Langbeinites

From Wikipedia, the free encyclopedia

Langbeinites are a family of crystalline substances based on the structure of langbeinite with general formula M
2M'
2(SO
4)
3, where M is a large univalent cation (such as potassium, rubidium, caesium, or ammonium), and M' is a small divalent cation (for example, magnesium, calcium, manganese, iron, cobalt, nickel, copper, zinc or cadmium). The sulfate group, SO2−
4, can be substituted by other tetrahedral anions with a double negative charge such as tetrafluoroberyllate (BeF2−
4), selenate (SeO2−
4), chromate (CrO2−
4), molybdate (MoO2−
4), or tungstates. Although monofluorophosphates are predicted, they have not been described. By redistributing charges other anions with the same shape such as phosphate also form langbeinite structures. In these the M' atom must have a greater charge to balance the extra three negative charges.

At higher temperatures the crystal structure is cubic P213.[1] However, the crystal structure may change to lower symmetries at lower temperatures, for example, P21, P1, or P212121.[1] Usually this temperature is well below room temperature, but in a few cases the substance must be heated to acquire the cubic structure.

Crystal structure[]

The crystal structures of langbeinites consist of a network of oxygen vertex-connected tetrahedral polyanions (such as sulfate) and distorted metal ion-oxygen octahedra.[2] The unit cell contains four formula units. In the cubic form the tetrahedral anions are slightly rotated from the main crystal axes. When cooled, this rotation disappears and the tetrahedra align, resulting in lower energy as well as lower crystal symmetry.

Examples[]

Sulfates include dithallium dicadmium sulfate,[3] Dirubidium dicadmium sulfate[4] dipotassium dicadmium sulfate,[5] dithallium manganese sulfate.[6] dirubidium dicalcium trisulfate.[7]

Selenates include diammonium dimanganese selenate.[1] A diammonium dicadmium selenate langbeinite could not be crystallised from water, but a trihydrate exists.[8]

Chromate based langbeinites include dicaesium dimanganese chromate.[1]

Molybdates include Rb
2Co
2(MoO
4)
3.[1] Potassium members are absent, as are zinc and copper containing solids, which all crystallize in different forms. Manganese, magnesium, cadmium and some nickel double molybdates exist as langbeinites.[9]

Double tungstates of the form A
2B
2(WO
4)
3 are predicted to exist in the langbeinite form.[10]

An examples with tetrafluroberyllate is dipotassium dimanganese tetrafluoroberyllate (K
2Mn
2(BeF
4)
3).[11] Other tetrafluoroberyllates may include: Rb
2Mg
2(BeF
4)
3; Tl
2Mg
2(BeF
4)
3; Rb
2Mn
2(BeF
4)
3; Tl
2Mn
2(BeF
4)
3; Rb
2Ni
2(BeF
4)
3; Tl
2Ni
2(BeF
4)
3; Rb
2Zn
2(BeF
4)
3; Tl
2Zn
2(BeF
4)
3; Cs
2Ca
2(BeF
4)
3; Rb
2Ca
2(BeF
4)
3; RbCsMnCd(BeF
4)
3; Cs
2MnCd(BeF
4)
3; RbCsCd
2(BeF
4)
3; Cs
2Cd
2(BeF
4)
3; Tl
2Cd
2(BeF
4)
3; (NH
4)
2Cd
2(BeF
4)
3; KRbMnCd(BeF
4)
3; K
2MnCd(BeF
4)
3; Rb
2MnCd(BeF
4)
3; Rb
2Cd
2(BeF
4)
3; RbCsCo
2(BeF
4)
3; (NH
4)
2Co
2(BeF
4)
3; K
2Co
2(BeF
4)
3; Rb
2Co
2(BeF
4)
3; Tl
2Co
2(BeF
4)
3; RbCsMn
2(BeF
4)
3; Cs
2Mn
2(BeF
4)
3; RbCsZn
2(BeF
4)
3; (NH
4)
2Mg
2(BeF
4)
3; (NH
4)
2Mn
2(BeF
4)
3; (NH
4)
2Ni
2(BeF
4)
3; (NH
4)
2Zn
2(BeF
4)
3;KRbMg
2(BeF
4)
3; K
2Mg
2(BeF
4)
3; KRbMn
2(BeF
4)
3; K
2Ni
2(BeF
4)
3; K
2Zn
2(BeF
4)
3.[12]

