Crystal growth, structure and thermal properties of noncentrosymmetric single crystals PrCa4O(BO3)3

Yu, Fapeng; Zhang, Shujun; Cheng, Xiufeng; Duan, Xiulan; Ma, Tingfeng; Zhao, Xian

doi:10.1039/c3ce00024a

Cited by 23 publications

(25 citation statements)

References 27 publications

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“…The volume coefficient of thermal expansion, V α , is given by the (invariant) trace of the 4.77 10 × K −1 for LGEB7 and LEB crystals, respectively. Considering the linear thermal expansion of the volume, α V , and taking into account the relations between thermal expansion and covalence and density of weak bonds [31], one can conclude that the degree of covalence in the chemical bonds of the LGEB7 and LEB compounds is lower than in PrCa 4 O(BO 3 ) 3 [32].…”

Section: Rt L L δmentioning

confidence: 99%

Anisotropy of the spectroscopic, optical and thermo-mechanical properties of Li_6Eu_1-xGd_x(BO_3)_3 crystals optimized for heat-scintillation cryogenic bolometers

Belhoucif¹,

Velázquez²,

Petit³

et al. 2014

Opt. Mater. Express

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Optical, spectroscopic and thermo-mechanical properties of monoclinic Li 6 Eu 1-x Gd x (BO 3) 3 (x = 0,0.25,0.35) bulk single crystals, grown to be used in the design of heat-scintillation cryogenic bolometers (HSCBs), were investigated. The linear thermal expansion was determined along the a, b, c and c* directions over the temperature range 303-873 K, and its tensor principal coefficients were calculated for both x = 0.25 and x = 0. In addition, the anisotropic thermal conductivity was measured over the temperature range 20-400 K in Li 6 Eu 0.75 Gd 0.25 (BO 3) 3 (LGEB7, x = 0.25), and the principal components of its tensor at 300 K were established. Spectroscopic properties such as polarized absorption, polarized emission, Raman spectroscopy and optical refractive indices are also reported for the first time. Based on the polarized emission spectra, the line and oscillator strengths, the radiative lifetimes and fluorescent branching ratios were obtained. The intensity parameters Ω λ (λ = 2,4) were obtained and then predicted via the Judd-Ofelt theory. The crystal field parameters and the 7 F 1 level splitting were discussed using the simple overlap model (SOM) and the method of equivalent nearest neighbours (MENN). The 613 nm emission originates from the 5 D 0 → 7 F 2 transition and the associated stimulated emission peak cross section reaches its maximum value in π-polarization, ≈1.07 × 10 −20 cm 2 in LGEB7. The thermomechanical characterizations and spectroscopic analysis in LGEB7 suggest that this crystal has better optical properties than the Eu 3+-doped Li 6 Y(BO 3) 3 crystals. However, its potential for solid-state laser applications is still quite speculative, unless a clever thermo-mechanical management of the crystal under laser operation is designed.

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Section: Rt L L δmentioning

confidence: 99%

Anisotropy of the spectroscopic, optical and thermo-mechanical properties of Li_6Eu_1-xGd_x(BO_3)_3 crystals optimized for heat-scintillation cryogenic bolometers

Belhoucif¹,

Velázquez²,

Petit³

et al. 2014

Opt. Mater. Express

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“…Recently, rare-earth calcium oxyborate crystals ReCa 4 O(BO 3 ) 3 (ReCOB, Re:rare-earth elements) have been reported to be promising for high temperature piezoelectric sensor applications, due to the merits of high electrical resistivity at elevated temperatures (>10 8 Ω·cm@900 o C), high piezoelectric coefficients (~16 pC/N), high electromechanical coupling factors (~31%), and high temperature stability of piezoelectric and electromechanical properties up to 1000 o C [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Growth and piezoelectric properties of TmCOB single crystals

Hou

Wang

et al. 2014

Proceedings of the 2014 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

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New rare-earth oxyborate crystals TmCOB were grown by using the Czochralski method. The piezoelectric coefficients for TmCOB were determined to be on the order of d 11 =1.7, d 12 =3.8, d 13 =-4.2, d 15 =-0.92, d 24 =4.9, d 26 =7.8, d 31 =-0.75, d 32 =-2.4, d 33 =2.2 and d 35 =-5.2 pC/N. The temperature dependence of electro-elastic propertieswereinvestigated from 20 to 900 o C, where the temperature coefficients of the elastic compliances (s E 22 , s E 33 and s E 66 )were foundto be ranged from 146 to223 ppm/ o C for TmCOB crystals. Particularly, the electromechanical factor k 12 was evaluated to be on the order of 15.4% at room temperature, with a small variation <5.4% in the temperature range of 20-900 o C.Moreover, the TmCOB crystals were obtained to possess high piezoelectric coefficientd 26 being 7.8 pC/N, 3-4 times that of quartz, and showing a minimal variation of -12.9% over the test temperature range, potential for high temperature piezoelectric applications.

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“…Among oxyborate crystals, rare-earth calcium oxyborate crystals ReCa 4 O(BO 3 ) 3 (ReCOB, Re: Rare-earth) with monoclinic phase and space group C m were extensively investigated, due to their attractive properties for optical and piezoelectric applications [7][8][9][10][11][12][13][14]. Besides, ReCOB was reported to possess congruent melting point (~1500 o C), thus can be readily grown into large size crystals (3~4 inches diameter) by traditional Czochralski and Bridgeman methods [2,15,16].…”

Section: Introductionmentioning

confidence: 99%

Pyroelectric properties of ReCOB and BiBO oxyborate crystals with monoclinic symmetry

Hou

Zhang

et al. 2013

2013 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications

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Pyroelectric properties of oxyborate crystals with monoclinic structure, including ReCa 4 O(BO 3 ) 3 (ReCOB, Re: rare-earth elements) and BiB 3 O 6 (BiBO), were investigated by charge integration method. The pyroelectric p 1 of ReCOB crystals was found to be negative, being on the order of -59.3~-65.5 C/(m 2 · o C) at 30 o C, while the pyroelectric p 3 was determined to be positive, being around 11.6~31.0 C/(m 2 · o C). The pyroelectric coefficients p 1 and p 3 for ReCOB crystals were observed to decrease with increasing temperature, with variations being on the order of -10.8% to -79.1% over the test temperature range of 20~180 o C. Comparing with ReCOB crystals, larger pyroelectric coefficient (p 2 ) was obtained for BiBO crystals, being on the order of 105.0 C/(m 2 · o C) at room temperature, maintaining the similar value up to 180 o C. Of particular interest is that ReCOB and BiBO crystals were found to possess relative high detectivity F d , two to three times that of commercial TGS and LiTaO 3 .

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Crystal growth, structure and thermal properties of noncentrosymmetric single crystals PrCa4O(BO3)3

Cited by 23 publications

References 27 publications

Anisotropy of the spectroscopic, optical and thermo-mechanical properties of Li_6Eu_1-xGd_x(BO_3)_3 crystals optimized for heat-scintillation cryogenic bolometers

Anisotropy of the spectroscopic, optical and thermo-mechanical properties of Li_6Eu_1-xGd_x(BO_3)_3 crystals optimized for heat-scintillation cryogenic bolometers

Growth and piezoelectric properties of TmCOB single crystals

Pyroelectric properties of ReCOB and BiBO oxyborate crystals with monoclinic symmetry

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