On the stoichiometry breadth of YbIn1−xRhxCu4 [x = 0.19 (3)]

Bobev, S.; Fritsch, V.

doi:10.1107/S1600536806029941

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On the stoichiometry breadth of YbIn_1-xRh_xCu₄ [x = 0.19 (3)]

S. Bobev and V. Fritsch

Ytterbium indium rhodium tetracopper, YbIn_1-xRh_xCu₄ [x = 0.19 (3)], an Rh-substituted version of the compound YbInCu₄, has been synthesized from the correspondng elements using a Cu/In flux. Its structure is a substitutional derivative of the AuBe₅ type (Pearson code cF24). All atoms occupy special positions: Yb (site symmetry $\overline{4}$ 3m), In/Rh ( $\overline{4}$ 3m) and Cu (.3m). A greater Rh content in the solid solutions, although possible, could not be confirmed by structure analyses due to poor quality of the single crystals.

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Supporting information

	Crystallographic Information File (CIF) https://doi.org/10.1107/S1600536806029941/wm2024sup1.cif Contains datablocks global, I
	Structure factor file (CIF format) https://doi.org/10.1107/S1600536806029941/wm2024Isup2.hkl Contains datablock I

checkCIF report

Key indicators

Single-crystal X-ray study
T = 100 K
Mean (b-Cu) = 0.000 Å
Disorder in main residue
R factor = 0.014
wR factor = 0.036
Data-to-parameter ratio = 10.7

checkCIF/PLATON results

No syntax errors found



Alert level C
PLAT041_ALERT_1_C Calc. and Rep. SumFormula Strings    Differ ....          ?
PLAT045_ALERT_1_C Calculated and Reported Z Differ by ............       0.25 Ratio
PLAT061_ALERT_3_C Tmax/Tmin Range Test RR' too Large .............       0.82
PLAT077_ALERT_4_C Unitcell contains non-integer number of atoms ..          ?
PLAT301_ALERT_3_C Main Residue  Disorder .........................      21.00 Perc.
PLAT711_ALERT_1_C BOND    Unknown or Inconsistent Label ..........      IN/RH
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                    IN/RH  CU     IN/RH
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  28.455
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  51.545
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  74.554
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  76.456
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  52.465
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  75.546
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  27.645
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  50.564
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  26.654
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  25.444
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  49.444
PLAT731_ALERT_1_C Bond    Calc   2.9637(4), Rep 2.96371(13) ......       3.08 su-Ra
              YB   -CU      1.555  73.444

Alert level G
REFLT03_ALERT_4_G Please check that the estimate of the number of Friedel pairs is
            correct. If it is not, please give the correct count in the
            _publ_section_exptl_refinement section of the submitted CIF.
           From the CIF: _diffrn_reflns_theta_max           33.00
           From the CIF: _reflns_number_total                 96
           Count of symmetry unique reflns           55
           Completeness (_total/calc)            174.55%
           TEST3: Check Friedels for noncentro structure
           Estimate of Friedel pairs measured        41
           Fraction of Friedel pairs measured     0.745
           Are heavy atom types Z>Si present        yes

   0 ALERT level A = In general: serious problem
   0 ALERT level B = Potentially serious problem
 128 ALERT level C = Check and explain
   1 ALERT level G = General alerts; check

 125 ALERT type 1 CIF construction/syntax error, inconsistent or missing data
   0 ALERT type 2 Indicator that the structure model may be wrong or deficient
   2 ALERT type 3 Indicator that the structure quality may be low
   2 ALERT type 4 Improvement, methodology, query or suggestion
   0 ALERT type 5 Informative message, check

Computing details top

Data collection: SMART (Bruker, 2002); cell refinement: SAINT (Bruker, 2002); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2001); program(s) used to refine structure: SHELXTL (Sheldrick, 2001); molecular graphics: XP in SHELXTL; software used to prepare material for publication: SHELXTL.

