Characterization of Neodymium Calcium Oxyborate Piezoelectric Crystal with Monoclinic Phase

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• 作者：Fapeng Yu ; Shujun Zhang ; Xian Zhao ; Duorong Yuan ; Chun-Ming Wang ; Thomas R. Shrout
• 刊名：Crystal Growth & Design
• 出版年：2010
• 出版时间：April 7, 2010
• 年：2010
• 卷：10
• 期：4
• 页码：1871-1877
• 全文大小：818K
• 年卷期：v.10,no.4(April 7, 2010)
• ISSN：1528-7505

文摘

Piezoelectric crystals of neodymium calcium oxyborate, NdCa₄O(BO₃)₃ (NdCOB), were grown by the Czochralski technique. The density was measured using the Archimedes method and found to be 3.63 g/cm³, in good agreement with the theoretical value. The thermal properties of NdCOB have been investigated, with the specific heat being on the order of 0.550 J/(g °C). The four thermal expansion coefficients were measured and found to be α₁₁ = 8.12, α₁₃ = 0.680, α₂₂ = 5.96, and α₃₃ = 10.3 (10⁻⁶/°C), respectively. The relative dielectric permittivities were determined to be ε₁₁^T/ε₀ = 9.90, ε₂₂^T/ε₀ = 15.5, ε₃₃^T/ε₀ = 10.2, and ε₁₃^T/ε₀ = −1.60, respectively, with corresponding low dielectric loss at 100 kHz, being on the order of <0.1%. The complete set of dielectric, elastic, and piezoelectric constants for NdCOB single crystals were determined by the resonance method and compared to other oxyborate crystals ReCa₄O(BO₃)₃ (Re = rare earth), where NdCOB exhibited relatively higher piezoelectric properties with d₁₃ = −4.8 pC/N, k₁₃ = 16.8%, d₂₆ = 16.5 pC/N, and k₂₆ = 31.1%, respectively. The relationship between piezoelectric property and structure was explored, in order to further improve the properties of ReCOB crystals.