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A single crystal of Nd5Mo3O16 with lead partly substituting for neodymium, which has a fluorite-like structure, was studied by precision X-ray diffraction, high-resolution transmission microscopy and EDX microanalysis. The crystal structure is determined in the space group Pn\bar 3n. It was found that the Pb atoms substitute in part for Nd atoms in the structure and are located in the vicinity of Nd2 positions. Partial substitutions of Mo cations for Nd positions and of Nd for Mo positions in crystals of the Ln5Mo3O16 oxide family are corroborated by X-ray diffraction for the first time. The first experimental verification of the location of an additional oxygen ion in the voids abutting MoO4 tetrahedra was obtained.

Supporting information

cif

Crystallographic Information File (CIF) https://doi.org/10.1107/S2052520615003315/bp5077sup1.cif
Contains datablocks global, I

hkl

Structure factor file (CIF format) https://doi.org/10.1107/S2052520615003315/bp5077Isup2.hkl
Contains datablock I

CCDC reference: 1050401

Computing details top

Figures top
[Figure 1]
[Figure 2]
[Figure 3]
[Figure 4]
[Figure 5]
[Figure 6]
[Figure 7]
[Figure 8]
[Figure 9]
[Figure 10]
[Figure 11]
(I) top
Crystal data top
Mo2.603Nd4.365O16.47Pb0.335F(000) = 2122
Mr = 1212.3Dx = 5.979 Mg m3
Cubic, Pn3nMo Kα radiation, λ = 0.71073 Å
Hall symbol: -P 4a;2bc;3µ = 23.12 mm1
a = 11.0421 (11) ÅT = 293 K
V = 1346.3 (2) Å3Sphere, light violet
Z = 40.30 × 0.30 × 0.30 × 0.15 (radius) mm
Data collection top
Oxford Diffraction CCD
diffractometer
1174 independent reflections
Radiation source: X-ray tube771 reflections with I > 3σ(I)
Graphite monochromatorRint = 0.032
ω scansθmax = 49.7°, θmin = 4.5°
Absorption correction: for a sphere
Jana2006 (Petricek, Dusek & Palatinus, 2000)
h = 2223
Tmin = 0.895, Tmax = 1.000k = 2323
111689 measured reflectionsl = 2323
Refinement top
Refinement on F0 constraints
R[F2 > 2σ(F2)] = 0.020Weighting scheme based on measured s.u.'s w = 1/(σ2(F) + 0.0016F2)
wR(F2) = 0.057(Δ/σ)max = 0.032
S = 1.06Δρmax = 0.80 e Å3
1174 reflectionsΔρmin = 0.79 e Å3