The phosphate containing langbeinites were found in 1972 with the discovery of KTi
2(PO
4)
3, and since then a few more phosphates that also contain titanium have been found such as Na
2FeTi(PO
4)
3 and Na
2CrTi(PO
4)
3. By substituting metals in A
2MTi(PO
4)
3, A from (K, Rb, Cs), and M from (Cr, Fe, V), other langbeinites are made. The NASICON-type structure competes for these kinds of phosphates, so not all possibilities are langbeinites.[1] Other phosphate based substances include K
2YTi(PO
4)
3, K
2ErTi(PO
4)
3, K
2YbTi(PO
4)
3, K
2CrTi(PO
4)
3,[1] K
2AlSn(PO
4)
3,[13] KRbYbTi(PO
4)
3.[14] Sodium barium diiron tris-(phosphate) (NaBaFe
2(PO
4)
3) is yet another variation with the same structure but differently charged ions.[15] Most phosphates of this kind of formula do not form langbeinites, instead crystallise in the NASICON structure with archetype Na
3Zr
2(PO
4)(SiO
4)
2.[1]

A langbeinite with arsenate is known to exist by way of K
2ScSn(AsO
4)
3.[16]

Properties[]

Physical properties[]

Lanbeinite crystals can show ferroelectric or ferroelastic properties.[1] Diammonium dicadmium sulfate identified by Jona and Pepinsky[17] with a unit cell size of 10.35 Å becomes ferroelectric when the temperature drops below 95 K.[18] The phase transition temperature is not fixed, and can vary depending on the crystal or history of temperature change. So for example the phase transition in diammonium dicadmium sulfate can occur between 89 and 95 K.[19] Under pressure the highest phase transition temperature increases. ∂T/∂P = 0.0035 degrees/bar. At 824 bars there is a triple point with yet another transition diverging at a slope of ∂T/∂P = 0.103 degrees/bar.[20] For dipotassium dimanganese sulfate pressure causes the transition to rise at the rate of 6.86 °C/kbar. The latent heat of the transition is 456 cal/mol.[21]

Dithallium dicadmium sulfate was shown to be ferroelectric in 1972.[22]

Dipotassium dicadmium sulfate is thermoluminescent with stronger outputs of light at 350 and 475 K. This light output can be boosted forty times with a trace amount of samarium.[23] Dipotassium dimagnesium sulfate doped with dysprosium develops thermoluminescence and mechanoluminescence after being irradiated with gamma rays.[24] Since gamma rays occur naturally, this radiation induced thermoluminescence can be used to date evaporites in which langbeinite can be a constituent.[25]

At higher temperatures the crystals take on cubic form, whereas at the lowest temperatures they can transform to an orthorhombic crystal group. For some types there are two more phases, and as the crystal is cooled it goes from cubic, to monoclinic, to triclinic to orthorhombic. This change to higher symmetry on cooling is very unusual in solids.[26] For some langbeinites only the cubic form is known, but that may be because it has not been studied at low enough temperatures yet. Those that have three phase transitions go through these crystallographic point groups: P213 – P21 – P1 – P212121, whereas the single phase change crystals only have P213 – P212121.

K
2Cd
2(SO
4)
3 has a transition temperature above room temperature, so that it is ferroelectric in standard conditions. The orthorhombic cell size is a=10.2082 Å, b=10.2837 Å, c=10.1661 Å.[27]

Where the crystals change phase there is a discontinuity in the heat capacity. The transitions may show thermal hysteresis.[28]

Different cations can be substituted so that for example K
2Cd
2(SO
4)
3 and Tl
2Cd
2(SO
4)
3 can form solid solutions for all ratios of thallium and potassium. Properties such as the phase transition temperature and unit cell sizes vary smoothly with the composition.[29]

Langbeinites containing transition metals can be coloured. For example, cobalt langbeinite shows a broad absorption around 555 nm due to the cobalt 4T1g(F)→4T1g(P) electronic transition.[30]

