The elastic constants of YBa2Cu3O7−δ

Ramakrishnan, Chellam; Krishnamurthy, N.

doi:10.1016/0038-1098(91)90562-a

Cited by 15 publications

(8 citation statements)

References 33 publications

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“…The ultrasonic wave velocities in this dense, comparatively small gained YBa2Cu3OT,x ceramic sample at room temperature fall within the range of values measured on both coarse-grained and fine-grained ceramic materials [1,2] and a very large-grained halide flux-grown specimen [3] (table 2). A theoretical calculation [25] of the elastic stiffness moduli predicts similar sound wave velocities for polycrystalline YBa2Cu3OT., (table 2). For single-crystal YBa2Cu3OT., a comparable value for an average longitudinal wave velocity of 4460ms _ was obtained [3] from published data [26]; the single-crystal ultrasonic wave velocity measurements of Saint-Paul et al [27] are in accord with this.…”

Section: Ultrasonic Wave Velocities and Elastic Stiffnessesmentioning

confidence: 88%

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Ultrasonic determination of the elastic moduli and their pressure dependences in very dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}

Cankurtaran¹,

Saunders²,

Goretta³

et al. 1991

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I Thesubmitted manuscrll:_ hu beenauthored by , _, e contractorof the US, Gov.tnment und., 0 _ T I contracl No.W.31-109-ENG.38Accordingly, the U,S.Government retainsa nonexcluslve, royalty. freeUcense to publishor reproduce thepublished formofthiscontribution, orallowothersto doto, forUS. Government purposes. DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employc_s, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclose, or represents that its use would not infringe privately owned rights. Refer-en_ herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not n_._ssadly constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

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Section: Ultrasonic Wave Velocities and Elastic Stiffnessesmentioning

confidence: 88%

“…These data are not corrected for porosity. Results obtained from a theoretical study [25] are also included.…”

Section: The Bulk Modulus Of Yba2cu3ot X and Its Hydrostatic Pressurmentioning

confidence: 99%

Ultrasonic determination of the elastic moduli and their pressure dependences in very dense YBa{sub 2}Cu{sub 3}O{sub 7{minus}x}

Cankurtaran¹,

Saunders²,

Goretta³

et al. 1991

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“…The nine constants determined by Reichardt et al [10] using a neutron scattering technique are denoted set 1 it is at present, to the best of our knowledge, the only complete set of measured constants. Set 2 was computed by Ramakrishnan and Krishnamurthy [11] according to an unscreened rigid ion model and set 3 was estimated by Ledbetter and Ming Lei [12]. The latter two sets were chosen because of their good agreement with various reported experimental data (for a summary see [12]).…”

Section: Polycrystalline Void-free Elastic Moduli: Evaluation From Si...mentioning

confidence: 99%

Porosity behaviour of ultrasonic velocities in polycrystalline Y - B - C - O

Masi¹,

Borchi²,

Gennaro³

1996

J. Phys. D: Appl. Phys.

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Longitudinal and shear velocities are measured for five polycrystalline Y - B - C - O samples presenting different porosities. The experimental data are compared with the velocity versus porosity curves calculated according to three different methods and a discussion is presented on the reliability of these methods in estimating the porosity effects, both at low and at high void concentrations. For the calculation several sets of the nine elastic constants of Y - B - C - O monocrystals are used. A remarkable good agreement between our data and those obtained from the single-crystal constants is observed, when the method of Sayers and Smith is used to take porosity into account.

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“…Only three diagonal constants have been measured by the Brillouin scattering technique (41. However the complete set of constants has been theoretically estimated [27]. Reliable experimental data [4,6,7] and theoretical estimates [27,28] are reported in table 2.…”

mentioning

confidence: 99%

“…However the complete set of constants has been theoretically estimated [27]. Reliable experimental data [4,6,7] and theoretical estimates [27,28] are reported in table 2. Considering that some discrepancies are also present among different experimental sets, the theoretical values in column 4 agree fairly well with the experimental ones; it must be noted, however, that due to the microtwinning in the experimental data, c,, = c22 and cM = css.…”

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confidence: 99%