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The powder data for p-chloroiodobenzene and p-bromochlorobenzene/p-chloroiodobenzene mixed crystals [pBCB]x[pCIB]1 - x at 293 K are reported; their stability at 293 K is given. The cell dimensions have been refined by least squares from accurate powder diffractometer data recorded at T = 293 (1) K (quartz as internal standard). Vertical diffractometer, graphite monochromator, Cu K[alpha]1-Cu K[alpha]2 correction so that [lambda] = 1.54056 Å. They are all isomorphous, monoclinic, P21/a with Z = 2. a = 15.818(4), b = 5.912(2), c = 4.214(2) Å, [beta] = 113.61(1)°, V = 361.1 Å3, Dx = 2.193 Mg m-3 for pCIB; JCPDS No. 37-2000. a = 15.210(5), b = 5.860(3), c = 4.091(2) Å, [beta] = 112.64(2)°, V = 336.5 Å3, Dx = 1.936 Mg m-3 for [pBCB]0.90[pCIB]0.10; JCPDS No. 37-1989. a = 15.287(6), b = 5.870(3), c = 4.111(2) Å, [beta] = 112.78(2)°, V = 340.1 Å3, Dx = 1.961 Mg m-3 for [pBCB]0.80[pCIB]0.20; JCPDS No. 37-1990. a = 15.360(5), b = 5.880(2), c = 4.126(1) Å, [beta] = 112.87(2)°, V = 343.3 Å3, Dx = 1.988 Mg m-3 for [pBCB]0.70[pCIB]0.30; JCPDS No. 37-1991. a = 15.424(5), b = 5.889(3), c = 4.137(2) Å, [beta] = 112.99(2)°, V = 346.0 Å3, Dx = 2.018 Mg m-3 for [pBCB]0.60[pCIB]0.40; JCPDS No. 37-1992. a = 15.493(4), b = 5.896(2), c = 4.155(2) Å, [beta] = 113.09(2)°, V= 349.1 Å3, Dx = 2.045 Mg m-3 for [pBCB]0.50[pCIB]0.50; JCPDS No. 37-1993. a = 15.566(5), b = 5.901(3), c = 4.168(2) Å, [beta] = 113.20(2)°, V = 351.9 Å3, Dx = 2.073 Mg m-3 for [pBCB]0.40[pCIB]0.60; JCPDS No. 37-1994. a = 15.623(5), b = 5.904(3), c = 4.178(3) Å, [beta] = 113.26(2), V = 354.0 Å3, Dx = 2.105 Mg m-3 for [pBCB]0.30[pCIB]0.70; JCPDS No. 37-1995. a = 15.691(4), b = 5.913(3), c = 4.195(2)Å, [beta] = 113.43(2)°, V = 357.1 Å3, Dx = 2.130 Mg m-3 for [pBCB]0.20[pCIB]0.80; JCPDS No. 37-1996. a = 15.759(4), b = 5.906(2), c = 4.204(2) Å, [beta] = 113.55(2)°, V = 358.7 Å3, Dx = 2.164 Mg m-3 for [pBCB]0.10[pCIB]0.90; JCPDS No. 37-1999.

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The variations of the tensor of compositional deformation as a function of composition are determined for the ten series of mixed crystals corresponding to the ten binary systems formed by p-dichlorobenzene, p-bromochlorobenzene, p-dibromobenzene, p-chloroiodobenzene and p-bromoiodobenzene.