The enthalpy of formation (ΔfHm) for solid (NH
4)
2Cd
2(SO
4)
3 at 298.2 K is −3031.74±0.08 kJ/mol, and for K
2Cd
2(SO
4)
3 it is −3305.52±0.17 kJ/mol.[31]

Sulfates[]

Properties of langbeinites with sulfate anions
Formula Weight (g/mol) Comment / Symmetries Transition temperature (K) Density Cell size (Å) Refractive index
1 2 3[32]
Na
2Mg
2(SO
4)
3 		382.78 3 phases, 1-2,>3 250 350 575[33]
K
2Mg
2(SO
4)
3 		414.99 4 phases Langbeinite 51 54.9 63.8 2.832[34] 9.9211[35] 1.536[36]
Rb
2Mg
2(SO
4)
3 		507.73 made 3.367[37] 10.0051[38] 1.556[38]
Cs
2Mg
2(SO
4)
3 		602.61 no compound[10]
(NH
4)
2Mg
2(SO
4)
3 		372.87 Efremovite[39] 241[40] 220[40] 2.49[41] 9.979[41]
Tl
2Mg
2(SO
4)
3 		745.56 ≥3 phase 227.8[40] 330.8[40]
K
2CaMg(SO
4)
3 		430.77 made 2.723[42] 10.1662[42] 1.525[42]
K
2Ca
2(SO
4)
3 		446.54 4 phases [43][44] 457 2.69 2.683[45] 10.429Å a=10.334 b=10.501 c=10.186 Nα=1.522 Nβ=1.526 Nγ=1.527
Rb
2Ca
2(SO
4)
3 		539.28 2 phases 183 3.034[46] 10.5687[46] 1.520[46]
Cs
2Ca
2(SO
4)
3 		634.15 3.417[47][48] 10.7213 1.549
Tl
2Ca
2(SO
4)
3 		no compound[10]
(NH
4)
2Ca
2(SO
4)
3 		404.42 made 158 2.297[49] 10.5360[50] 1.532[50]
(NH
4)
2V
2(SO
4)
3 		colour clear green[51] 2.76[52] 10.089[51]
K
2Mn
2(SO
4)
3 		476.26 manganolangbeinite[53]
2 phases
pale pink[54] 		191 3.02[35] 10.014[35]
(orthorhombic)
a=10.081, b=10.108, c=10.048 Å[55] 		1.576[54]
Rb
2Mn
2(SO
4)
3 		569 made[56] 3.546[57] 10.2147[57] 1.590[57]
Cs
2Mn
2(SO
4)
3 		663.87 predicted[10]
(NH
4)
2Mn
2(SO
4)
2 		434.14 made 2.72[41] 10.1908[58]
Tl
2Mn
2(SO
4)
3 		806.83 made 5.015[59] 10.2236[59] 1.722[59]
K
2Fe
2(SO
4)
3 		478.07 made ?130
Rb
2Fe
2(SO
4)
3 		predicted[10]
Tl
2Fe
2(SO
4)
3 		808.64 exists[10]
(NH
4)
2Fe
2(SO
4)
3[51] 		435.95 mineral 2.84[41] 10.068[41] 1.574[60]
K
2Co
2(SO
4)
3 		484.25 2 phases
deep purple 		126 3.280[34] 9.9313[35] 1.608[61]
Rb
2Co
2(SO
4)
3 		576.99 made 3.807[62] 10.0204[62] 1.602[62]
Cs
2Co
2(SO
4)
3 		671.87
(NH
4)
2Co
2(SO
4)
3 		442.13 made 2.94[41] 9.997[41]
Tl
2Co
2(SO
4)
3 		813.82 made 5.361[63] 10.0312 1.775
K
2Ni
2(SO
4)
3 		483.77 made[64] light greenish yellow[65] 3.369[34] 9.8436[65] 1.620[65]
Rb
2Ni
2(SO
4)
3 		576.51 made 3.921[66] 9.9217[66] 1.636[66]
Cs
2Ni
2(SO
4)
3 		671.39 predicted[10]
(NH
4)
2Ni
2(SO
4)
3 		441.65 made[64] 160 3.02[41] 9.904[41]
Tl
2Ni
2(SO
4)
3 		814.34 predicted[10]
Rb
2Cu
2(S
04)
3 		predicted[10]
Cs
2Cu
2(S
04)
3 		predict not[10]
Tl
2Cu
2(S
04)
3 		predicted[10]
K
2Zn
2(SO
4)
3 		497.1 4 phases 75 138 3.376[34] 9.9247[67] 1.592[67]
Rb
2Zn
2(S
04)
3 		predicted[10]
Cs
2Zn
2(S
04)
3 		predict not[10]
Tl
2Zn
2(S
04)
3 		predicted[10]
K
2Cd
2(SO
4)
3 		591.21 2 phases 432 2.615 3.677[68] a=10.212 b=10.280 c=10.171 Nα=1.588 Nγ=1.592
Rb
2Cd
2(SO
4)
3 		683.95 4 phases 66 103 129 4.060[35][69] 10.3810[35][69] 1.590[69]
(NH
4)
2Cd
2(SO
4)
3 		549.09 4 phases 95 3.288[35] 10.3511[35]
Tl
2Cd
2(SO
4)
3 		921.78 4 phases 92 120 132 5.467[35] 10.3841[35] 1.730[70]

