Table of Abbreviations, Acronyms, and Symbols

a, b, c, , ,	lattice constants and angles
A	hydrogen acceptor of the hydrogen bond
Å	Ångstrom, 10 pm, 10-10 m
aq	aqueous
avg.	average
calcd	calculated
Cs/NH4	Cs3(NH4)2(HPO3F)3(PO3F)2
½D + ½A	½ hydrogen donor and ½ hydrogen acceptor
d	bond length
D	hydrogen donor of the hydrogen bond
Diet	diethyl ammonium hydrogen monofluorophosphate
di or disd	disordered
DTA	differential thermal analysis
DTG	differential thermogravimetric analysis
Et	ethyl group, -CH2CH3
EtOH	ethanol
Et2O	diethyl ether
GooF	goodness of fit defined as GooF = S ={[w(Fo2 - Fc2)2]/(n-p)}½
(H)PO3F	hydrogen monofluorophosphate or monofluorophosphate
H(H)PO3F	hydrogen atom of OH group in the (H)PO3F tetrahedron
HN	hydrogen atom on nitrogen
IC	ion current
M	Na+, K+, Rb+, Cs+, or NH4+, unless otherwise defined
Me	methyl group, -CH3
med	medium
MeOH	methanol
Na/[NMe4]	Na5[NMe4](PO3F)3·18H2O
N,N´-dmu	N,N´-dimethyl urea
N,N´-dmuH+	N,N´-dimethyl uronium cation, {HOC[NH(CH3)]2}+
OA	hydrogen acceptor oxygen atom
Occ.	occupancy
OD	hydrogen donor oxygen atom
Ow	oxyge. atom of crystal water
O(w)	oxygen atom of crystal water or (H)PO3F tetrahedron
PE	polyethylene
PipzH22+	piperazinium cation, [NH2(CH2CH2)2NH2]2+
Pipz	piperazinium hydrogen monofluorophosphate
PTA	pulse thermal analysis
R1	residual factor defined as R1 = \|[boxv ]\||Fobs| - |Fcalc|\|[boxv ]\|/|Fobs|
RT	room temperature
Sect.	section
STA	simultaneous thermal analysis (DG, DTA, TG)
TG	thermogravimetry
wR2	residual factor defined as wR2 = {[w(Fo2 - Fc2)2]/[w(Fo2)2]}½
V	unit cell volume
VF	total fluorine bond valency
X	oxygen or fluorine atom, unless defined otherwise
XRD	X-ray powder diffraction
Z	number of formula units in the cell
µ	absorption coefficient
calc	density, calculated
	bond angle

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