Large-sized and high-quality Er: Bi2ZnB2O7 (Er: BZBO) single crystal has been grown using the Kyropoulos method. The crystal structure is refined by the Rietveld method, Er: BZBO belongs to the orthorhombic system and space group Pba2, lattice parameters: a = 10.811(1) Å, b = 11.006(1) Å, c = 4.8817(4) Å, which are slightly reduced after doping with Er3+. The thermal expansion anisotropy is studied and shows a decrease with coefficients of α11 = 7.69(1) × 10−6 K−1, α22 = 9.90(9) × 10−6 K−1, and α33 = 1.98(8) × 10−6 K−1, respectively. The relative dielectric constants are found to be εT11/ε0 = 32.8(1), εT22/ε0 = 17.2(1), and εT33/ε0 = 17.0(9), respectively. The dielectric, elastic, and piezoelectric constants for the Er: BZBO crystal are determined by the impedance method, with the piezoelectric coefficients d15, d24, d31, d32 and d33 are measured as 1.1(9), −5.4(2), 1.8(7), −5.9(1) and 1.1(5) pC/N, respectively. Furthermore, the temperature dependence of the piezoelectric coefficients from room temperature to 500 °C is evaluated, showing good temperature stability for d24 and d32 with variations were −7 % and 13 %, respectively.

中文翻译：

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Er3+ 掺杂 BZBO 单晶：生长和电弹性特性表征


采用泡生法生长出大尺寸、高质量的 Er: Bi2ZnB2O7 (Er: BZBO) 单晶。采用Rietveld法精修晶体结构，Er：BZBO属于斜方晶系，空间群Pba2，晶格参数：a = 10.811(1) Å，b = 11.006(1) Å，c = 4.8817(4) Å，掺杂Er3+后略有降低。研究了热膨胀各向异性，结果显示随着系数 α11 = 7.69(1) × 10−6 K−1、α22 = 9.90(9) × 10−6 K−1 和 α33 = 1.98(8) × 10 的减小分别为−6 K−1。相对介电常数分别为εT11/ε0 = 32.8(1)、εT22/ε0 = 17.2(1) 和εT33/ε0 = 17.0(9)。采用阻抗法测定了Er:BZBO晶体的介电​​常数、弹性常数和压电常数，测得压电系数d15、d24、d31、d32和d33分别为1.1(9)、-5.4(2)、1.8( 7)、-5.9(1) 和 1.1(5) pC/N。此外，还评估了从室温到500°C的压电系数的温度依赖性，显示d24和d32具有良好的温度稳定性，变化分别为-7%和13%。