Fluoroberyllates[]

Properties of langbeinites with fluoroberyllate (BeF2−
4) anion
Formula Weight (g/mol) Cell size (Å) Volume Density Comment
K
2Mn
2(BeF
4)
3[11] 		4 phases transition at 213
K
2Mg
2(BeF
4)
3[71] 		9.875 962.8 1.59
(NH
4)
2Mg
2(BeF
4)
3[71] 		9.968 1.37
KRbMg
2(BeF
4)
3[71] 		9.933 1.72
Rb
2Mg
2(BeF
4)
3[71] 		9.971 1.91
Tl
2Mg
2(BeF
4)
3[71] 		9.997 2.85
K
2Ni
2(BeF
4)
3[71] 		9.888 1.86
Rb
2Ni
2(BeF
4)
3[71] 		9.974 2.19
Tl
2Ni
2(BeF
4)
3[71] 		9.993 3.13
K
2Co
2(BeF
4)
3[71] 		9.963 988 1.82
(NH
4)
2Co
2(BeF
4)
3[71] 		10.052 1.61
Rb
2Co
2(BeF
4)
3[71] 		10.061 2.14
Tl
2Co
2(BeF
4)
3[71] 		10.078 3.05
RbCsCo
2(BeF
4)
3[71] 		10.115 2.28
K
2Zn
2(BeF
4)
3[71] 		9.932 1.89
(NH
4)Zn
2(BeF
4)
3[71] 		10.036 1.67
Rb
2Zn
2(BeF
4)
3[71] 		10.035 2.20
Tl
2Zn
2(BeF
4)
3[71] 		10.060 3.14
RbCsZn
2(BeF
4)
3[71] 		10.102 2.36
K
2Mn
2(BeF
4)
3[71] 		10.102 1.72
KRbMn
2(BeF
4)
3[71] 		10.187 1.82
(NH
4)
2Mn
2(BeF
4)
3[71] 		10.217 1.50
Rb
2Mn
2(BeF
4)
3[71] 		10.243 2.00
Tl
2Mn
2(BeF
4)
3[71] 		10.255 2.87
RbCsMn
2(BeF
4)
3[71] 		10.327 2.12
Cs
2Mn
2(BeF
4)
3[71] 		10.376 2.26
K
2MnCd(BeF
4)
3[71] 		10.133 1.92
KRbMnCd(BeF
4)
3[71] 		10.220 2.04
Rb
2MnCd(BeF
4)
3[71] 		10.133 1.92
RbCsMnCd(BeF
4)
3[71] 		10.380 2.28
Cs
2MnCd(BeF
4)
3[71] 		10.451 2.41
(NH
4)
2Cd
2(BeF
4)
3[71] 		10.342 1.87
Rb
2Cd
2(BeF
4)
3[71] 		10.385 2.32
Tl
2Cd
2(BeF
4)
3[71] 		10.402 3.16
RbCsCd
2(BeF
4)
3[71] 		10.474 2.43
Cs
2Cd
2(BeF
4)
3[71] 		10.558 2.53
RbCsCdCa(BeF
4)
3[71] 		10.501 2.15
Rb
2Ca
2(BeF
4)
3[71] 		10.480 1.74
RbCsCa
2(BeF
4)
3[71] 		10.583 1.86
Cs
2Ca
2(BeF
4)
3[71] 		10.672 1.98
Cs
2Mg
2(BeF
4)
3 		does not exist[71]

