Borate fluoride explained

The borate fluorides or fluoroborates are compounds containing borate or complex borate ions along with fluoride ions that form salts with cations such as metals. They are in the broader category of mixed anion compounds. They are not to be confused with tetrafluoroborates (BF4) or the fluorooxoborates which have fluorine bonded to boron.

Examples

formulanamemwsystemspace groupunit cell Åvolume Å3densitycommentreferences
Be2(BO3)(OH,F) · H2OBerboritetrigonalP3a = 4.434, c = 5.33490.82colourlessUniaxial (-) nω = 1.580 nε = 1.485

Max birefringence δ = 0.095

[1]
γ‐Be2BO3Fγ‐BBF95.83 trigonalR32a=4.4418 c=19.909 Z=3340.171.946 Uniaxial (-) SHG 2.3 × KDP
NH4Be2BO3F2ABBF132.87trigonalR32a=4.4398 c=12.4697 Z=3212.872.243 Uniaxial (-) no=1.49389 ne=1.41919 at 636 nm[2]
NaBe2BO3F2sodium beryllium borate fluoride (NBBF)C2a=12.643 b=8.729 c=7.591 β=113.6°768double layers of borate rings sandwiching barium atoms. Between pairs of double layers are sodium ions with fluoride.[3]
Mg2(BO3)(F,OH)Pertsevite-(F)orthorhombicPna21a = 20.49, b = 4.571, c = 11.89 Z=161,113.6Density 3.12transparent

Biaxial (+) nα = 1.609 nβ = 1.620 nγ = 1.642

2V: 65°

Max birefringence: δ = 0.033

[4]
Mg3(BO3)(F,OH)3Fluoboritehexagonala = 8.8, c = 3.1208colourlessUniaxial (-) nω = 1.570 nε = 1.534

Max birefringence δ = 0.036

[5]
Mg3(OH)[B(OH)<sub>4</sub>]2(SO4)FsulfoboriteorthorhombicPnmaa=10.132 b=12.537 c=7.775987.6Biaxial (-) nα = 1.527 nβ = 1.536 nγ = 1.5512V 79°

Max birefringence δ = 0.024

[6]
Na6Mg3B10O18F6monoclinicP21/ca=13.420 b=6.400 c=10.701 β=90.693°band gap 5.40 eV; birefringence Δn = 0.039 at 1064 nm[7]
NaMgBe2(BO3)2FNMBBFPc1a=4.5408 c=13.439birefringence 0.081 at 546.1 nm[8]
Al6(BO3)5F3JeremejevitehexagonalP63/ma = 8.5591, c = 8.1814519density 3.28

Uniaxial (-) nω = 1.653 nε = 1.640

Max birefringence δ = 0.013

[9] [10]
Al8(BO3)4(B2O5)F8704.7tetragonalP42/mmca=9.134 c=19.112 Z=41,595density 2.935 colourless
Na(Mg3)Al6(Si6O18)(BO3)3(OH)3FFluor-dravitetrigonalR3ma = 15.955, c = 7.153 Z=31,577density 3.120dark brown

Uniaxial (-) nω = 1.645(2) nε = 1.621(2)

Max birefringence δ = 0.024

[11]
Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FFluor-elbaitetrigonalR3ma = 15.8933, c = 7.12221,558blue greenUniaxial (-)[12]
K6B12O19F4744.32orthorhombicPnmaa =15.291 b =7.707 c =8.672 Z=21022.02.419[13]
KBe2BO3F2 KBBFhexagonalR32a=4.427 c=18.744318.32.40Be2BO6F2 rings SHG 1.2 × KDP; UV cutoff 147 nm[14]
Ca5(BO3)3F[15]
Li3CaB2O5F363.04orthorhombicPnmaa=25.685 b=3.4697 c=5.4404 Z=2484.842.487colourless[16]
Li5Ca9(BO3)7F2P1
NaCaBe2B2O6F [17]
KCaBe2B2O6F467.64P3_1ca=4.705 c=14.554 Z=2279.12.783[18]
Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3FFluor-liddicoatitetrigonalR3ma = 15.875, c = 7.126 Z=31,555density 3.02Uniaxial (-) nω = 1.637 nε = 1.621

Max birefringence δ = 0.016

[19]
CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3FFluor-uvitetrigonalR3ma = 15.954, c = 7.214 Z=31,590blackUniaxial nω = 1.637 - 1.668 nε = 1.619 - 1.639

Max birefringence δ = 0.018 - 0.029

[20]
KCaBe2B2O6F
Sc2F2(B2O5)229.54orthorhombicPbama=9.667 b=14.199 c=4.0395 Z=4554.42.750colourless[21]
K11Sc5(B5O10)4F6orthorhombicFdd2a 56.769 b 12.207 c 12.6088transparent to <190 nm[22]
Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FFluor-tsilaisitetrigonalR3ma = 15.9398, c = 7.13631,570greenish yellowUniaxial (-)[23]
NaFe3Al6Si6B3O30F
Na(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FFluor-schorltrigonalR3ma = 16.005, c = 7.176 Z=31,591.9blackUniaxial (-) nω = 1.660 - 1.661 nε = 1.636 - 1.637