48 parametersExtinction correction: B-C type 2 (Becker & Coppens, 1974)
0 restraintsExtinction coefficient: 3200 (300)
Crystal data top
Mo2.603Nd4.365O16.47Pb0.335Z = 4
Mr = 1212.3Mo Kα radiation
Cubic, Pn3nµ = 23.12 mm1
a = 11.0421 (11) ÅT = 293 K
V = 1346.3 (2) Å30.30 × 0.30 × 0.30 × 0.15 (radius) mm
Data collection top
Oxford Diffraction CCD
diffractometer
1174 independent reflections
Absorption correction: for a sphere
Jana2006 (Petricek, Dusek & Palatinus, 2000)
771 reflections with I > 3σ(I)
Tmin = 0.895, Tmax = 1.000Rint = 0.032
111689 measured reflections
Refinement top
R[F2 > 2σ(F2)] = 0.02048 parameters
wR(F2) = 0.0570 restraints
S = 1.06Δρmax = 0.80 e Å3
1174 reflectionsΔρmin = 0.79 e Å3
Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/UeqOcc. (<1)
Nd10.24051 (3)000.00954 (6)0.8887
Nd20.250.250.250.01022 (10)0.6722
Pb0.262 (2)0.246 (4)0.2422570.019 (2)*0.0279
Mo10.2500.50.0078 (4)0.4546
O10.12963 (15)0.12963 (15)0.12963 (15)0.0141 (3)
O20.33486 (16)0.42350 (18)0.11374 (15)0.0205 (4)0.8763
Mo20.2625790.2715910.2051170.031 (10)*0.0075
Mo30.288 (2)0.218 (3)0.243 (4)0.040 (5)*0.0188
Nd30.2279 (8)0.0150 (9)0.5157 (10)0.0073 (14)*0.0212
Mo1_10.2653 (7)0.000 (3)0.503 (3)0.0071 (12)*0.077
Nd1_10.219619000.13 (3)*0.0333
O2_10.3678 (19)0.3781 (14)0.1222 (14)0.013 (6)*0.085 (13)
O2_20.301 (3)0.451 (3)0.151 (3)0.032 (5)*0.0633
O30.50.500.08 (3)*0.12
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
Nd10.00878 (11)0.00993 (10)0.00993 (10)000
Nd20.01022 (18)0.01022 (18)0.01022 (18)0.0013 (2)0.0013 (2)0.0013 (2)
Mo10.0023 (9)0.0105 (6)0.0105 (6)000
O10.0141 (5)0.0141 (5)0.0141 (5)0.0005 (3)0.0005 (3)0.0005 (3)
O20.0216 (6)0.0210 (7)0.0189 (6)0.0030 (6)0.0042 (5)0.0002 (5)
Bond lengths (Å) top
Nd1—O12.366 (2)O2—Nd3xxxiii1.741 (10)
Nd1—O1i2.366 (2)O2—Nd3x1.730 (11)
Nd1—O1ii2.366 (2)O2—Nd3xxxiv1.633 (10)
Nd1—O1iii2.366 (2)O2—Nd3xxxv2.590 (10)
Nd1—O2iv2.575 (2)O2—Nd3xxxvi2.967 (10)
Nd1—O2v2.575 (2)O2—Mo1_1viii2.84 (3)
Nd1—O2vi2.575 (2)O2—Mo1_1xxxi2.80 (3)
Nd1—O2vii2.575 (2)O2—Mo1_1xxxii1.71 (3)
Nd1—Nd1_10.2308 (3)O2—Mo1_1xxxiii1.68 (3)
Nd1—O2_1iv2.499 (16)O2—Mo1_1x1.90 (3)
Nd1—O2_1v2.499 (16)O2—Mo1_1xxxiv1.85 (3)
