
[29] Newnham R E, Wolfe R W, Dorrian J F 1971 Mater. Res. Bull. 6 1029
[30] Goto T, Noguchi Y, Soga M, Miyayama M 2005 Mater. Res. Bull. 40 1044
[31] Amorn H, Bdikin I K, Kholkin A L, Costa M E V 2006 Phys. Solid State 48 537
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