Max birefringence δ = 0.024

[24]
Na(Fe3+3)Al6(Si6O18)(BO3)3O3FFluor-buergeritetrigonalR3ma = 15.8692, c = 7.18821,568density 3.311brown

Uniaxial (-) nω = 1.735 nε = 1.655

Birefringence 0.080

[25]
Ca(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3FFluor-feruvite[26]
KCaZn2(BO3)2F
Li6RbB2O6F263.73orthorhombicPnmaa=8.41 b=15.96 c=5.08 Z=26822.568[27]
RbBe2BO3F2RBBFTrigonalR32a=4.434 c=19.758 z=3also contains BeO3F tetrahedra and BO3. It transmits radiation from 180 to 3500 nm.[28]
Rb18Mg6(B5O10)3(B7O14)2FmonoclinicC2/ca=11.06 b=19.70 c=31.01 β=90.13°[29]
RbCaBe2B2O6FTrigonalR32[30]
KSrBe2B2O6F
LiSr3Be3B3O9F4[31]
NaSr3Be3B3O9F4[32]
K3Sr3Li2Al4B6O20FSHG 4 × KDP; 170 nm UV cutoff
Ca(Y,REE,Ca,Na,Mn)15Fe2+(P,Si)Si6B3O34F14Proshchenkoite-(Y)trigonalR3ma = 10.7527, c = 27.40022,743.6brownish[33]
(Y,REE,Ca,Na)15(Al,Fe3+)(CaxAs3+1−x)(Si,As5+)Si6B3(O,F)48Hundholmenite-(Y)trigonalR3ma = 10.675, c = 27.02 Z=32,667density 5.206brownish

Uniaxial (-)

[34]
(Na,Ca)3(Y,Ce)12Si6B2O27F14Okanoganite-(Y)trigonalR3ma = 10.7108, c = 27.0404.35Tan colouredUniaxial (-) nω = 1.753 nε = 1.740

Max birefringence δ = 0.013

[35]
? Y5(SiO4,BO4)3(O,OH,F)Tritomite-(Y)?hexagonala = 9.32, c = 6.843.05-3.4isotropicn = 1.627 - 1.685
Cd8B5O15F1212.25cubicFdma = 13.972 Z = 82,7275.904colourless[36]
CdZn2KB2O6F
Li3Cs6Al2B14O28F1490.58orthorhombicPnmaa=21.8412 b=19.8875 c=7.1577 Z=43109.13.184[37]
CsBe2BO3F2247.74trigonalR32a=4.4575 c=21.310 Z=3366.73.366colourless[38]
Cs18Mg6(B5O10)3(B7O14)2FmonoclinicC2/ca=11.234 b=20.11 c=32.12 β=90.225°
CsCaBe2B2O6FtrigonalR32[39]
BaBOF3221.15monoclinicP21/ca = 4.620 b = 15.186 c = 4.426 β = 92.045° Z=4310.3contains chains of -OB(F2)- and a double chain of BaF[40]
Ba5(BO3)3F[41]
Li2BaSc(BO3)2F332.80hexagonalP63/ma=4.895 c=14.346297.73.713[42]
LiBa12(BO3)7F4I4/mcm
BaBe2BO3F3271.16hexagonalP63a=7.628 c=13.990 Z=6704.93.832UV cutoff <185 nm; birefringence 0,081 at 200 nm[43]
NaBa12(BO3)7F4I4/mcm
BaMgBe2(BO3)2F2BMBBF335.283trigonalPc1a=4.5898 c=15.348280.013.976colourless [Be<sub>2</sub>B<sub>3</sub>O<sub>6</sub>F<sub>2</sub>][44]
Ba3.75MgB7O14F2.5886.50monoclinicC2/ca 16.611 b 13.677 c 15.141 β 121.239° Z=82941.04.004transparent > 203 nm; birefringence 0.081@546 nm[45]
BaAl(BO3)F2hexagonalPa=4.8879 c=9.403 Z=2194.5UV cutoff 165 nm[46]
K3Ba3Li2Al4B6O20F
K5Ba10(BO3)8FtrigonalRca = 15.293, c = 22.699 Z = 6[47]
KBa7Mg2B14O28F5monoclinicC2/ca = 16.638 b = 13.609 c = 15.214 β = 121.309° Z=42943.33.934colourless[48]
BaCaBe2(BO3)2F2BCBBFtrigonalPc1a=4.6931 c=16.049306.123.808colourless [Be<sub>2</sub>B<sub>3</sub>O<sub>6</sub>F<sub>2</sub>]
Li2BaSc(BO3)2FhexagonalP63/ma=4.895 c=14.346[49]
Ba3Zn(BO3)(B2O5)F656.82monoclinicP21/ca = 15.179 b = 7.0064 c = 8.763 β = 100.15° Z=4917.44.755colourless[50]
Ba4Zn2(BO3)2(B2O5)F2937.34monoclinicC2/ca=20.39 b=4.998 c=13.068 β = 192.59 Z=441,3314.679colourless
BaZnBe2(BO3)2F2376.35trigonalPa = 4.5998, c = 7.7037 Z = 1141.164.427colourless[51]
Rb3Ba3Li2Al4B6O20F
BaCdBe2(BO3)2F2BDBBFPc1a=4.6808 c=15.788
Ba1.09Pb0.91Be2(BO3)2F2BPBBFtrigonalPm1a = 4.7478 c = 8.386, Z = 1163.70UV absorption edge=279.1 nm; birefringence 0.054 at 546.1 nm; 2D [Be<sub>3</sub>B<sub>3</sub>O<sub>6</sub>F<sub>3</sub>] layer[52]
LiBa2Pb(BO3)2ForthorhombicPmmna=5.487 b=15.96 c=4.034
KNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11TienshanitehexagonalP6/ma = 16.785, c = 10.454 Z=12,551pale olive greenUniaxial (-) nω = 1.666 nε = 1.653