Nd1—O2_1vi2.499 (16)O2—Mo1_1xxxv3.03 (2)
Nd1—O2_1vii2.499 (16)O2—Mo1_1xxxvi3.05 (2)
Nd1—O2_2iv2.56 (3)O2—Nd1_1xi2.725 (2)
Nd1—O2_2v2.56 (3)O2—O2_10.628 (16)
Nd1—O2_2vi2.56 (3)O2—O2_1xxviii3.422 (11)
Nd1—O2_2vii2.56 (3)O2—O2_1ii2.716 (12)
Nd1—O3iv2.8652 (7)O2—O2_1xxix2.35 (2)
Nd2—Pb0.16 (2)O2—O2_1xii3.230 (12)
Nd2—Pbviii0.16 (2)O2—O2_1iv3.26 (2)
Nd2—Pbix0.16 (2)O2—O2_1xi2.412 (11)
Nd2—Pbx0.16 (2)O2—O2_1xiii3.471 (17)
Nd2—Pbiv0.16 (2)O2—O2_1xxx3.136 (18)
Nd2—Pbxi0.16 (2)O2—O2_20.63 (3)
Nd2—O12.303 (2)O2—O2_2xxviii3.26 (3)
Nd2—O1x2.303 (2)O2—O2_2ii3.47 (3)
Nd2—O22.610 (2)O2—O2_2xxix3.33 (3)
Nd2—O2viii2.610 (2)O2—O2_2xii2.75 (3)
Nd2—O2ix2.610 (2)O2—O2_2xxxvii3.21 (3)
Nd2—O2x2.610 (2)O2—O2_2iv2.58 (3)
Nd2—O2iv2.610 (2)O2—O2_2xi3.40 (3)
Nd2—O2xi2.610 (2)O2—O2_2xiii2.48 (3)
Nd2—Mo20.5672 (1)O2—O2_2xxx3.01 (3)
Nd2—Mo2viii0.5672 (1)O2—O32.369 (2)
Nd2—Mo2ix0.5672 (1)Mo2—Mo2viii0.9753 (1)
Nd2—Mo2x0.5672 (1)Mo2—Mo2ix0.9753 (1)
Nd2—Mo2iv0.5672 (1)Mo2—Mo2x1.1345 (2)
Nd2—Mo2xi0.5672 (1)Mo2—Mo2iv0.5794 (1)
Nd2—Mo30.55 (3)Mo2—Mo2xi0.5794 (1)
Nd2—Mo3viii0.55 (3)Mo2—Mo30.78 (4)
Nd2—Mo3ix0.55 (3)Mo2—Mo3viii0.32 (4)
Nd2—Mo3x0.55 (3)Mo2—Mo3ix1.09 (3)
Nd2—Mo3iv0.55 (3)Mo2—Mo3x0.81 (4)
Nd2—Mo3xi0.55 (3)Mo2—Mo3iv1.08 (3)
Nd2—O2_12.386 (15)Mo2—Mo3xi0.28 (4)
Nd2—O2_1viii2.386 (15)Mo2—Nd3xxxi3.481 (10)
Nd2—O2_1ix2.386 (15)Mo2—Nd3xxxiii3.171 (11)
Nd2—O2_1x2.386 (15)Mo2—Nd3x3.395 (11)
Nd2—O2_1iv2.386 (15)Mo2—Nd3xxxiv3.405 (10)
Nd2—O2_1xi2.386 (15)Mo2—Nd3xxxv3.224 (10)
Nd2—O2_22.54 (3)Mo2—Mo1_1viii3.49 (3)
Nd2—O2_2viii2.54 (3)Mo2—Mo1_1xxxi3.44 (3)
Nd2—O2_2ix2.54 (3)Mo2—Mo1_1xxxii3.41 (3)
Nd2—O2_2x2.54 (3)Mo2—Mo1_1xxxiii3.37 (3)
Nd2—O2_2iv2.54 (3)Mo2—Mo1_1x3.43 (3)
Nd2—O2_2xi2.54 (3)Mo2—Mo1_1xxxiv3.38 (3)
Pb—Pbviii0.28 (4)Mo2—Mo1_1xxxv3.47 (3)
Pb—Pbix0.28 (4)Mo2—O2_11.892 (16)
Pb—Pbx0.33 (3)Mo2—O2_1viii2.681 (13)
Pb—Pbiv0.16 (4)Mo2—O2_1ix2.755 (17)
Pb—Pbxi0.16 (4)Mo2—O2_1x2.907 (15)
Pb—O12.31 (3)Mo2—O2_1iv2.201 (17)
Pb—O1x2.31 (3)Mo2—O2_1xi2.108 (13)
Pb—O22.55 (3)Mo2—O12.304 (2)
Pb—O2viii2.77 (2)Mo2—O2_22.11 (3)
Pb—O2ix2.52 (3)Mo2—O2_2viii3.00 (3)
Pb—O2x2.68 (3)Mo2—O2_2ix2.69 (3)
Pb—O2iv2.46 (2)Mo2—O2_2xii3.23 (3)
Pb—O2xi2.71 (3)Mo2—O2_2xxxvii3.47 (3)