Ytterbium indium rhodium tetracopper top

Crystal data top

YbIn_0.81Rh_0.19Cu₄	D_x = 9.820 Mg m⁻³
M_r = 539.73	Mo Kα radiation, λ = 0.71073 Å
Cubic, F43m	Cell parameters from 1381 reflections
Hall symbol: F -4 2 3	θ = 5–33°
a = 7.1469 (2) Å	µ = 53.84 mm⁻¹
V = 365.05 (2) Å³	T = 100 K
Z = 4	Irregular fragment, grey
F(000) = 937	0.06 × 0.05 × 0.04 mm

Data collection top

Bruker SMART APEX diffractometer	96 independent reflections
Radiation source: fine-focus sealed tube	96 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.054
Detector resolution: 8.3 pixels mm^-1	θ_max = 33.0°, θ_min = 4.9°
ω scans	h = −10→10
Absorption correction: multi-scan (SADABS; Sheldrick, 2003)	k = −10→10
T_min = 0.040, T_max = 0.115	l = −10→10
1381 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	w = 1/[σ²(F_o²) + (0.0202P)²] where P = (F_o² + 2F_c²)/3
R[F² > 2σ(F²)] = 0.014	(Δ/σ)_max < 0.001
wR(F²) = 0.036	Δρ_max = 1.09 e Å⁻³
S = 1.21	Δρ_min = −0.93 e Å⁻³
96 reflections	Extinction correction: SHELXTL, Fc^*=kFc[1+0.001xFc²λ³/sin(2θ)]^-1/4
9 parameters	Extinction coefficient: 0.0118 (7)
0 restraints	Absolute structure: Flack (1983), 40 Friedel pairs
Primary atom site location: structure-invariant direct methods	Absolute structure parameter: 0.04 (3)

Special details top

Experimental. Data collection is performed with four batch runs at φ = 0.00 ° (450 frames), at φ = 90.00 ° (450 frames), at φ = 180.00 ° (450 frames), and at φ = 270.00 (450 frames). Frame width = 0.40 \& in ω. Data are merged, corrected for decay, and treated with multi-scan absorption corrections.

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq	Occ. (<1)
Yb	0.0000	0.0000	0.0000	0.0052 (2)
In	0.2500	0.2500	0.2500	0.0043 (3)	0.81 (3)
Rh	0.2500	0.2500	0.2500	0.0043 (3)	0.19 (3)
Cu	0.62465 (5)	0.62465 (5)	0.62465 (5)	0.0038 (2)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Yb	0.0052 (2)	0.0052 (2)	0.0052 (2)	0.000	0.000	0.000
In	0.0043 (3)	0.0043 (3)	0.0043 (3)	0.000	0.000	0.000
Rh	0.0043 (3)	0.0043 (3)	0.0043 (3)	0.000	0.000	0.000
Cu	0.0038 (2)	0.0038 (2)	0.0038 (2)	−0.00031 (14)	−0.00031 (14)	−0.00031 (14)

Geometric parameters (Å, º) top

Yb—Cuⁱ	2.9637 (1)	In/Rh—Cu^vii	2.9622 (1)
Yb—Cuⁱⁱ	2.9637 (1)	In/Rh—Cu^viii	2.9622 (1)
Yb—Cuⁱⁱⁱ	2.9637 (1)	In/Rh—Cu^ix	2.9622 (1)
Yb—Cu^iv	2.9637 (1)	In/Rh—Cu^xvi	2.9622 (1)
Yb—Cu^v	2.9637 (1)	In/Rh—Cu^xvii	2.9622 (1)
Yb—Cu^vi	2.9637 (1)	In/Rh—Cu^xviii	2.9622 (1)
Yb—Cu^vii	2.9637 (1)	Cu—Cu^xiii	2.5197 (10)
Yb—Cu^viii	2.9637 (1)	Cu—Cu^xiv	2.5197 (10)
Yb—Cu^ix	2.9637 (1)	Cu—Cu^xv	2.5197 (10)
Yb—Cu^x	2.9637 (1)	Cu—Cu^xix	2.5339 (10)
Yb—Cu^xi	2.9637 (1)	Cu—Cu^xx	2.5339 (10)
Yb—Cu^xii	2.9637 (1)	Cu—Cu^xxi	2.5339 (10)
In/Rh—Cu^xiii	2.9622 (1)	Cu—In/Rh^xxii	2.9622 (1)
In/Rh—Cu^xiv	2.9622 (1)	Cu—Rh^xxii	2.9622 (1)
In/Rh—Cu^xv	2.9622 (1)	Cu—Rh^xxiii	2.9622 (1)
In/Rh—Cu^iv	2.9622 (1)	Cu—Rh^xxiv	2.9622 (1)
In/Rh—Cu^v	2.9622 (1)	Cu—In/Rh^xxiii	2.9622 (1)
In/Rh—Cu^vi	2.9622 (1)	Cu—In/Rh^xxiv	2.9622 (1)

