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首页> 外文期刊>Journal of Applied Physics >Primary and secondary pyroelectric coefficients of rhombohedral and tetragonal single-domain relaxor-PbTiO_3 single crystals
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Primary and secondary pyroelectric coefficients of rhombohedral and tetragonal single-domain relaxor-PbTiO_3 single crystals

机译：菱形和四方单畴弛豫-PbTiO_3单晶的初级和次级热电系数

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摘要

The primary and secondary pyroelectric coefficients were determined for binary (1-x)Pb(Mg_(1/3)Nb_(2/3)) O_3-xPbTiO_3 (PMN-PT) and ternary Pb(In_(1/2)Nb_(1/2))O_3-Pb(Mg_(1/3)Nb_(2/3))O_3-xPbTiO_3 (PIN-PMN-PT) relaxor-PT single crystals. The secondary pyroelectric coefficients were calculated from the thermodynamic inter-relationship between the piezoelectric, elastic, and thermal expansion coefficients. Poling along [111] and [001] directions resulted in single-domain state of "1R" and "17" and a macroscopic symmetry of 3m and 4mm for rhombohedral (x = 0.28) and tetragonal (x = 0.42) crystals, respectively, enabling relatively large values of pyroelectric coefficients p≥5.7 × 10~(-4) C/m~2 K. The calculated results show that the secondary pyroelectric coefficients are in the range of (-0.62 ~ -1.06) × 10~(-4)C/m~2 K for rhombohedral crystals and (0.70 ~ 1.14) × 10~(-4)C/m~2 K for tetragonal crystals, significantly lower than that of primary pyroelectric coefficients, which is important for thermal directional and imaging applications. In contrast, high d_(15) piezoelectric coefficients (>2000 pC/N), together with zero pyroelectric coefficients in thickness shear crystals, also makes them promising candidates for piezoelectric sensors where thermal noise is undesirable.
机译：确定了二元（1-x）Pb（Mg_（1/3）Nb_（2/3））O_3-xPbTiO_3（PMN-PT）和三元Pb（In_（1/2）Nb_（ 1/2））O_3-Pb（Mg_（1/3）Nb_（2/3））O_3-xPbTiO_3（PIN-PMN-PT）弛豫-PT单晶。根据压电，弹性和热膨胀系数之间的热力学相互关系来计算次级热电系数。沿[111]和[001]方向的极化导致菱形（x = 0.28）和四角形（x = 0.42）晶体的单畴状态分别为“ 1R”和“ 17”，并且宏观对称性分别为3m和4mm，使得热释电系数的值相对较大p≥5.7×10〜（-4）C / m〜2 K.计算结果表明，二次热释电系数在（-0.62〜-1.06）×10〜（- 4）菱面体晶体的C / m〜2 K和四方晶体的（0.70〜1.14）×10〜（-4）C / m〜2 K，显着低于一次热释电系数，这对于热定向和成像应用。相反，高d_（15）压电系数（> 2000 pC / N），以及厚度剪切晶体中的零热电系数，也使它们成为压电传感器的有希望的候选者，其中热噪声是不希望的。

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  • 来源
    《Journal of Applied Physics》 |2013年第8期|084105.1-084105.5|共5页
  • 作者

    Yanxue Tang; Shujun Zhang; Zongyang Shen; Wenhua Jiang; Jun Luo; Raffi Sahul; Thomas R. Shrout;

  • 作者单位

    Key Laboratory of Optoelectronic Material and Device, Shanghai Normal University, Shanghai 200234, People's Republic of China,Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

    TRS Technologies Inc., 2820 E. College Ave., State College, Pennsylvania 16801, USA;

    TRS Technologies Inc., 2820 E. College Ave., State College, Pennsylvania 16801, USA;

    Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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