Pb—Mo20.50 (3)Mo2—O2_2x3.01 (3)
Pb—Mo2viii0.73 (2)Mo2—O2_2iv2.13 (3)
Pb—Mo2ix0.52 (4)Mo2—O2_2xi2.51 (3)
Pb—Mo2x0.670 (16)Mo2—O2_2xiii3.02 (3)
Pb—Mo2iv0.41 (2)Mo3—Mo3viii0.96 (4)
Pb—Mo2xi0.66 (4)Mo3—Mo3ix0.96 (4)
Pb—Mo30.42 (5)Mo3—Mo3x1.11 (4)
Pb—Mo3viii0.58 (5)Mo3—Mo3iv0.55 (5)
Pb—Mo3ix0.70 (3)Mo3—Mo3xi0.55 (5)
Pb—Mo3x0.70 (4)Mo3—Nd3xxxviii3.12 (3)
Pb—Mo3iv0.58 (4)Mo3—Nd3xi3.39 (3)
Pb—Mo3xi0.42 (3)Mo3—Nd3xxxix3.37 (3)
Pb—O2_12.29 (3)Mo3—Nd3xxxv3.37 (4)
Pb—O2_1viii2.54 (3)Mo3—Nd3xxv3.49 (4)
Pb—O2_1ix2.33 (3)Mo3—Mo1_1xxi3.39 (4)
Pb—O2_1x2.49 (3)Mo3—Mo1_1xxxviii3.34 (4)
Pb—O2_1iv2.23 (3)Mo3—Mo1_1xi3.38 (4)
Pb—O2_1xi2.45 (3)Mo3—Mo1_1xxxix3.34 (4)
Pb—O2_22.51 (5)Mo3—O2_12.38 (4)
Pb—O2_2viii2.68 (4)Mo3—O2_1viii2.89 (4)
Pb—O2_2ix2.42 (4)Mo3—O2_1ix2.00 (4)
Pb—O2_2xii3.38 (4)Mo3—O2_1x2.51 (4)
Pb—O2_2x2.57 (5)Mo3—O2_1iv1.92 (4)
Pb—O2_2iv2.40 (4)Mo3—O2_1xi2.83 (3)
Pb—O2_2xi2.66 (4)Mo3—O12.36 (3)
Pb—O2_2xiii3.48 (4)Mo3—O2_22.77 (5)
Pb—O2_2vii3.43 (5)Mo3—O2_2viii2.90 (5)
Mo1—O2ix2.927 (2)Mo3—O2_2ix2.05 (4)
Mo1—O2xiv2.927 (2)Mo3—O2_2xii3.19 (4)
Mo1—O2xv1.780 (2)Mo3—O2_2xv3.46 (5)
Mo1—O2xvi1.780 (2)Mo3—O2_2x2.41 (5)
Mo1—O2x1.780 (2)Mo3—O2_2iv2.26 (5)
Mo1—O2xvii1.780 (2)Mo3—O2_2xi3.05 (4)
Mo1—O2xviii2.927 (2)Mo3—O2_2vii3.06 (5)
Mo1—O2xix2.927 (2)Nd3—Nd3xxiii0.484 (15)
Mo1—Mo2ix3.4727 (5)Nd3—Nd3xl3.343 (13)
Mo1—Mo2xiv3.4727 (5)Nd3—Nd3xxiv0.596 (13)
Mo1—Mo2xv3.3927 (5)Nd3—Nd3xxv0.596 (13)
Mo1—Mo2xvi3.3927 (5)Nd3—Mo1_10.468 (19)
Mo1—Mo2x3.3927 (5)Nd3—Mo1_1xxiii0.49 (2)
Mo1—Mo2xvii3.3927 (5)Nd3—Mo1_1xli3.48 (3)
Mo1—Mo2xviii3.4727 (5)Nd3—Mo1_1xxiv0.28 (3)
Mo1—Mo2xix3.4727 (5)Nd3—Mo1_1xxv0.23 (3)
Mo1—Mo3xx3.36 (3)Nd3—O2_1ix2.610 (19)
Mo1—Mo3xxi3.36 (3)Nd3—O2_1xiv2.584 (18)
Mo1—Mo3iv3.36 (3)Nd3—O2_1xv2.27 (2)
Mo1—Mo3xxii3.36 (3)Nd3—O2_1xvi2.646 (19)
Mo1—Nd30.344 (10)Nd3—O2_1x2.200 (18)
Mo1—Nd3xxiii0.344 (10)Nd3—O2_1xvii2.186 (18)
Mo1—Nd3xxiv0.344 (10)Nd3—O2_1xviii2.099 (19)
Mo1—Nd3xxv0.344 (10)Nd3—O2_1xix2.515 (19)
Mo1—Mo1_10.172 (10)Nd3—O2_2viii3.35 (3)
Mo1—Mo1_1xxiii0.172 (10)Nd3—O2_2xv1.74 (3)
Mo1—Mo1_1xxiv0.172 (10)Nd3—O2_2xvi2.13 (3)
Mo1—Mo1_1xxv0.172 (10)Nd3—O2_2x1.91 (3)
Mo1—O2_1ix2.437 (16)Nd3—O2_2xvii1.68 (3)