Cuⁱ—Yb—Cuⁱⁱ	50.617 (19)	Cu^xv—In/Rh—Cu^viii	117.083 (7)
Cuⁱ—Yb—Cuⁱⁱⁱ	50.617 (19)	Cu^iv—In/Rh—Cu^viii	95.248 (4)
Cuⁱⁱ—Yb—Cuⁱⁱⁱ	50.617 (19)	Cu^v—In/Rh—Cu^viii	50.341 (19)
Cuⁱ—Yb—Cu^iv	116.988 (7)	Cu^vi—In/Rh—Cu^viii	50.64 (2)
Cuⁱⁱ—Yb—Cu^iv	95.184 (4)	Cu^vii—In/Rh—Cu^viii	95.248 (4)
Cuⁱⁱⁱ—Yb—Cu^iv	145.014 (15)	Cu^xiii—In/Rh—Cu^ix	95.248 (4)
Cuⁱ—Yb—Cu^v	116.988 (7)	Cu^xiv—In/Rh—Cu^ix	144.792 (15)
Cuⁱⁱ—Yb—Cu^v	145.014 (15)	Cu^xv—In/Rh—Cu^ix	117.083 (7)
Cuⁱⁱⁱ—Yb—Cu^v	95.184 (4)	Cu^iv—In/Rh—Cu^ix	50.64 (2)
Cu^iv—Yb—Cu^v	116.988 (7)	Cu^v—In/Rh—Cu^ix	95.248 (4)
Cuⁱ—Yb—Cu^vi	95.184 (4)	Cu^vi—In/Rh—Cu^ix	95.248 (4)
Cuⁱⁱ—Yb—Cu^vi	116.988 (7)	Cu^vii—In/Rh—Cu^ix	50.341 (19)
Cuⁱⁱⁱ—Yb—Cu^vi	145.014 (15)	Cu^viii—In/Rh—Cu^ix	117.083 (7)
Cu^iv—Yb—Cu^vi	50.31 (2)	Cu^xiii—In/Rh—Cu^xvi	50.64 (2)
Cu^v—Yb—Cu^vi	95.184 (4)	Cu^xiv—In/Rh—Cu^xvi	95.248 (4)
Cuⁱ—Yb—Cu^vii	145.014 (15)	Cu^xv—In/Rh—Cu^xvi	95.248 (4)
Cuⁱⁱ—Yb—Cu^vii	116.988 (7)	Cu^iv—In/Rh—Cu^xvi	95.248 (4)
Cuⁱⁱⁱ—Yb—Cu^vii	95.184 (4)	Cu^v—In/Rh—Cu^xvi	95.248 (4)
Cu^iv—Yb—Cu^vii	95.184 (4)	Cu^vi—In/Rh—Cu^xvi	144.792 (15)
Cu^v—Yb—Cu^vii	50.617 (19)	Cu^vii—In/Rh—Cu^xvi	50.341 (19)
Cu^vi—Yb—Cu^vii	116.988 (7)	Cu^viii—In/Rh—Cu^xvi	144.792 (15)
Cuⁱ—Yb—Cu^viii	95.184 (4)	Cu^ix—In/Rh—Cu^xvi	50.341 (19)
Cuⁱⁱ—Yb—Cu^viii	145.014 (15)	Cu^xiii—In/Rh—Cu^xvii	95.248 (4)
Cuⁱⁱⁱ—Yb—Cu^viii	116.988 (7)	Cu^xiv—In/Rh—Cu^xvii	50.64 (2)
Cu^iv—Yb—Cu^viii	95.184 (4)	Cu^xv—In/Rh—Cu^xvii	95.248 (4)
Cu^v—Yb—Cu^viii	50.31 (2)	Cu^iv—In/Rh—Cu^xvii	144.792 (15)
Cu^vi—Yb—Cu^viii	50.617 (19)	Cu^v—In/Rh—Cu^xvii	50.341 (19)
Cu^vii—Yb—Cu^viii	95.184 (4)	Cu^vi—In/Rh—Cu^xvii	95.248 (4)
Cuⁱ—Yb—Cu^ix	145.014 (15)	Cu^vii—In/Rh—Cu^xvii	95.248 (4)
Cuⁱⁱ—Yb—Cu^ix	95.184 (4)	Cu^viii—In/Rh—Cu^xvii	50.341 (19)
Cuⁱⁱⁱ—Yb—Cu^ix	116.988 (7)	Cu^ix—In/Rh—Cu^xvii	144.792 (15)
Cu^iv—Yb—Cu^ix	50.617 (19)	Cu^xvi—In/Rh—Cu^xvii	117.083 (7)
Cu^v—Yb—Cu^ix	95.184 (4)	Cu^xiii—In/Rh—Cu^xviii	95.248 (4)
Cu^vi—Yb—Cu^ix	95.184 (4)	Cu^xiv—In/Rh—Cu^xviii	95.248 (4)