Max birefringence δ = 0.013

[53]
Ca6(Fe2+,Mn2+)Y3REE7(SiO4)3(PO4)(B3Si3O18)(BO3)F11Laptevite-(Ce)trigonalR3ma = 10.804, c = 27.726 Z=32,803density 4.61dark brown

Uniaxial (-) nω = 1.741(3) nε = 1.720(3)

Max birefringence δ = 0.021

[54]
Ba(Y,Ce)6Si3B6O24F2Cappelenite-(Y)trigonalP3a = 10.67, c = 4.68 Z=14614.407greenish brown[55]
CaMg[(Ce<sub>7</sub>Y<sub>3</sub>)Ca<sub>5</sub>](SiO4)4(Si2B3AsO18)(BO3)F11Arrheniusite-(Ce)trigonalR3ma = 10.8082, c = 27.5196[56]
Gd4(BO2)O5ForthorhombicPmmna=15.746 b=3.8142 c=6.609 Z=2396.96.45colourless[57]
Gd2(BO3)F3
Gd3(BO3)2F3
Gd4[B<sub>4</sub>O<sub>11</sub>]F2
Ba2Gd(BO3)2ForthorhombicPnmaa = 7.571 b = 10.424 c = 8.581 Z = 2[58]
Eu5(BO3)3ForthorhombicPnmaa=7.225 b=14.124 c=9.859 Z=41006.16.306yellow[59]
TlBe2BO3F2TrigonalR32a=4.4387 c=19.942 Z=3340.274.673colourless[60]
LiBa2Pb(BO3)2ForthorhombicPmmna=5.487 b=15.97 c=4.034353.45.887colourless[61]
(Ca,Ce,La,Th)15As5+(As3+0.5,Na0.5)Fe3+Si6B4O40F7Vicanite-(Ce)trigonalR3ma=10.881 c=27.332,7664.82greenish yellowUniaxial (-) nω = 1.757 nε = 1.722

Max birefringence δ = 0.035

[62]

Notes and References

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  7. Cheng . Bingliang . Ma . Wenjuan . Tudi . Abudukadi . Liu . Changyou . Long . Xifa . Yang . Yun . 2023-07-26 . Introduction of the [B–O/F] Units Enhances the Band Gap and Birefringence from Na 6 Mg 3 B 10 O 18 F 6 to K 3 NaB 10 O 16 F 2 ]. Inorganic Chemistry . 62 . 31 . 12187–12191 . en . 10.1021/acs.inorgchem.3c01954 . 37494127 . 260200530 . 0020-1669.
  8. Guo . Ruixin . Jiang . Xingxing . Guo . Shu . Xia . Mingjun . Liu . Lijuan . Lin . Zheshuai . Wang . Xiaoyang . 2022-05-16 . Realization of Enlarged Birefringence from BaCdBe 2 (BO 3) 2 F 2 to NaMgBe 2 (BO 3) 2 F via the Cation Size Effect as a Potential Deep-Ultraviolet Birefringent Material . Inorganic Chemistry . en . 61 . 19 . 7624–7630 . 10.1021/acs.inorgchem.2c00880 . 0020-1669.
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  25. Web site: Fluor-buergerite. 2020-12-15. www.mindat.org.
  26. Web site: Fluor-feruvite. 2020-12-15. www.mindat.org.
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