Mo1—O2_1xiv2.437 (16)Nd3—O2_2xviii3.20 (3)
Mo1—O2_1xv2.308 (15)Nd3—O2_2xlii3.44 (3)
Mo1—O2_1xvi2.308 (15)Nd3—O3ix3.014 (9)
Mo1—O2_1x2.308 (15)Nd3—O3x2.528 (9)
Mo1—O2_1xvii2.308 (15)Mo1_1—Mo1_1xxiii0.07 (5)
Mo1—O2_1xviii2.437 (16)Mo1_1—Mo1_1xxiv0.341 (13)
Mo1—O2_1xix2.437 (16)Mo1_1—Mo1_1xxv0.341 (13)
Mo1—O2_2xv1.84 (3)Mo1_1—O2_1ix2.36 (3)
Mo1—O2_2xvi1.84 (3)Mo1_1—O2_1xiv2.32 (3)
Mo1—O2_2x1.84 (3)Mo1_1—O2_1xv2.20 (3)
Mo1—O2_2xvii1.84 (3)Mo1_1—O2_1xvi2.24 (3)
Mo1—O3ix2.7605 (6)Mo1_1—O2_1x2.43 (3)
Mo1—O3x2.7605 (6)Mo1_1—O2_1xvii2.39 (3)
O1—O1ii2.862 (3)Mo1_1—O2_1xviii2.52 (3)
O1—O1iii2.862 (3)Mo1_1—O2_1xix2.56 (3)
O1—O1xxvi2.862 (3)Mo1_1—O2_2ix3.46 (4)
O1—O2x2.921 (3)Mo1_1—O2_2xiv3.42 (4)
O1—O2iv2.921 (3)Mo1_1—O2_2xv1.79 (5)
O1—O2xi2.921 (3)Mo1_1—O2_2xvi1.81 (5)
O1—Mo22.304 (2)Mo1_1—O2_2x1.93 (5)
O1—Mo2viii2.304 (2)Mo1_1—O2_2xvii1.87 (5)
O1—Mo2ix2.304 (2)Mo1_1—O2_2xlii3.46 (5)
O1—Mo2x2.437 (2)Mo1_1—O3ix2.592 (8)
O1—Mo2iv2.437 (2)Mo1_1—O3x2.930 (8)
O1—Mo2xi2.437 (2)Nd1_1—Nd1_1viii3.4295 (5)
O1—Mo32.36 (3)Nd1_1—Nd1_1xliii3.4295 (5)
O1—Mo3viii2.36 (3)Nd1_1—Nd1_1ix3.4295 (5)
O1—Mo3ix2.36 (3)Nd1_1—Nd1_1xliv3.4295 (5)
O1—Mo3x2.37 (4)Nd1_1—O2_1iv2.645 (15)
O1—Mo3iv2.37 (4)Nd1_1—O12.255 (2)
O1—Mo3xi2.37 (4)Nd1_1—O1i2.255 (2)
O1—Nd1_12.255 (2)Nd1_1—O1ii2.255 (2)
O1—Nd1_1viii2.255 (2)Nd1_1—O1iii2.255 (2)
O1—Nd1_1ix2.255 (2)Nd1_1—O2iv2.725 (2)
O1—O2_1x2.744 (11)Nd1_1—O2v2.725 (2)
O1—O2_1iv2.744 (11)Nd1_1—O2vi2.725 (2)
O1—O2_1xi2.744 (11)Nd1_1—O2vii2.725 (2)
O1—O2_2x2.69 (3)Nd1_1—O2_1v2.645 (15)
O1—O2_2iv2.69 (3)Nd1_1—O2_1vi2.645 (15)
O1—O2_2xi2.69 (3)Nd1_1—O2_1vii2.645 (15)
O1—O2_2xxvii3.22 (3)Nd1_1—O2_2iv2.68 (3)
O1—O2_2xiii3.22 (3)Nd1_1—O2_2v2.68 (3)
O1—O2_2vii3.22 (3)Nd1_1—O2_2vi2.68 (3)
O2—O2xxviii3.026 (3)Nd1_1—O2_2vii2.68 (3)
O2—O2ii2.867 (3)Nd1_1—O3iv3.0960 (6)
O2—O2xxix2.842 (3)O2_1—O2_1ii2.699 (16)
O2—O2xii2.842 (3)O2_1—O2_1xxix2.81 (2)
O2—O2iv2.938 (3)O2_1—O2_1xii2.81 (2)
O2—O2xi2.938 (3)O2_1—O2_1iv2.72 (2)
O2—O2xiii2.845 (3)O2_1—O2_1xi2.72 (2)
O2—O2xxx2.845 (3)O2_1—O2_21.14 (4)
O2—Mo22.114 (2)O2_1—O2_2ix3.32 (4)
O2—Mo2viii2.872 (2)O2_1—O2_2ii3.26 (4)
O2—Mo2ix3.001 (2)O2_1—O2_2xii2.20 (4)