Cu^vii—Yb—Cu^ix	50.31 (2)	Cu^xv—In/Rh—Cu^xviii	50.64 (2)
Cu^viii—Yb—Cu^ix	116.988 (7)	Cu^iv—In/Rh—Cu^xviii	50.341 (19)
Cuⁱ—Yb—Cu^x	50.31 (2)	Cu^v—In/Rh—Cu^xviii	144.792 (15)
Cuⁱⁱ—Yb—Cu^x	95.184 (4)	Cu^vi—In/Rh—Cu^xviii	50.341 (19)
Cuⁱⁱⁱ—Yb—Cu^x	95.184 (4)	Cu^vii—In/Rh—Cu^xviii	144.792 (15)
Cu^iv—Yb—Cu^x	95.184 (4)	Cu^viii—In/Rh—Cu^xviii	95.248 (4)
Cu^v—Yb—Cu^x	95.184 (4)	Cu^ix—In/Rh—Cu^xviii	95.248 (4)
Cu^vi—Yb—Cu^x	50.617 (19)	Cu^xvi—In/Rh—Cu^xviii	117.083 (7)
Cu^vii—Yb—Cu^x	145.014 (15)	Cu^xvii—In/Rh—Cu^xviii	117.083 (7)
Cu^viii—Yb—Cu^x	50.617 (19)	Cu^xiii—Cu—Cu^xiv	60.001 (1)
Cu^ix—Yb—Cu^x	145.014 (15)	Cu^xiii—Cu—Cu^xv	60.001 (1)
Cuⁱ—Yb—Cu^xi	95.184 (4)	Cu^xiv—Cu—Cu^xv	60.001 (1)
Cuⁱⁱ—Yb—Cu^xi	50.31 (2)	Cu^xiii—Cu—Cu^xix	179.999 (11)
Cuⁱⁱⁱ—Yb—Cu^xi	95.184 (4)	Cu^xiv—Cu—Cu^xix	120.0
Cu^iv—Yb—Cu^xi	50.617 (19)	Cu^xv—Cu—Cu^xix	120.0
Cu^v—Yb—Cu^xi	145.014 (15)	Cu^xiii—Cu—Cu^xx	120.0
Cu^vi—Yb—Cu^xi	95.184 (4)	Cu^xiv—Cu—Cu^xx	180.00 (2)
Cu^vii—Yb—Cu^xi	95.184 (4)	Cu^xv—Cu—Cu^xx	120.0
Cu^viii—Yb—Cu^xi	145.014 (15)	Cu^xix—Cu—Cu^xx	60.0
Cu^ix—Yb—Cu^xi	50.617 (19)	Cu^xiii—Cu—Cu^xxi	120.0
Cu^x—Yb—Cu^xi	116.988 (7)	Cu^xiv—Cu—Cu^xxi	120.0
Cuⁱ—Yb—Cu^xii	95.184 (4)	Cu^xv—Cu—Cu^xxi	179.999 (11)
Cuⁱⁱ—Yb—Cu^xii	95.184 (4)	Cu^xix—Cu—Cu^xxi	60.0
Cuⁱⁱⁱ—Yb—Cu^xii	50.31 (2)	Cu^xx—Cu—Cu^xxi	60.0
Cu^iv—Yb—Cu^xii	145.014 (15)	Cu^xiii—Cu—In/Rh^xxii	115.324 (11)
Cu^v—Yb—Cu^xii	50.617 (19)	Cu^xiv—Cu—In/Rh^xxii	64.830 (9)
Cu^vi—Yb—Cu^xii	145.014 (15)	Cu^xv—Cu—In/Rh^xxii	64.830 (9)
Cu^vii—Yb—Cu^xii	50.617 (19)	Cu^xix—Cu—In/Rh^xxii	64.678 (11)
Cu^viii—Yb—Cu^xii	95.184 (4)	Cu^xx—Cu—In/Rh^xxii	115.169 (10)
Cu^ix—Yb—Cu^xii	95.184 (4)	Cu^xxi—Cu—In/Rh^xxii	115.169 (10)
Cu^x—Yb—Cu^xii	116.988 (7)	In/Rh^xxii—Cu—Rh^xxii	0.0
Cu^xi—Yb—Cu^xii	116.988 (7)	In/Rh^xxii—Cu—Rh^xxiii	117.084 (7)
Cu^xiii—In/Rh—Cu^xiv	50.341 (19)	In/Rh^xxii—Cu—Rh^xxiv	117.084 (7)
Cu^xiii—In/Rh—Cu^xv	50.341 (19)	Cu^xiii—Cu—In/Rh^xxiii	64.830 (9)
