data_3000010 loop_ _publ_author_name 'Armel Le Bail' 'Thomas Hansen' 'Wilson A. Crichton' 'Andrew N. Fitch' _publ_section_title ; Tetrapotassium pyrophosphates gamma and delta-K4P2O7 ; _journal_name_full 'To be published in Powder Diffraction' _diffrn_ambient_temperature 293 _cell_measurement_temperature 293 _chemical_name_common 'tetrapotassium pyrophosphate' _chemical_formula_sum 'K4 O7 P2' _cell_length_a 10.21145(7) _cell_length_b 10.21145(7) _cell_length_c 42.6958(4) _cell_angle_alpha 90.00000 _cell_angle_beta 90.00000 _cell_angle_gamma 120.00000 _cell_volume 3855.59(5) _refine_ls_r_i_factor 3.25 _cod_hold_until_date 2012-09-30 loop_ _atom_site_label _atom_site_fract_x _atom_site_fract_y _atom_site_fract_z ? ? ? ?