O2—Mo2x3.131 (2)O2_1—O2_2iv2.14 (3)
O2—Mo2iv2.454 (2)O2_1—O2_2xiii2.67 (4)
O2—Mo2xi2.295 (2)O2_1—O32.399 (16)
O2—Mo32.73 (4)O2_2—O2_2xxix3.20 (5)
O2—Mo3viii2.14 (3)O2_2—O2_2xii3.20 (5)
O2—Mo3ix3.06 (3)O2_2—O2_2xxxvii2.58 (5)
O2—Mo3x2.61 (4)O2_2—O2_2iv3.05 (5)
O2—Mo3iv3.11 (3)O2_2—O2_2xi3.05 (5)
O2—Mo3xi2.21 (4)O2_2—O2_2xiii2.72 (5)
O2—Nd3viii3.139 (10)O2_2—O2_2xxx2.72 (5)
O2—Nd3xxxi3.065 (10)O2_2—O32.81 (3)
O2—Nd3xxxii2.112 (10)
Symmetry codes: (i) x, y, z; (ii) y, x, z; (iii) y, x, z; (iv) z+1/2, x+1/2, y+1/2; (v) z+1/2, x1/2, y1/2; (vi) z+1/2, y+1/2, x1/2; (vii) z+1/2, y1/2, x+1/2; (viii) z, x, y; (ix) y, z, x; (x) x+1/2, y+1/2, z+1/2; (xi) y+1/2, z+1/2, x+1/2; (xii) y+1, x, z; (xiii) x+1/2, z+1/2, y1/2; (xiv) y, z, x+1; (xv) x, z, y+1; (xvi) x, z, y; (xvii) x+1/2, y1/2, z+1/2; (xviii) y+1/2, x+1/2, z+1/2; (xix) y+1/2, x1/2, z+1/2; (xx) z, y, x+1; (xxi) z, y, x; (xxii) z+1/2, x1/2, y+1/2; (xxiii) x, y, z+1; (xxiv) x+1/2, z+1/2, y+1/2; (xxv) x+1/2, z1/2, y+1/2; (xxvi) y, x, z; (xxvii) y1/2, x+1/2, z+1/2; (xxviii) x, y+1, z; (xxix) y, x+1, z; (xxx) x+1/2, z+1/2, y+1/2; (xxxi) z+1, x, y; (xxxii) x, z, y; (xxxiii) x, z+1, y; (xxxiv) x+1/2, y+1/2, z1/2; (xxxv) y+1/2, x+1/2, z1/2; (xxxvi) y+1/2, x+1/2, z+1/2; (xxxvii) z, y+1, x; (xxxviii) z+1, y, x; (xxxix) y+1/2, z1/2, x+1/2; (xl) y, x, z+1; (xli) z1/2, x+1/2, y+1/2; (xlii) z+1/2, y+1/2, x+1/2; (xliii) z, x, y; (xliv) y, z, x.

Experimental details

Crystal data
Chemical formulaMo2.603Nd4.365O16.47Pb0.335
Mr1212.3
Crystal system, space groupCubic, Pn3n
Temperature (K)293
a (Å)11.0421 (11)
V3)1346.3 (2)
Z4
Radiation typeMo Kα
µ (mm1)23.12
Crystal size (mm)0.30 × 0.30 × 0.30 × 0.15 (radius)
Data collection
DiffractometerOxford Diffraction CCD
diffractometer
Absorption correctionFor a sphere
Jana2006 (Petricek, Dusek & Palatinus, 2000)
Tmin, Tmax0.895, 1.000
No. of measured, independent and
observed [I > 3σ(I)] reflections
111689, 1174, 771
Rint0.032
(sin θ/λ)max1)1.072
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.020, 0.057, 1.06
No. of reflections1174
No. of parameters48
Δρmax, Δρmin (e Å3)0.80, 0.79

 

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