Cu^xiv—In/Rh—Cu^xv	50.341 (19)	Cu^xiv—Cu—In/Rh^xxiii	115.324 (11)
Cu^xiii—In/Rh—Cu^iv	117.083 (7)	Cu^xv—Cu—In/Rh^xxiii	64.830 (9)
Cu^xiv—In/Rh—Cu^iv	144.792 (15)	Cu^xix—Cu—In/Rh^xxiii	115.169 (10)
Cu^xv—In/Rh—Cu^iv	95.248 (5)	Cu^xx—Cu—In/Rh^xxiii	64.678 (11)
Cu^xiii—In/Rh—Cu^v	117.083 (7)	Cu^xxi—Cu—In/Rh^xxiii	115.169 (9)
Cu^xiv—In/Rh—Cu^v	95.248 (4)	In/Rh^xxii—Cu—In/Rh^xxiii	117.084 (7)
Cu^xv—In/Rh—Cu^v	144.792 (15)	Rh^xxii—Cu—In/Rh^xxiii	117.084 (7)
Cu^iv—In/Rh—Cu^v	117.083 (7)	Rh^xxiii—Cu—In/Rh^xxiii	0.0
Cu^xiii—In/Rh—Cu^vi	144.792 (15)	Rh^xxiv—Cu—In/Rh^xxiii	117.084 (7)
Cu^xiv—In/Rh—Cu^vi	117.083 (7)	Cu^xiii—Cu—In/Rh^xxiv	64.830 (9)
Cu^xv—In/Rh—Cu^vi	95.248 (5)	Cu^xiv—Cu—In/Rh^xxiv	64.830 (9)
Cu^iv—In/Rh—Cu^vi	50.341 (19)	Cu^xv—Cu—In/Rh^xxiv	115.324 (11)
Cu^v—In/Rh—Cu^vi	95.248 (4)	Cu^xix—Cu—In/Rh^xxiv	115.169 (9)
Cu^xiii—In/Rh—Cu^vii	95.248 (4)	Cu^xx—Cu—In/Rh^xxiv	115.169 (9)
Cu^xiv—In/Rh—Cu^vii	117.083 (7)	Cu^xxi—Cu—In/Rh^xxiv	64.678 (11)
Cu^xv—In/Rh—Cu^vii	144.792 (15)	In/Rh^xxii—Cu—In/Rh^xxiv	117.084 (7)
Cu^iv—In/Rh—Cu^vii	95.248 (4)	Rh^xxii—Cu—In/Rh^xxiv	117.084 (7)
Cu^v—In/Rh—Cu^vii	50.64 (2)	Rh^xxiii—Cu—In/Rh^xxiv	117.084 (7)
Cu^vi—In/Rh—Cu^vii	117.083 (7)	Rh^xxiv—Cu—In/Rh^xxiv	0.0
Cu^xiii—In/Rh—Cu^viii	144.792 (15)	In/Rh^xxiii—Cu—In/Rh^xxiv	117.084 (7)
Cu^xiv—In/Rh—Cu^viii	95.248 (5)

Symmetry codes: (i) x−1, −y+1/2, −z+1/2; (ii) −x+1/2, y−1, −z+1/2; (iii) −x+1/2, −y+1/2, z−1; (iv) x−1/2, −y+1/2, −z+1; (v) x−1/2, −y+1, −z+1/2; (vi) −x+1/2, y−1/2, −z+1; (vii) −x+1, y−1/2, −z+1/2; (viii) −x+1/2, −y+1, z−1/2; (ix) −x+1, −y+1/2, z−1/2; (x) x−1, y−1/2, z−1/2; (xi) x−1/2, y−1, z−1/2; (xii) x−1/2, y−1/2, z−1; (xiii) x, −y+1, −z+1; (xiv) −x+1, y, −z+1; (xv) −x+1, −y+1, z; (xvi) x, y−1/2, z−1/2; (xvii) x−1/2, y, z−1/2; (xviii) x−1/2, y−1/2, z; (xix) x, −y+3/2, −z+3/2; (xx) −x+3/2, y, −z+3/2; (xxi) −x+3/2, −y+3/2, z; (xxii) x, y+1/2, z+1/2; (xxiii) x+1/2, y, z+1/2; (xxiv) x+1/2, y+1/2, z.

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