Phosphates[]

Properties of langbeinites with phosphate (PO2−
4) anion
Formula Weight (g/mol) Cell size (Å) Density Comment
LiCs
2Y
2(PO
4)
3[72] 		735.48 10.5945 4.108
LiRb
2Y
2(PO
4)
3[73] 		non-linear optical
K
2YTi(PO
4)
3[1] 		578.25 10.1053 3.192
K
2ErTi(PO
4)
3[1] 		584.03 10.094 3.722
K
2YbTi(PO
4)
3[1] 		499.89 10.1318 3.772
K
2CrTi(PO
4)
3[1] 		462.98 9.8001 3.267
(NH
4)(H
3O)TiIII
TiIV
(PO
4)
3[74] 		417.71 9.9384
K
2Ti
2(PO
4)
3[75] 		458.84 9.8688 Also K
2-x; dark blue
Rb
2Ti
2(PO
4)
3[75] 		551.58 9.9115
Tl
2Ti
2(PO
4)
3[75] 		789.41 9.9386
Na
2FeTi(PO
4)
3[76] 		9.837
Na
2CrTi(PO
4)
3[76] 		9.775
K
2Mn
0.5Ti
1.5(PO
4)
3[77] 		9.903 3.162 dark brown
K
2Co
0.5Ti
1.5(PO
4)
3[77] 		9.844 3.233 dark brown
Rb
4NiTi
3(PO
4)
6[78] 		1113.99÷2 9.9386
K
2AlTi(PO
4)
3[79] 		437.96 9.7641 3.125 colourless
K2TiYb(PO4)3[80]
Li
2Zr
2(PO
4)
3[81] 		481.24
K
2(Ce, ..., Lu)Zr(PO
4)
3[82] 		594.45...629.3 10.29668
Rb
2FeZr(PO
4)
3[83] 		602.92 10.1199
K
2FeZr(PO
4)
3[84] 		510.18 10.0554 dark grey Note Na
2FeZr(PO
4)
3 is not a langbeinite.[85]
K
2YZr(PO
4)
3[86] 		543.24 10.3346 random Y and Zr
K
2GdZr(PO
4)
3[86] 		611.58 10.3457 random Gd and Zr
K
2YHf(PO
4)
3[87] 		630.51 10.3075 3.824
Li(H
2O)
2Hf
2(PO
4)
3[88] 		684.87 10.1993
K
2BiHf(PO
4)
3[89] 		750.58
Li(H
2O)
2Zr
2(PO
4)
3[81] 		510.33 10.2417
K
2AlSn(PO
4)
3 		508.78 9.798[13]
K
2CrSn(PO
4)
3 		9.8741[citation needed]
K
2InSn(PO
4)
3 		10.0460[citation needed]
K
2FeSn(PO
4)
3 		9.921[citation needed]
K
2YbSn(PO
4)
3 		10.150[citation needed]
K
4Al
3Ta(PO
4)
6[90] 		988.11 9.7262
K
4Cr
3Ta(PO
4)
6[90] 		1063.16 9.8315
K
4Fe
3Ta(PO
4)
6[90] 		1074.70 9.9092
K
4Tb
3Ta(PO
4)
6 		10.3262[91]
K
4Fe
3Nb(PO
4)
6[90] 		986.66 9.9092
KBaEr
2(PO
4)
3[92] 		795.857
RbBaEr
2(PO
4)
3[92] 		842.227
CsBaEr
2(PO
4)
3[92] 		889.665
(Rb,Cs)
2(Pr,Er)Zr(PO
4)
3[92]
KCsFeZrP
3O
12 		603.99 10.103[93]
CaFe
3O(PO
4)
3[94] 		508.53
SrFe
3O(PO
4)
3[94] 		556.1
PbFe
3O(PO
4)
3[94] 		675.6
KSrFe
2(PO
4)
3[95] 		523.32 9.809 3.68 yellowish
Pb
1.5VIV