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The powder data for p-bromochlorobenzene/p-dibromobenzene mixed crystals [pBCB]x[pDBB]1 - x at 293 K are reported; their thermal stability at 293 K is given. Vertical diffractometer, graphite monochromator, Cu K[alpha], [lambda] = 1.54056 Å. They are all isomorphous, monoclinic, P21/a with Z = 2. a = 15.176(6), b = 5.847(3), c = 4.078(2) Å, [beta] = 112.57(3)°, V = 334.2 Å3, Dx = 1.947 Mg m-3 for [pBCB]0.90[pDBB]0.10; JCPDS No. 36-1975. a = 15.222 (7), b = 5.847 (3), c = 4.083(2) Å, [beta] = 112.60(3)°, V = 335.5 Å3, Dx = 1.984 Mg m-3 for [pBCB]0.80[pDBB]0.20; JCPDS No. 36-1974. a = 15.260(5), b = 5.839(2), c = 4.084(2) Å, [beta] = 112.57(1)°, V = 336.1 Å3, Dx = 2.024 Mg m-3 for [pBCB]0.70[pDBB]0.30; JCPDS No. 36-1973. a = 15.298(4), b = 5.845(3), c = 4.091(2) Å, [beta] = 112.60(2), V = 337.7 Å3, Dx = 2.058 Mg m-3 for [pBCB]0.60[pDBB]0.40; JCPDS No. 36-1972. a = 15.340(4), b = 5.844(2), c = 4.092(2) Å, [beta] = 112.60(2)°, V = 338.7 Å3, Dx = 2.096 Mg m-3 for [pBCB]0.50[pDBB]0.50; JCPDS No. 36-1971. a = 15.370(5), b = 5.843(2), c = 4.097(2) Å, [beta] = 112.62(2)°, V = 339.6 Å3, Dx = 2.134 Mg  m-3 for [pBCB]0.40[pDBB]0.60; JCPDS No. 36-1970. a = 15.404(6), b = 5.840(2), c = 4.100(2) Å, [beta] = 112.67(2)°, V = 340.4 Å3, Dx = 2.172 Mg m-3 for [pBCB]0.30[pDBB]0.70; JCPDS No. 36-1969. a = 15.437(5), b = 5.842(2), c = 4.103(2) Å, [beta] = 112.66(2)°, V = 341.4 Å3, Dx = 2.209 Mg m-3 for [pBCB]0.20[pDBB]0.80; JCPDS No. 36-1968. a = 15.468(4), b = 5.838(2), c = 4.104(2) Å, [beta] = 112.70(2)°, V = 341.9 Å3, Dx = 2.249 Mg m-3 for [pBCB]0.10[pDBB]0.90; JCPDS No. 36-1967.

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The [alpha]-phase structure of the title compound, C6H4Cl2, has been accurately redetermined at room temperature. Comparison with 100 K data shows that all different shortest intermolecular contacts (Cl...Cl, Cl...C, Cl...H, C...C, C...H, H...H) undergo thermal expansion. A three-centred hydrogen-bonding geometry is considered for some Cl...H contacts.

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Heterojunctions GaAs-AlxGa1-xAs involved in the elaboration of IR laser diodes have been studied. The difference in lattice parameter between the GaAs substrate and the aluminum-substituted epitaxic layer AlxGa1-xAs has been measured accurately on a double-crystal spectrometer for a series of compositions. These data coupled with radius of curvature determination have permitted calculation of the stress in the layer and the bulk lattice parameter of AlxGa1-xAs. characterization of the defects introduced during the liquid-phase epitaxy has been performed by X-ray topography.

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The powder data for p-bromochlorobenzene(pBCB) and p-dichlorobenzene/p-bromochlorobenzene mixed crystals [pDCB]x[pBCB]1 - x at 293 K are reported; their thermal stability at 293 K is given. Vertical diffractomer, graphite monochromator, Cu K[alpha], [lambda] = 1.5405 Å. They are all isomorphous, monoclinic, P21/a with Z = 2. a = 15.134(4), b = 5.843(2), c = 4.073(1) Å, [beta] = 112.53(1)°, V = 332.7 Å3, Dx = 1.911 Mg m-3 for pBCB. a = 14.890(5), b = 5.848(5), c = 4.046(2) Å, [beta] = 112.53(2)°, V = 325.4 Å3, Dx = 1.636 Mg m-3 for [pDCB]0.70[pBCB]0.30. a = 15.004(6), b = 5.840(3), c = 4.059(2) Å, [beta] = 112.48(2)°, V = 328.6 Å3, Dx = 1.755 Mg m-3 for [pDCB]0.40[pBCB]0.60. a = 15.101(4), b = 5.844(2), c = 4.066(2) Å, [beta] = 112.51(2)°, V = 331.5 Å3, Dx = 1.873 Mg m-3 for [pDCB]0. 10[pBCB]0.90. The JCPDS Nos. are: 36-1995 for pBCB; 36-1994 for [pDCB]0.70[PBCB]0.30; 36-1993 for [pDCB]0.40[pBCB]0.60; 36-1992 for [pDCB]0.10[pBCB]0.90. Data for [pDCB]0.90[pBCB]0.10, [pDCB]0.80 [pBCB]0.20, [pDCB]0.60 [pBCB]0.40, [pDCB]0.50[pBCB]0.50, [pDCB]0.30[pBCB]0.70 and [pDCB]0.20[pBCB]0.80 have also been measured and are available from the authors or as part of the Supplementary Publication.

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The data given in the Abstract published in J. AppI. Cryst. (1985), 18, 542 are in error. The correct data are given below:

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