&CONTROL                                                                      
                     title = 'SiO2',                                    
               calculation = 'vc-relax' ,                                      
               max_seconds = 84000 ,                                           
              restart_mode = 'from_scratch' ,                                  
                    outdir = './OUT',
                pseudo_dir = './',               
                    prefix = 'SiO2' ,
             etot_conv_thr = 1.0d-5 ,                                          
             forc_conv_thr = 1.0d-4 ,                                          
                   tstress = .true. ,                                          
                   tprnfor = .true. ,
		        dt = 80                              
 /                                                                             
 &SYSTEM                                                                       
                     ibrav =  0 ,
                 celldm(1) =  7.977062339 ,
!                 celldm(3) =  0.636535023,
                       nat = 6 ,                                              
                      ntyp = 2 ,                                               
                   ecutwfc = 30 ,                                              
                   ecutrho = 330 ,                                             
                occupations = 'fixed',
!               occupations = 'smearing' ,
!                  smearing = 'methfessel-paxton',                              
!                 degauss = 0.01                                              
 /                                                                             
 &ELECTRONS                                                                    
               mixing_beta = 0.5 ,                                             
           diagonalization = 'david' ,                                         
            diago_thr_init = 1.D-2 ,                                           
          diago_david_ndim = 10                                                
 /                                                                             
 &IONS                                                                         
 / 
 &CELL
             cell_dynamics = 'damp-w',
                     press = 00.D0 ,
	             wmass = 0.01
/
CELL_PARAMETERS { alat  }                                    
1.00 0.00 0.00
0.00 1.00 0.00
0.00 0.00 0.636535023
ATOMIC_SPECIES                                                                 
    Si  28.0855   Si.pw91-n-van.UPF                                         
    O   15.9994    O.pw91-van_ak.UPF                                           
ATOMIC_POSITIONS (crystal)                                                     
Si   0.00000000  0.00000000  0.00000000
Si   0.50000000  0.50000000  0.50000000
O   0.30657944  0.30657944  0.00000000
O   0.69342056  0.69342056  0.00000000
O   0.19342056  0.80657944  0.50000000
O   0.80657944  0.19342056  0.50000000
K_POINTS automatic                                                             
 10 10 10 1 1 1