2(PO
4)
3 		697.6 9.7818 4.912[96]
K
2TiV(PO
4)[97] 		9.855 green
BaTiV(PO
4)[97] 		9.922 3.54 at high temperature > 950 °C dark grey
KBaV
2(PO
4)[97] 		9.873 greenish yellow
Ba
1.5V
2(PO
4)[97] 		9.884 grey
Ba
1.5Fe3+

2(PO
4)
3[98][99] 		602.59
KSrSc
2(PO
4)
3[100] 		501.54
Rb
0.743K
0.845Co
0.293Ti
1.707(PO
4)
3[101] 		9.8527
K
2BiZr(PO
4)
6[102] 		663.32 10.3036
KBaSc
2(PO
4)
3[103] 		503.25
KBaRZrP
2SiO
12[2] 		R = La, Nd, Sm, Eu, Gd, Dy, Y
KBaYSnP
2SiO
12[2] 		666.07
KBaFe
2(PO
4)
3[104] 		525.03 9.8732 (at 4 K)
KBaCr
2(PO
4)
3[105] 		517.33 9.7890
Rb
2FeTi(PO
4)
3[106] 		511.56 9.8892 Na
2FeTi(PO
4)
3 has NZP structure[85]
KBaMgTi(PO
4)
3[107] 		485.51 9.914 KSrMgTi crystallises in kosnarite form
KPbMgTi(PO
4)
3[107] 		555.39 9.8540 KSrMgTi in kosnarite form
RbBaMgTi(PO
4)
3[107] 		9.954 531.88 CsBa does not form
RbPbMgTi(PO
4)
3[107] 		601.76 9.9090 CsPb does not form
KSrMgZr(PO
4)
3[107] 		479.16 10.165
KPbMgZr(PO
4)
3[107] 		598.74 10.111
KBaMgZr(PO
4)
3[107] 		528.87 10.106
RbSrMgZr(PO
4)
3[107] 		525.53 10.218
RbPbMgZr(PO
4)
3[107] 		645.11 10.178
RbBaMgZr(PO
4)
3[107] 		575.24 10.178
CsSrMgZr(PO
4)
3[107] 		572.97 10.561 over 1250 °C forms kosnarite phase
Ba
3In
4(PO
4)
6[108] 		10.1129
Ba
3V
4(PO
4)
6[109] 		1185.58 9.8825 4.08 yellow-green
KPbCr
2(PO
4)
3[110] 		9.7332
KPbFe
2(PO
4)
3[110] 		9.8325 beige
K
4NiHf
3(PO
4)
6[111] 		660.192 (half) 10.12201 4.228 yellow

Phosphate silicates[]

substance formula weight unit cell edge Å density comment
K2Sn2(PO4)2SiO4[112] Stable to 650 °C
K2Zr2(PO4)2SiO4[112] Stable to 1000 °C
Cs2Zr2(PO4)2SiO4[113]
CsKZr2(PO4)2SiO4[113]

Vanadates[]

The orthovanadates have four formula per cell, with a slightly distorted cell that has orthorhombic symmetry.

formula weight comment Cell dimensions Å Volume density refractive
Formula g/mol symmetries a b c index
LiBaCr
2(VO
4)
3[114] 		593.08 Orthorhombic 9.98 10.52 9.51 998 4.02
NaBaCr
2(VO
4)
3[114] 		609.13 Orthorhombic 9.99 10.52 9.53 1002 4.09
AgBaCr
2(VO
4)
3[114] 		694.00 Orthorhombic 10.02 10.53 9.53 1005 4.62

Arsenates[]

substance formula weight unit cell edge Å density
K
2ScSn(AsO
4)
3[115] 		658.62 10.3927
Zr
2NH
4(AsO
4)
3·H2O[116] 		632.558 10.532 3.379

Selenates[]

Langbeinite structured double selenates are difficult to make, perhaps because selenate ions arranged around the dication leave space for water, so hydrates crystallise from double selenate solutions. For example, when ammonia selenate and cadmium selenate solution is crystallized it forms diammonium dicadmium selenate trihydrate: (NH
4)
2Cd
2(SeO
4)
3·3H2O and when heated it loses both water and ammonia to form a rather than a langbeinite.[117]

substance formula weight unit cell edge Å density note
(NH
4)
2Mn
2(SeO
4)
3[118] 		574.83 10.53 3.26 forms continuous series with SO
4 too

Molybdates[]

substance formula weight unit cell edge Å density
Cs
2Cd
2(MoO
4)
3[119] 		970.5 11.239
Rb
2Co
2(MoO
4)
3 		768.7
Cs
2Co
2(MoO
4)
3[120]
Cs
2Ni
2(MoO
4)
3[121] 		863.01 10.7538
(H
3O)
2Mn
2(MoO
4)
3[122] 		627.75 10.8713
K
2Mn
2(MoO
4)
3[123]

Tungstates[]

substance formula weight unit cell edge Å density
Rb
2Mg
2(WO
4)
3[124] 		963.06 10.766
Cs
2Mg
2(WO
4)
3[124] 		1057.93 10.878

Preparation[]

Diammonium dicadmium sulfate can be made by evaporating a solution of ammonium sulfate and cadmium sulfate.[19] Dithallium dicadmium sulfate can be made by evaporating a water solution at 85 °C.[22] Other substances may be formed during crystallisation from water such as Tutton's salts or competing compounds like Rb
2Cd
3(SO
4)
4·5H2O.[125]

Potassium and ammonium nickel langbeinite can be made from nickel sulfate and the other sulfates by evaporating a water solution at 85 °C.[64]

Dipotassium dizinc sulfate can be formed into large crystals by melting zinc sulfate and potassium sulfate together at 753 K. A crystal can be slowly drawn out of the melt from a rotating crucible at about 1.2 mm every hour.[126]

Li(H
2O)
2Hf
2(PO
4)
3 can be made by heating HfCl
4, Li
2B
4O
7, H
3PO
4, water and hydrochloric acid to 180 °C for eight days under pressure.[88] Li(H
2O)
2Hf
2(PO
4)
3 converts to Li
2Hf
2(PO
4)
3 on heating to 200 °C.[81]

The sol-gel method produces a gel from a solution mixture, which is then heated. Rb
2FeZr(PO
4)
3 can be made by mixing solutions of FeCl
3, RbCl, ZrOCl
2, and dripping in H
3PO
4. The gel produced was dried out at 95 °C and then baked at various temperatures from 400 to 1100 °C.[83]

Langbeinites crystals can be made by the Bridgman technique, Czochralski process or flux technique.

A Tutton's salt may be heat treated and dehydrate, e.g. (NH
4)
2Mn
2(SeO
4)
3 can be made from (NH
4)
2Mn(SeO
4)
3·6(H
2O) heated to 100 °C, forming (NH
4)
2(SeO
4) as a side product.[127] Similarly the ammonium vanadium Tutton's salt, (NH
4)
2V(SO
4)
2, heated to 160 °C in a closed tube produces (NH
4)
2V
2(SO
4)
3. At lower temperatures a hydroxy compound is formed.[51]

Use[]

Few uses have been made of these substances. Langbeinite itself can be used as an "organic" fertiliser with potassium, magnesium and sulfur, all needed for plant growth. Electrooptic devices could be made from some of these crystals, particularly those that have cubic transition temperatures as temperatures above room temperature. Research continues into this. Ferroelectric crystals could store information in the location of domain walls.

The phosphate langbeinites are insoluble, stable against heat, and can accommodate a large number of different ions, and have been considered for immobilizing unwanted radioactive waste.[128]

Zirconium phosphate langbeinites containing rare earth metals have been investigated for use in white LEDs and plasma displays.[102] Langbeinites that contain bismuth are photoluminescent.[102] In case of iron-containing ones complex magnetic behavior may be found.[129]

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